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Climate influence seed production in managed and unmanaged Nothofagus pumilio forests of Southern Patagonia 气候对巴塔哥尼亚南部有管理和无管理 Nothofagus pumilio 森林种子生产的影响
IF 1.5 4区 农林科学 Q2 FORESTRY Pub Date : 2024-07-24 DOI: 10.33494/nzjfs542024x295x
Julián Rodríguez-Souilla, J. M. Cellini, F. Roig, María Vanessa Lencinas, J. Chaves, P. L. Peri, G. M. Martínez Pastur
Background: Annual seed production is key to understand natural forest dynamics and to apply sustainable forest management. This process is subjected to variations according to annual and seasonal climatic conditions, locally affected by El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) seasonality. Recognising how these variables affect the dynamics of harvested forests is useful for developing forest management strategies. Therefore, the objective of this study was to analyse annual seed production (SP) in Nothofagus pumilio (Poepp. & Endl.) Krasser stands harvested under variable retention and unmanaged primary forests in Tierra del Fuego, Argentina, related to the occurrence of climatic events over a 17-year period (2006-2022).Methods: Seed production (million ha-1 year-1) was annually measured in three managed stands with different retention levels (AR: aggregates; DRI: dispersed with aggregate protection; DR: dispersed without aggregate protection) and three primary forests (PF) stands as control sites (4 treatments x 3 areas x 6 replicates x 17 years). Values of occurrences of climatic events (positive or negative values of ENSO and SAM) were related to monthly temperature and rainfall. ANOVAs, correlation analyses and statistical modelling were performed to predict SP based on climatic variables and forest treatments.Results: Seed production varied over years and among forest treatments depending on annual climate variations, with annual averages for the studied period of: 9.35 million ha-1 year-1 for PF, 7.16 million ha-1 year-1 for AR, 2.25 million ha-1 year-1 for DRI and 1.08 million ha-1 year-1 for DR. ENSO+ and SAM+ acted as a trigger of high SP, associated to higher temperatures and dry conditions, mainly during spring and summer. The models predicted SP explaining 73-85% of its variability, considering minimum and maximum temperatures and ENSO mean values as better predictors.Conclusions: Findings presented in this study have important implications for forest management as a tool for understanding forest dynamics related to seeding, a key factor for forest regeneration in a context of high climate variability. However, within a context of climate change with extreme events, there is a need for long-term monitoring of seeding processes in Nothofagus forests. 
背景:每年的种子生产是了解自然森林动态和实施可持续森林管理的关键。这一过程受年度和季节性气候条件的影响而变化,局部地区受厄尔尼诺-南方涛动(ENSO)和南环模式(SAM)季节性的影响。了解这些变量如何影响采伐森林的动态变化有助于制定森林管理策略。因此,本研究的目的是分析阿根廷火地岛在可变保留率条件下采伐的 Nothofagus pumilio (Poepp. & Endl.) Krasser 林分的种子年产量(SP)与 17 年间(2006-2022 年)气候事件发生的关系:方法:每年在三个不同保留水平的管理林分(AR:聚合;DRI:有聚合保护的分散;DR:无聚合保护的分散)和三个原始森林(PF)林分(4 个处理 x 3 个区域 x 6 个重复 x 17 年)中测量种子产量(百万公顷-1 年-1)。气候事件发生值(厄尔尼诺/南方涛动和 SAM 的正值或负值)与月气温和降雨量相关。通过方差分析、相关性分析和统计建模来预测基于气候变量和森林处理的种子产量:种子产量随年份和森林处理的不同而变化,这取决于年度气候的变化:PF为935万公顷/年,AR为716万公顷/年,DRI为225万公顷/年,DR为108万公顷/年。厄尔尼诺/南方涛动+和萨米+是高 SP 的触发因素,与较高的温度和干燥条件有关,主要发生在春季和夏季。模型对 SP 的预测解释了其 73-85% 的变化,认为最低和最高温度以及厄尔尼诺/南方涛动平均值是更好的预测因素:本研究的结果对森林管理具有重要意义,因为它是了解与播种有关的森林动态的工具,而播种是气候多变背景下森林再生的关键因素。然而,在极端事件频发的气候变化背景下,有必要对Nothofagus森林的播种过程进行长期监测。
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引用次数: 0
Assessing the impacts of experimental mid-rotation forest fertiliser treatments on water quality 评估试验性中期轮伐森林肥料处理对水质的影响
IF 1.5 4区 农林科学 Q2 FORESTRY Pub Date : 2024-07-21 DOI: 10.33494/nzjfs542024x356x
B. Baillie, J. Elleouet, Graham W. R. Coker
Background: Planted forests face on-going challenges to increase productivity while remaining within sustainable limits. Forest management activities that potentially impact on water quality are under increasing public scrutiny and regulatory controls. New Zealand’s forest industry is experimenting with aerially applied, mid-rotation fertiliser treatments as a sustainable option to increase productivity from planted forests. However, the effect of such applications on water quality requires investigation.Methods: Field trials were established to assess the effects of two conventional fertiliser applications (either granular di-ammonium phosphate (DAP) or granular urea) and a new-to-forestry liquid foliar fertiliser blend, on nitrogen and phosphorus concentrations in stream water of three planted forest sites representing a range of New Zealand climatic and soil environments.Results: Overall, the liquid foliar fertiliser treatment had the least impact on water quality compared with the two conventional fertiliser treatments. On the day of fertiliser application, when compared with pre-treatment in-stream concentrations, the urea treatments resulted in short-term increases in total nitrogen. The DAP treatment increased total phosphorus and dissolved reactive phosphorus concentrations with peak concentrations declining within hours. In the post-application period, any increases in nutrient concentrations in stream water were mainly associated with rainfall events within six months of application and at one site, the resumption of stream flow following a dry spell. Riparian ‘no-spray’ buffers of varying widths assisted in mediating the impacts of fertiliser applications.Conclusions: Initial evidence from these trials indicates that mid-rotation fertiliser treatments have the potential to provide an alternate management option to increase forest productivity or disease resilience with minimal or only short-term effects to water quality. However, further research on their environmental effects would support the development of guidelines specific to mid-rotation fertiliser applications, particularly if mid-rotation fertiliser applications become standard management practice in the forest industry.
背景:人造林在提高生产力的同时也面临着可持续发展的挑战。对水质有潜在影响的森林管理活动正受到越来越多的公众监督和监管控制。新西兰的森林产业正在尝试在轮伐中期进行航空施肥处理,作为提高人工林生产力的一种可持续选择。然而,这种施肥方法对水质的影响需要调查:方法:进行了实地试验,以评估两种常规施肥(颗粒状磷酸二铵(DAP)或颗粒状尿素)和一种新的森林液态叶面混合肥料对代表新西兰不同气候和土壤环境的三个人工林地点溪水中氮、磷浓度的影响:总的来说,与两种常规肥料处理相比,液体叶面肥处理对水质的影响最小。施肥当天,与处理前的水流浓度相比,尿素处理会导致总氮短期内增加。磷酸二铵处理增加了总磷和溶解性活性磷的浓度,峰值浓度在数小时内下降。施药后,溪水中养分浓度的增加主要与施药后 6 个月内的降雨事件有关,在一个地点还与干旱后溪水恢复流动有关。不同宽度的河岸 "无喷洒 "缓冲区有助于减轻施肥的影响:这些试验的初步证据表明,轮伐中期施肥有可能为提高森林生产力或抗病能力提供另一种管理选择,而对水质的影响极小或仅有短期影响。然而,对其环境影响的进一步研究将有助于制定专门针对中耕施肥的指导原则,尤其是在中耕施肥成为林业标准管理做法的情况下。
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引用次数: 0
Mid-term results and prospects for irregular shelterwood systems in hardwood-dominated temperate rainforests in Chile 智利以硬木为主的温带雨林中不规则防护林系统的中期成果和前景
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-04-19 DOI: 10.33494/nzjfs542024x323x
Pablo J. Donoso, Tomás Riquelme-Buitano, Daniel P. Soto
Background: When possible, silviculture should aim to develop mixed-species multi-aged forests that can be more productive and resilient to disturbances, provide high-quality timber and sustain greater amounts of biomass. Southern Chile is covered by temperate rainforests dominated by a mixture of tree species, such as the Evergreen forest type (EFT). The irregular shelterwood regeneration method is a novel approach aimed at developing irregular multi-aged forests following the retention of the residual forest (no final cut). Here, we report mid-term results after implementing these cuttings in two EFT forests in the Coastal Range and discuss its prospects for other temperate rainforests.Methods: Two forests were sampled and evaluated in terms of composition, structure and growth, focusing on the new cohorts developed or released after the irregular shelterwood cuts. One forest was cut in a low-productivity site at 600 m (Hueicolla) in 1983, and the other in a medium-productivity site at 350 m (Llancahue) in 2009. In Hueicolla, 63% of the basal area was harvested from an old-growth forest where the main residual tree species were Eucryphia cordifolia, Laureliopsis philippiana and Saxegothaea conspicua. In Llancahue, 40% of the total basal area was harvested in a mature secondary forest dominated by Nothofagus dombeyi.Results: The understorey developed in Hueicolla had 3,600 trees per ha and a quadratic stand diameter of 15 cm. It was dominated by the mid-tolerant species Eucryphia cordifolia, Gevuina avellana and Lomatia ferruginea, plus the shade-tolerant Amomyrtus luma. In Llancahue, a dense lower canopy was dominated by Podocarpus salignus and Drimys winteri, both mid-tolerant species, which included 81,000 seedlings and saplings < 5 cm per hectare and 560 ingrowth 5-10 cm trees per hectare.Conclusions: The irregular shelterwood cuts allowed the development of dense understorey tree layers below the residual trees. However, the tree composition of the new cohorts largely differed from that of the residual trees and was dominated by mid-tolerant species, including some short-lived species. The irregular shelterwood method proves appropriate for the EFT and may likely be successful in other forest types with valuable mid-tolerant species.
背景:在可能的情况下,造林的目的应该是发展多树种混交的多树龄森林,这样的森林产量更高,抗干扰能力更强,能提供优质木材并维持更多的生物量。智利南部覆盖着以混合树种为主的温带雨林,如常绿林类型(EFT)。不规则防护林再生法是一种新颖的方法,旨在通过保留残余森林(无最终砍伐)来发展不规则的多树龄森林。在此,我们报告了在沿海山脉的两片 EFT 森林中实施这些砍伐后的中期结果,并讨论了其在其他温带雨林中的应用前景:方法:我们对两片森林进行了取样,并对其组成、结构和生长情况进行了评估,重点是不规则砍伐防护林后形成或释放的新群落。其中一片森林于 1983 年在海拔 600 米的低生产力地区(Hueicolla)砍伐,另一片于 2009 年在海拔 350 米的中等生产力地区(Llancahue)砍伐。在 Hueicolla,63% 的基部面积是从一片古老的森林中采伐的,那里的主要残留树种是 Eucryphia cordifolia、Laureliopsis philippiana 和 Saxegothaea conspicua。在 Llancahue,在一片以 Nothofagus dombeyi 为主的成熟次生林中采伐了总基部面积的 40%:在 Hueicolla 开发的林下植被每公顷有 3,600 棵树,林木的二次方直径为 15 厘米。林下主要是中等耐阴树种 Eucryphia cordifolia、Gevuina avellana 和 Lomatia ferruginea,以及耐阴树种 Amomyrtus luma。在 Llancahue,茂密的下层树冠以 Podocarpus salignus 和 Drimys winteri 为主,这两种植物都是中耐寒树种,其中包括每公顷 81,000 株小于 5 厘米的幼苗和树苗,以及每公顷 560 株 5-10 厘米的新生树木:结论:不规则的防护林砍伐使残留树木下方形成了茂密的林下树层。然而,新树群的树种组成与残留树木的树种组成有很大不同,主要是中耐寒树种,包括一些寿命较短的树种。事实证明,不规则防护林方法适用于 EFT,并有可能在具有珍贵中耐寒树种的其他森林类型中取得成功。
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引用次数: 0
Use of nitrogen-fixing plants to improve planted forest soil fertility and productivity in New Zealand: A review 利用固氮植物提高新西兰人工林土壤肥力和生产力:综述
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-04-18 DOI: 10.33494/nzjfs542024x329x
Nicola M. Reid, Kathryn Wigley, Aysha Nusrath, S. Smaill, L. Garrett
Background: Planted forests with low fertility soils are likely to require increased inputs of nitrogen (N) to satisfy increasing productivity demands. The use of N fertilisers will become more challenging due to their increasing cost and the risk of unwanted environmental impacts. Nitrogen-fixing plants may provide an alternative option to chemical fertilisers that is not only cheaper but has a lower greenhouse gas footprint.Methods: Information on N-fixing plants was collated from available literature, focusing on species previously associated with planted forests as well as other exotic N-fixing trees and New Zealand native plants not used in commercial planted forests.Results: Benefits to planted forest growth in New Zealand by N-fixing plants have been proven in only a few cases. Lupinus arboreus Sims was used in the 1970s and 1980s to increase N inputs in a planted Pinus radiata D.Don coastal forest, and improved P. radiata productivity was demonstrated. Productivity gains ceased when a blight disease infected the lupin population. Many N-fixing plants have been shown to tolerate low fertility soils and establish in planted forests, but there is limited information on their N contribution to the soil, and whether this N contribution increases P. radiata productivity. Such N-fixing plants include Lotus species, clover (Trifolium species) and weeds such as gorse (Ulex europaeus L.) and broom (Cytisus scoparius (L.) Link), which are commonly found in association with P. radiata forests. New Zealand native N-fixing shrubs may be suitable but there is limited information available describing N-fixation or forestry management for native plant species.Conclusions: Nitrogen-fixing plants are a valuable resource, which when managed properly could be used for enhancing productivity. Issues with pests and disease, and limited knowledge regarding the management of N-fixing species, restricts adoption in planted forests. Well-designed research is needed to assess impacts on whole forest system N cycling as well as selection of appropriate plant species for use in planted forests without unintended consequences such as competition for soil moisture or light. This research needs to be integrated with forest management and delivered as practical options to ensure success.
背景:肥力低的人工林可能需要增加氮(N)的投入,以满足日益增长的生产力需求。由于氮肥的成本越来越高,而且有可能对环境造成不必要的影响,使用氮肥将变得更具挑战性。固氮植物可作为化肥的替代选择,不仅成本更低,而且温室气体足迹更小:方法:从现有文献中整理有关固氮植物的信息,重点关注以前与人工林相关的物种以及其他外来固氮树种和未用于商业人工林的新西兰本地植物:结果:固氮植物对新西兰人工林生长的益处仅在少数情况下得到证实。20 世纪 70 年代和 80 年代,Lupinus arboreus Sims 被用于增加人工种植的 Pinus radiata D.Don 沿海森林的氮输入量,并证明提高了 Pinus radiata 的生产力。当羽扇豆种群感染枯萎病后,生产力的提高就停止了。许多固氮植物已被证明能够耐受低肥力土壤并在人工林中生长,但关于它们对土壤的氮贡献以及这种氮贡献是否能提高黑松生产力的信息却很有限。这些固氮植物包括莲花品种、三叶草(Trifolium species)和杂草,如戈尔斯(Ulex europaeus L.)和扫帚(Cytisus scoparius (L.) Link),这些植物通常与辐射对称植物森林伴生。新西兰本地固氮灌木可能也适合种植,但关于本地植物物种的固氮作用或林业管理的资料有限:结论:固氮植物是一种宝贵的资源,如果管理得当,可用于提高生产力。病虫害问题以及固氮物种管理方面的知识有限,限制了人工林的采用。需要进行精心设计的研究,以评估对整个森林系统氮循环的影响,并选择适当的植物物种用于人工林,避免造成意外后果,如争夺土壤水分或光照。这项研究需要与森林管理相结合,并作为实用方案提供,以确保取得成功。
{"title":"Use of nitrogen-fixing plants to improve planted forest soil fertility and productivity in New Zealand: A review","authors":"Nicola M. Reid, Kathryn Wigley, Aysha Nusrath, S. Smaill, L. Garrett","doi":"10.33494/nzjfs542024x329x","DOIUrl":"https://doi.org/10.33494/nzjfs542024x329x","url":null,"abstract":"Background: Planted forests with low fertility soils are likely to require increased inputs of nitrogen (N) to satisfy increasing productivity demands. The use of N fertilisers will become more challenging due to their increasing cost and the risk of unwanted environmental impacts. Nitrogen-fixing plants may provide an alternative option to chemical fertilisers that is not only cheaper but has a lower greenhouse gas footprint.\u0000Methods: Information on N-fixing plants was collated from available literature, focusing on species previously associated with planted forests as well as other exotic N-fixing trees and New Zealand native plants not used in commercial planted forests.\u0000Results: Benefits to planted forest growth in New Zealand by N-fixing plants have been proven in only a few cases. Lupinus arboreus Sims was used in the 1970s and 1980s to increase N inputs in a planted Pinus radiata D.Don coastal forest, and improved P. radiata productivity was demonstrated. Productivity gains ceased when a blight disease infected the lupin population. Many N-fixing plants have been shown to tolerate low fertility soils and establish in planted forests, but there is limited information on their N contribution to the soil, and whether this N contribution increases P. radiata productivity. Such N-fixing plants include Lotus species, clover (Trifolium species) and weeds such as gorse (Ulex europaeus L.) and broom (Cytisus scoparius (L.) Link), which are commonly found in association with P. radiata forests. New Zealand native N-fixing shrubs may be suitable but there is limited information available describing N-fixation or forestry management for native plant species.\u0000Conclusions: Nitrogen-fixing plants are a valuable resource, which when managed properly could be used for enhancing productivity. Issues with pests and disease, and limited knowledge regarding the management of N-fixing species, restricts adoption in planted forests. Well-designed research is needed to assess impacts on whole forest system N cycling as well as selection of appropriate plant species for use in planted forests without unintended consequences such as competition for soil moisture or light. This research needs to be integrated with forest management and delivered as practical options to ensure success.","PeriodicalId":19172,"journal":{"name":"New Zealand Journal of Forestry Science","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140688782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diversity and growth patterns of woody species in the Mediterranean Coastal range of Chile: A case study in Altos de Cantillana 智利地中海沿岸地区木本物种的多样性和生长模式:坎蒂亚纳阿尔托斯案例研究
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-04-01 DOI: 10.33494/nzjfs542024x318x
Stephanie Gibson-Carpintero, Anahí Ocampo‐Melgar, Alejandro Venegas González
Background: The Altos de Cantillana mountain range (ACMR) in central Chile is composed of different vegetation communities, and is currently a priority site for conservation, due to its high endemism, high anthropogenic pressure and vulnerability to climate change. Research on biodiversity and carbon stocks in ACMR is essential to comprehend the resilience of these forests and to define conservation strategies. This study examines the spatial variability of biodiversity and tree biomass patterns along the entire altitudinal gradient of the ACMR.Methods: Six tree species communities were studied in Altos de Cantillana Nature Sanctuary, along an altitudinal gradient ranging from 415 to 2010 m. Woody species regeneration and inventory plots, as well as dendrochronological sampling in ~150 trees were carried out. Diversity patterns were analyzed using the Jaccard index and alpha index. Growth patterns of dominant trees species were analyzed by ring-width and trunk biomass chronologies, focusing on the recent megadrought period since 2010.Results: The forest inventory revealed a notable decline in alfa diversity patterns with increasing elevation. The moist sclerophyllous forest exhibited the highest diversity. However, we did not find a pattern between elevation and diversity (and abundance) at the seed regeneration inventory level. Additionally, we identified three clusters of woody species similarity: (i) sclerophyllous, shrubs and hygrophilous forest (<1,000 m.a.s.l.); (ii) high-elevation sclerophyllous forest (>1,500 m.a.s.l); and (iii) deciduous forests (~ 2,000 m.a.s.l). Furthermore, declining growth rates were observed in all communities studied beginning in the 1980s, with even a stronger reduction in radial growth (35% on average) and biomass accumulation (56% on average) when comparing the megadrought with six decades earlier.Conclusions: We concluded that there is a negative correlation between woody species diversity and elevation. However, there are no altitudinal patterns in seedling regeneration diversity and abundance, which puts the natural succession in ACMR at risk. Additionally, we have determined that the accumulation of trunk biomass in dominant woody species has been significantly impacted by the recent megadrought period. This has affected the sink capacity of forest communities in ACMR. Therefore, our findings can significantly contribute to more efficient and timely decision-making processes regarding the conservation and restoration of this globally unique ecosystem.
背景:智利中部的坎蒂亚纳高地山脉(ACMR)由不同的植被群落组成,由于其特有性高、人为压力大以及易受气候变化影响,目前已成为重点保护地区。对 ACMR 的生物多样性和碳储量进行研究,对于了解这些森林的恢复能力和确定保护战略至关重要。本研究考察了阿勒泰山脉整个海拔梯度上生物多样性和树木生物量模式的空间变异性:在 Altos de Cantillana 自然保护区,沿着从 415 米到 2010 米的海拔梯度,对六个树种群落进行了研究。使用 Jaccard 指数和阿尔法指数分析了多样性模式。通过年轮宽度和树干生物量年代学分析了主要树种的生长模式,重点关注 2010 年以来的近期大旱时期:森林资源调查显示,随着海拔的升高,α多样性模式明显下降。湿润硬叶林的多样性最高。然而,在种子再生清单层面,我们并未发现海拔高度与多样性(和丰度)之间的模式。此外,我们还发现了三个木质物种相似性集群:(i) 硬叶林、灌木林和滋润林(海拔 1,500 米);(iii) 落叶林(海拔约 2,000 米)。此外,从 20 世纪 80 年代开始,所研究的所有群落都出现了生长率下降的现象,与 60 年前的大旱相比,径向生长(平均 35%)和生物量积累(平均 56%)的下降幅度更大:结论:我们得出的结论是,木本物种多样性与海拔之间存在负相关。结论:我们得出结论认为,林木物种多样性与海拔呈负相关,但在幼苗再生多样性和丰度方面却没有海拔高度模式,这就给阿姆斯特丹热带雨林自然演替带来了风险。此外,我们还确定,主要木本物种树干生物量的积累受到近期特大干旱的严重影响。这影响了阿姆斯特丹地中海区域森林群落的吸收汇能力。因此,我们的研究结果将极大地促进有关保护和恢复这一全球独一无二的生态系统的更高效、更及时的决策过程。
{"title":"Diversity and growth patterns of woody species in the Mediterranean Coastal range of Chile: A case study in Altos de Cantillana","authors":"Stephanie Gibson-Carpintero, Anahí Ocampo‐Melgar, Alejandro Venegas González","doi":"10.33494/nzjfs542024x318x","DOIUrl":"https://doi.org/10.33494/nzjfs542024x318x","url":null,"abstract":"Background: The Altos de Cantillana mountain range (ACMR) in central Chile is composed of different vegetation communities, and is currently a priority site for conservation, due to its high endemism, high anthropogenic pressure and vulnerability to climate change. Research on biodiversity and carbon stocks in ACMR is essential to comprehend the resilience of these forests and to define conservation strategies. This study examines the spatial variability of biodiversity and tree biomass patterns along the entire altitudinal gradient of the ACMR.\u0000Methods: Six tree species communities were studied in Altos de Cantillana Nature Sanctuary, along an altitudinal gradient ranging from 415 to 2010 m. Woody species regeneration and inventory plots, as well as dendrochronological sampling in ~150 trees were carried out. Diversity patterns were analyzed using the Jaccard index and alpha index. Growth patterns of dominant trees species were analyzed by ring-width and trunk biomass chronologies, focusing on the recent megadrought period since 2010.\u0000Results: The forest inventory revealed a notable decline in alfa diversity patterns with increasing elevation. The moist sclerophyllous forest exhibited the highest diversity. However, we did not find a pattern between elevation and diversity (and abundance) at the seed regeneration inventory level. Additionally, we identified three clusters of woody species similarity: (i) sclerophyllous, shrubs and hygrophilous forest (<1,000 m.a.s.l.); (ii) high-elevation sclerophyllous forest (>1,500 m.a.s.l); and (iii) deciduous forests (~ 2,000 m.a.s.l). Furthermore, declining growth rates were observed in all communities studied beginning in the 1980s, with even a stronger reduction in radial growth (35% on average) and biomass accumulation (56% on average) when comparing the megadrought with six decades earlier.\u0000Conclusions: We concluded that there is a negative correlation between woody species diversity and elevation. However, there are no altitudinal patterns in seedling regeneration diversity and abundance, which puts the natural succession in ACMR at risk. Additionally, we have determined that the accumulation of trunk biomass in dominant woody species has been significantly impacted by the recent megadrought period. This has affected the sink capacity of forest communities in ACMR. Therefore, our findings can significantly contribute to more efficient and timely decision-making processes regarding the conservation and restoration of this globally unique ecosystem.","PeriodicalId":19172,"journal":{"name":"New Zealand Journal of Forestry Science","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140766425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seed thermo-priming accelerates the growth of Ceiba glaziovii (Kutze) K.Schum. seedlings 种子热预热可加速Ceiba glaziovii (Kutze) K.Schum.幼苗的生长
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-03-05 DOI: 10.33494/nzjfs542024x264x
José Laurindo dos Santos Júnior, Elizamar Ciríaco da Silva
Background: Global climate changes have caused temperature increases that can harm plant development, especially the initial growth and establishment of seedlings for the recovery of degraded areas. However, there are species in which these losses are attenuated when the seeds are thermo-primed to sublethal temperatures. Therefore, the objective of the present study was to evaluate the influence of seed heat conditioning on germination and initial growth of Ceiba glaziovii (Kuntze) K. Schum seedlings, an endemic species occurring in seasonally tropical dry forest in Brazil.Methods: Seeds of C. glaziovii were exposed to 70 oC for 15, 30, 45, 60 and 90 minutes as pre-germination treatments. The control did not undergo heat treatment. Germination variables, vegetative growth, survival rate and normal leaves were evaluated.Results: Thermo-priming negatively affected the germination proportion of C. glaziovii seeds with increasing exposure time. However, it significantly enhanced vegetative growth and seedling survival rate of this species after transplanting, without impairing the formation of normal leaves.Conclusions: Thermo-priming of seeds was found to produce more vigorous seedlings of Ceiba glaziovii.
背景:全球气候变化导致气温升高,会损害植物的生长发育,尤其是用于退化地区恢复的幼苗的初期生长和成活。然而,有些物种的种子在亚致死温度下进行热预处理后,这些损失会减小。因此,本研究的目的是评估种子热调节对巴西季节性热带干旱森林特有物种 Ceiba glaziovii (Kuntze) K. Schum幼苗萌发和初期生长的影响:方法:将 C. glaziovii 种子置于 70 oC 温度下 15、30、45、60 和 90 分钟,作为发芽前处理。对照组未进行热处理。对发芽变量、无性生长、存活率和正常叶片进行了评估:结果:随着暴露时间的增加,热催芽对 C. glaziovii 种子的发芽率有负面影响。结果:随着暴露时间的增加,热催芽对 C glaziovii 种子的发芽率有负面影响,但却能明显提高该物种移植后的无性生长和幼苗成活率,且不影响正常叶片的形成:结论:对种子进行热催芽可培育出生命力更强的 Ceiba glaziovii 幼苗。
{"title":"Seed thermo-priming accelerates the growth of Ceiba glaziovii (Kutze) K.Schum. seedlings","authors":"José Laurindo dos Santos Júnior, Elizamar Ciríaco da Silva","doi":"10.33494/nzjfs542024x264x","DOIUrl":"https://doi.org/10.33494/nzjfs542024x264x","url":null,"abstract":"Background: Global climate changes have caused temperature increases that can harm plant development, especially the initial growth and establishment of seedlings for the recovery of degraded areas. However, there are species in which these losses are attenuated when the seeds are thermo-primed to sublethal temperatures. Therefore, the objective of the present study was to evaluate the influence of seed heat conditioning on germination and initial growth of Ceiba glaziovii (Kuntze) K. Schum seedlings, an endemic species occurring in seasonally tropical dry forest in Brazil.\u0000Methods: Seeds of C. glaziovii were exposed to 70 oC for 15, 30, 45, 60 and 90 minutes as pre-germination treatments. The control did not undergo heat treatment. Germination variables, vegetative growth, survival rate and normal leaves were evaluated.\u0000Results: Thermo-priming negatively affected the germination proportion of C. glaziovii seeds with increasing exposure time. However, it significantly enhanced vegetative growth and seedling survival rate of this species after transplanting, without impairing the formation of normal leaves.\u0000Conclusions: Thermo-priming of seeds was found to produce more vigorous seedlings of Ceiba glaziovii.","PeriodicalId":19172,"journal":{"name":"New Zealand Journal of Forestry Science","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140397588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Relationship between photosynthetic-water and nitrogen use efficiencies in young Pinus taeda L. trees at two contrasting sites 两个不同地点的欧洲赤松(Pinus taeda L.)幼树光合作用-水和氮利用效率之间的关系
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-03-03 DOI: 10.33494/nzjfs542024x281x
Marco A. Yáñez, S. Espinoza, J. Ovalle, C. Magni, Eduardo E. Martínez
Background: Nitrogen and water are important limiting factors to forest productivity. At the plant level, there is contrasting empirical evidence about the trade-off between water use efficiency (WUE) and nitrogen use efficiency (NUE).Methods: A study was conducted on 3-year-old loblolly pine (Pinus taeda L.) trees sampled at two contrasting sites (Virginia Piedmont (VA) and North Carolina Coastal Plain (NC)) in the southeastern United States. We investigated the leaf-level relationship between water and nitrogen use efficiency (i.e., WUEins versus PNUE). Both parameters were measured in the fall, three years after outplanting.Results: WUEins and PNUE were higher at VA than NC. At both sites, WUEins increased from August to November, while PNUE showed a consistent decline for the same period only at NC, with no clear pattern observed at VA. The Pearson’s coefficient of correlation (r) between WUEins and PNUE was negative (r=0.50) at VA in August, positive (r=0.77) at NC in October, and insignificant for the other measurement dates.Conclusions: Regardless of the site, at the young stage of stand development, WUEins and PNUE were mostly uncoupled, although it can be speculated that a transient trade-off between these two variables can be expected depending on soil water rather than nitrogen availability.
背景:氮和水是森林生产力的重要限制因素。在植物水平上,关于水分利用效率(WUE)和氮素利用效率(NUE)之间的权衡存在着截然不同的经验证据:我们在美国东南部两个截然不同的地点(弗吉尼亚皮德蒙特(VA)和北卡罗来纳州沿海平原(NC))对 3 年树龄的龙柏(Pinus taeda L.)进行了取样研究。我们研究了水分和氮素利用效率(即 WUEins 与 PNUE)之间的叶片关系。这两个参数都是在种植三年后的秋季测量的:结果:弗吉尼亚州的 WUEins 和 PNUE 均高于北卡罗来纳州。在这两个地点,WUEins 从 8 月到 11 月都在增加,而 PNUE 仅在 NC 呈同期持续下降趋势,在 VA 没有观察到明显的模式。WUEins 与 PNUE 之间的皮尔逊相关系数(r)在瓦努阿图的 8 月份为负值(r=0.50),在北卡罗来纳州的 10 月份为正值(r=0.77),在其他测量日期不显著:无论在哪个地点,在林分发展的幼年阶段,WUEins 和 PNUE 大部分是不耦合的,尽管可以推测这两个变量之间可能会有短暂的权衡,这取决于土壤水分而不是氮的可用性。
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引用次数: 0
Peeler core and slabwood fibre properties for Pinus radiata D.Don pulp production 用于辐射松 D.Don 纸浆生产的剥皮机芯材和板材纤维特性
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-02-14 DOI: 10.33494/nzjfs542024x268x
J. Elissetche, L. Apiolaza, R. Alzamora, Luis O. Soto, Jean Pierre Lasserre
Background: Pulp production based on Pinus radiata D.Don is constantly improving the value recovery of logs. One example is using the peeler cores and slabwood derived from sawing and peeling processes to produce pulp. However, these two raw materials have not been characterised for their fibre properties. Methods: We report on four wood fibre quality attributes derived from peeler cores and slabwood, directly influencing pulp quality and pulping process: fibre length (mm), fibre width (µm), fines content (%), and coarseness (µg/m). This pilot study sampled two P. radiata stands grown on different sites and early silvicultural regimes in the Araucanía Region of Chile. Analysis of wood fibre consisted of three trees per stand, and six discs per tree: two at the bottom, two at breast height (1.3 m), and the last two at 5.23 m height. Results: The trajectory of mean annual increment in diameter at breast height (MAI) and periodic annual increment in diameter at breast height (PAI) for trees in the two stands aligned with their respective site qualities and silvicultural regimes. In Stand 1, with a site index of 36, and Stand 2, with a site index of 31, the average proportions of juvenile wood (measured at 1.3 m) were 50% and 53%, respectively. Thus, despite weed control and fertiliser application in Stand 1, there was no increase observed in the proportion of juvenile wood. There were significant differences in fibre properties between peeler core and slabwood, and these differences were present across the range of tree heights and diameters (p<0.05). While there were no statistically significant differences among disc positions, significant distinctions emerged between stands and wood types. The interaction between these factors was also found to be statistically significant (p<0.05).Conclusions: Our study suggests that adding these two materials into the mix for producing pulp would have positive implications due to pulp from peeler core is more suitable for printing and writing grades and addition of mature wood from slabwood, could improve strength properties of paper manufacture. However, it is necessary to test the optimal proportion for the final mix.
背景:以 Pinus radiata D.Don 为原料的纸浆生产正在不断提高原木的价值回收率。其中一个例子就是利用锯木和剥皮过程中产生的剥皮芯材和板材来生产纸浆。然而,这两种原材料的纤维特性尚未得到表征。方法:我们报告了直接影响纸浆质量和制浆工艺的去皮芯材和板材的四种木纤维质量属性:纤维长度(毫米)、纤维宽度(微米)、细粒含量(%)和粗细度(微克/米)。这项试点研究在智利阿劳卡尼亚大区的不同地点和早期造林制度下种植的两片黑檀树林中取样。木纤维分析包括每个林分三棵树,每棵树六个圆盘:两个在底部,两个在胸高(1.3 米)处,最后两个在 5.23 米高处。研究结果两个林分中树木的平均胸径年增量(MAI)和周期性胸径年增量(PAI)轨迹与各自的地点质量和造林制度一致。在林分指数为 36 的 1 号林分和林分指数为 31 的 2 号林分中,幼木(1.3 米处测量)的平均比例分别为 50%和 53%。因此,尽管在林分 1 中进行了杂草控制并施用了肥料,但未观察到幼木比例有任何增加。剥皮芯材和板材之间的纤维特性存在明显差异,而且这些差异在不同树高和直径范围内都存在(p<0.05)。虽然不同圆盘位置之间没有统计学意义上的显著差异,但不同林分和木材类型之间存在显著差异。这些因素之间的相互作用也具有统计学意义(p<0.05):我们的研究表明,在生产纸浆的过程中加入这两种材料会产生积极的影响,因为剥皮机芯的纸浆更适合印刷和书写等级,而加入板材的成熟木材可以提高造纸的强度性能。不过,有必要测试最终混合物的最佳比例。
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引用次数: 0
Do leaf traits affect insect herbivory in a Chinese cork oak forest? 叶片特征会影响中国栓皮栎林中昆虫的食草量吗?
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-02-10 DOI: 10.33494/nzjfs542024x294x
Xinliang Shao, Ke Cheng, Qin Zhang, Fei Xu, Lili Li
Background: It is widely accepted that certain leaf traits indicating leaf quality play an important role in regulating insect herbivory. Numerous studies have attempted to find a clear relationship between insect herbivory and leaf traits. However, the results are inconsistent. In particular, it is still unclear whether leaf traits of a tree species affect insect herbivory in the field.Methods: We examined the effects of leaf traits including structural defensive traits (specific leaf area), nutritional traits (nitrogen content, water content, and soluble sugar content), and chemical defensive traits (tannin content and carbon content) on variation of insect herbivory among three forest strata (vertical variability) and 18 locations (horizontal variability) in a Chinese cork oak (Quercus variabilis) forest landscape.Results: Vertically, insect herbivory in the low-canopy stratum was significantly higher than in the other strata, but variation of leaf traits among strata had little explanatory power for the vertical pattern of insect herbivory. Horizontally, leaf carbon content had weak negative effects on insect herbivory while leaf tannin content had weak and divergent effects on insect herbivory in different strata.Conclusions: Leaf traits selected in this study have weak effects on insect herbivory in the Chinese cork oak forests we studied. These effects may be masked by other abiotic and biotic factors, but further examination is needed.
背景:人们普遍认为,表明叶片质量的某些叶片性状在调节昆虫食草方面起着重要作用。许多研究都试图找到昆虫食草与叶片性状之间的明确关系。然而,研究结果并不一致。特别是,树种的叶片性状是否会影响昆虫在野外的食草性仍不清楚:方法:我们研究了中国栓皮栎(Quercus variabilis)森林景观中三个森林地层(垂直变异)和18个地点(水平变异)的叶片性状,包括结构防御性状(比叶面积)、营养性状(氮含量、含水量和可溶性糖含量)和化学防御性状(单宁含量和碳含量)对昆虫食草量变化的影响:结果:从垂直方向看,低冠层的昆虫食草量明显高于其他层,但层间叶片特征的变化对昆虫食草量的垂直模式几乎没有解释力。在水平方向上,叶片碳含量对昆虫草食性有微弱的负面影响,而叶片单宁含量对不同地层昆虫草食性的影响微弱且存在差异:本研究选择的叶片性状对所研究的中国栓皮栎林中昆虫的食草性有微弱的影响。这些影响可能被其他非生物和生物因素所掩盖,但还需要进一步研究。
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引用次数: 0
Effect of light intensity and seal type on the in vitro elongation and adventitious rooting of Eucalyptus grandis × E. urophylla 光照强度和密封类型对大叶桉×桉树离体伸长和不定根的影响
IF 1.5 4区 农林科学 Q2 Agricultural and Biological Sciences Pub Date : 2024-02-07 DOI: 10.33494/nzjfs542024x284x
Denys Matheus Santana Costa Souza, Sérgio Bruno Fernandes, Vinícius Politi Duarte, Letícia Vaz Molinari, Gustavo Leal Teixeira, G. Brondani
Background: Rejuvenation/reinvigoration of tissues through micropropagation has become an important tool for clonal propagation in eucalypts species. This study evaluated the effect of photomixotrophism (i.e., light intensity and seal type) on in vitro elongation and adventitious rooting to identify the limiting factors on in vitro culture of the Eucalyptus grandis × E. urophylla hybrid.Methods: Nodal segments (i.e., explants) from ministumps grown in a semi-hydroponic system were collected. The effects of light intensity and seal type on in vitro elongation and adventitious rooting stages were evaluated from a 40 μmol m-2 s-1 fluorescent lamp and 20, 40, and 80 μmol m-2 s-1 red/blue LEDs, with (through porous membranes) and without gas exchange.Results: Based on the results at 35 d, 40 μmol m-2 s-1 fluorescent lamp and gas exchange combination was the most suitable for in vitro elongation and adventitious rooting of Eucalyptus grandis × E. urophylla. Both factors increased the vigour, shoot length, photosynthetic pigment content, xylem, phloem, stomatal number and density, root length, diameter, number of roots per explant, and adventitious rooting fraction.Conclusions: Light intensity and seal type influences the in vitro elongation and adventitious rooting of Eucalyptus grandis × E. urophylla. The results contribute to optimising the cloning of commercial eucalypts species by the micropropagation technique.
背景:通过微繁殖使组织返老还童/重新焕发活力已成为桉树物种克隆繁殖的重要工具。本研究评估了光异养生物(即光照强度和密封类型)对离体伸长和不定根的影响,以确定大叶桉×欧斑桉(E. urophylla)杂交种离体培养的限制因素:方法:收集在半水培系统中生长的小型树桩的节段(即外植体)。评估了光照强度和密封类型对体外伸长和不定根阶段的影响,光照强度和密封类型分别来自 40 μmol m-2 s-1 荧光灯和 20、40 和 80 μmol m-2 s-1 红/蓝 LED,有(通过多孔膜)和无气体交换:结果:根据 35 d 的结果,40 μmol m-2 s-1 荧光灯和气体交换的组合最适合大叶桉 × 尢菲拉桉的离体伸长和不定根。这两个因素都增加了桉树的活力、枝条长度、光合色素含量、木质部、韧皮部、气孔数量和密度、根的长度、直径、每个外植体的根数和不定根率:结论:光照强度和密封类型会影响桉树 × 尢菲拉的离体伸长和不定根。这些结果有助于通过微繁殖技术优化商业桉树物种的克隆。
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引用次数: 0
期刊
New Zealand Journal of Forestry Science
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