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From structural diversity measures to ecosystem complexity: Experiments for deriving aggregated complexity indices 从结构多样性测度到生态系统复杂性:综合复杂性指数的推导实验
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2026.101165
Sebas de Smedt, Norul Sobuj, Arne Pommerening
In times where biodiversity is globally under much pressure, effective monitoring of ecosystems is of great importance. As plants and particularly trees tend to shape the physical environment of ecosystems, indicators based on the structural complexity of plant communities are frequently used as surrogates for direct measures of biodiversity. A multitude of such quantitative diversity indicators exist and when considering multiple ecosystem services there is often the need to aggregate them in a single complexity index. We quantified the effects of four statistical techniques of aggregating contributing indices from three overarching tenets of α-diversity, i.e. location (or dispersion) diversity, size and species diversity. In addition we experimentally studied the influence of four different weights assigned to the contributing diversity measures. Overall the differences between the weights and aggregation methods used were comparatively small. Inverse correlation weights combined with arithmetic-geometric aggregation turned out to be the best choice for obtaining a clear complexity gradient for our study data from the boreal forest in Northern Sweden. In our analysis, it proved useful to rely on a small pool of global reference data with a strong structural gradient which served as contrasts and training data in addition to the data of our study plots. The application of random weights as statistical references was very helpful for understanding how weighting and index aggregation works. Our index-aggregation results suggested that the nine Swedish forest plots were at the lower end of global complexity and differed comparatively little in terms of forest structure.
在全球生物多样性面临巨大压力的时代,有效监测生态系统非常重要。由于植物,特别是树木倾向于塑造生态系统的物理环境,基于植物群落结构复杂性的指标经常被用作替代生物多样性的直接措施。存在大量这样的数量多样性指标,在考虑多种生态系统服务时,往往需要将它们汇总为一个单一的复杂性指数。从α-多样性的3个基本原则(即位置(或分散)多样性、大小和物种多样性)出发,量化了4种汇总贡献指数的统计技术的效果。此外,我们还实验研究了四种不同的权重分配给贡献多样性措施的影响。总体而言,所使用的权重和汇总方法之间的差异相对较小。结果表明,逆相关权值与算术-几何聚合相结合是获得瑞典北部北方森林研究数据清晰复杂性梯度的最佳选择。在我们的分析中,事实证明,除了我们的研究数据外,依赖一小部分具有强结构梯度的全球参考数据是有用的,这些数据可以作为对比和训练数据。随机权重作为统计参考的应用对于理解权重和索引聚合的工作原理非常有帮助。我们的指数汇总结果表明,9个瑞典森林样地处于全球复杂性的低端,森林结构差异相对较小。
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引用次数: 0
Dynamics and determinants of forest cover changes in the inner Congo basin 刚果盆地内森林覆盖变化的动态和决定因素
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101126
Lisette Mangaza , Germain Batsi , Adrien Peroches , Claire Masson , Denis Jean Sonwa , Simon Lhoest , Jean-Remy Makana , Wannes Hubau , Philipe Lejeune , Adeline Fayolle
Massive deforestation and forest degradation have been observed in the inner Congo basin in the last decades. While agricultural expansion onto forest land is widely recognized as the main driver of deforestation, local dynamics and social drivers remain understudied. This study investigates both the forest cover dynamics monitored from satellite products and the agricultural practices from household interviews across the Tshopo, the largest province of the Democratic Republic of the Congo (DRC). We combined satellite-based forest cover data (Tropical Moist Forest dataset, 1990–2023) with household surveys (n = 850) around Kisangani, the provincial capital, and up to 150 km along the six main road axes. Between 1990 and 2023, 9.7 % of mature tropical moist forest — corresponding to 1905,800 ha — was lost across the Tshopo province, being deforested, degraded, or disturbed. Deforestation accelerated since 2010, and the spatial pattern indicates urban expansion, and agricultural encroachment into forests. Household interviews confirm that small-scale farming is the dominant agricultural system in the region (94 % of respondents), with fields mostly installed on fallow land. The food crops such as cassava, rice, maize and bananas are predominant and perennial crops such as oil palms, cocoa and coffee are less common. Geographical and production factors, namely proximity to Kisangani city and household economic capital, are the main determinants of agricultural practices in the Tshopo. Although individual small-scale farming has a limited impact on forest cover (only 11 % of food crop fields and 8 % of perennial crop plantations are established on mature forest lands), the cumulative effect of seasonal land conversion is substantial. Household-level deforestation (349 ha per cropping season for 850 households) extrapolated to approximately 195,000 ha of mature forest cleared annually across the province. Given the high level of human impact and poverty in the region, it is crucial to promote sustainable agricultural practices that increase productivity without encroaching on mature forests, considering the diversity of producer profiles, in a context of high instability.
在过去的几十年里,刚果盆地内部出现了大规模的森林砍伐和森林退化。虽然农业向林地的扩张被广泛认为是森林砍伐的主要驱动因素,但对当地动态和社会驱动因素的研究仍然不足。本研究调查了通过卫星产品监测的森林覆盖动态,以及通过对刚果民主共和国(DRC)最大省份Tshopo的家庭访谈进行的农业实践。我们将基于卫星的森林覆盖数据(热带潮湿森林数据集,1990-2023)与在基桑加尼(省会)周围以及沿着6条主干道轴线150公里范围内的住户调查(n = 850)相结合。1990年至2023年期间,整个措布省9.7%的成熟热带潮湿森林(相当于1905 800公顷)因森林被砍伐、退化或受到干扰而丧失。自2010年以来,森林砍伐加速,空间格局显示城市扩张和农业对森林的侵占。家庭访谈证实,小规模农业是该地区的主要农业系统(94%的受访者),农田大多位于休耕土地上。木薯、水稻、玉米和香蕉等粮食作物占主导地位,油棕、可可和咖啡等多年生作物则不太常见。地理和生产因素,即靠近基桑加尼市和家庭经济中心,是Tshopo农业实践的主要决定因素。虽然个体小规模农业对森林覆盖的影响有限(只有11%的粮食作物田和8%的多年生作物种植园是在成熟林地上建立的),但季节性土地转换的累积效应是巨大的。家庭一级的森林砍伐(850户家庭每个种植季节349公顷)推算为全省每年大约有19.5万公顷的成熟森林被砍伐。考虑到该地区严重的人类影响和贫困,在高度不稳定的情况下,考虑到生产者情况的多样性,促进在不侵犯成熟森林的情况下提高生产力的可持续农业做法至关重要。
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引用次数: 0
Exploring behavioral determinants of sustainable agricultural practices adoption in Morocco: Evidence from PLS-SEM 探索摩洛哥可持续农业实践采用的行为决定因素:来自PLS-SEM的证据
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101143
Soufiane Bouyghrissi , Maha Khanniba , Hanaa Touloub , Mohamed Torra , Omar Kharbouch
This study investigates the drivers of sustainable agricultural practices (SAPs) adoption in Morocco by using Partial Least Squares Structural Equation Modeling (PLS-SEM) on survey data from 402 farmers. The model examines the effects of attitudes (AT), subjective norms (SN), perceived behavioral control (PBC), and knowledge (KN) on actual adoption behavior. The results show that attitude is the strongest positive predictor of SAP adoption, while knowledge contributes indirectly by shaping attitudes. Subjective norms also influence adoption, although their effect is modest and negative, suggesting that farmers may perceive caution or mixed messages regarding SAP use. Perceived behavioral control does not significantly affect adoption in this context.
The findings highlight the importance of psychological and social processes in shaping farmers’ decisions and demonstrate that technical knowledge alone is insufficient to drive behavioral change. Clear policy implications emerge from this analysis. Extension programs should prioritize strengthening positive attitudes by showcasing local demonstrations, communicating tangible benefits, and offering risk-reducing incentives. Farmer training initiatives should integrate social learning mechanisms, such as peer-to-peer exchanges and cooperative-based activities, to leverage community influence and ensure equitable access to information. Policymakers seeking to scale SAP uptake should therefore invest in both informational outreach and social infrastructure, recognizing that behavior change in agriculture is fundamentally shaped by farmers’ beliefs, motivations, and social environments.
本研究通过对402名农民的调查数据使用偏最小二乘结构方程模型(PLS-SEM)来调查摩洛哥采用可持续农业实践(sap)的驱动因素。该模型考察了态度(AT)、主观规范(SN)、感知行为控制(PBC)和知识(KN)对实际收养行为的影响。结果表明,态度是SAP采用的最强正向预测因子,而知识通过塑造态度间接起作用。主观规范也影响采用,尽管其影响是适度和消极的,这表明农民可能对SAP的使用感到谨慎或混杂的信息。在这种情况下,感知行为控制对收养没有显著影响。研究结果强调了心理和社会过程在影响农民决策方面的重要性,并表明仅靠技术知识不足以推动行为改变。从这一分析中可以看出明显的政策含义。推广项目应通过展示当地的示范、宣传切实的利益和提供降低风险的激励措施,优先加强积极的态度。农民培训倡议应纳入社会学习机制,例如点对点交流和基于合作的活动,以利用社区影响并确保公平获取信息。因此,寻求扩大SAP应用规模的政策制定者应在信息推广和社会基础设施方面进行投资,认识到农业行为的改变从根本上是由农民的信仰、动机和社会环境决定的。
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引用次数: 0
Topography determines soil C:N:P stoichiometry more than forest attributes in heterogeneous subtropical karst forests 在非均质亚热带喀斯特森林中,地形对土壤C:N:P化学计量的影响大于森林属性
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101142
Lu Yan , Chaohao Xu , Cong Hu , Chaofang Zhong , Zhonghua Zhang , Gang Hu
Understanding the ecological stoichiometry of soil nutrients and their drivers is essential for managing forest ecosystems, particularly in highly heterogeneous landscapes, such as karst forests. However, the effects of topography and forest attributes on soil carbon (C), nitrogen (N), and phosphorus (P) stoichiometry in these ecosystems remain unclear. This study investigated the influence of topographic conditions and forest attributes on the contents and stoichiometric ratios of C, N, and P in the surface soils (0–10 cm) of species-rich subtropical karst forests in China. The results showed that topography dominated the variability in total nitrogen (TN) and total phosphorus (TP) contents and their stoichiometry. TN and TP increased by 0.51 % and 0.97 %, respectively, per 1 % increase in rock exposure rate (RER), but decreased by 0.46 % and 1.79 % per 1-m rise in elevation (ELE). In contrast, the C:N, C:P, and N:P ratios exhibited opposite trends. The soil organic carbon (SOC) was not significantly affected by topography. Forest attributes showed limited influence, explaining only 6.02 % of the total variance in soil C:N:P stoichiometry. SOC and TN increased with the nearest taxon index (NTI), while the C:N and C:P ratios declined with the Shannon–Wiener diversity index. Correlation analyses revealed significant associations among topographic variables (ELE, RER, and aspect), forest attributes (Pielou’s evenness, NTI, and mean DBH), and soil C:N:P stoichiometry. The redundancy analysis revealed that topography accounted for a greater proportion of the variance (35.21 %) than forest attributes (6.02 %), with ELE, RER, and slope contributing 19.22 %, 10.98 %, and 3.18 %, respectively. These findings highlight that topographic conditions rather than forest characteristics are the primary drivers of soil C:N:P stoichiometric patterns in heterogeneous karst forests. This information is critical for guiding effective forest management and restoration strategies in karst regions.
了解土壤养分的生态化学计量及其驱动因素对于管理森林生态系统至关重要,特别是在高度异质性的景观中,如喀斯特森林。然而,地形和森林属性对这些生态系统土壤碳(C)、氮(N)和磷(P)化学计量的影响尚不清楚。研究了地形条件和森林属性对中国亚热带丰富物种喀斯特森林表层土壤(0 ~ 10 cm) C、N、P含量和化学计量比的影响。结果表明,地形对全氮(TN)和全磷(TP)含量及其化学计量变化起主导作用。岩石暴露率每升高1%,总氮和总磷分别增加0.51%和0.97%,海拔每升高1 m,总氮和总磷分别减少0.46%和1.79%。C:N、C:P和N:P呈相反趋势。土壤有机碳(SOC)受地形影响不显著。森林属性对土壤C:N:P化学计量变异的影响有限,仅占总变异的6.02%。土壤有机碳和全氮随最近分类群指数(NTI)的增加而增加,而C:N和C:P随Shannon-Wiener多样性指数的增加而降低。相关分析显示,地形变量(ELE、RER和坡向)、森林属性(Pielou均匀度、NTI和平均胸径)和土壤C:N:P化学计量学之间存在显著相关性。冗余分析结果显示,地形对森林属性的贡献率(35.21%)大于森林属性(6.02%),其中ELE、RER和坡度对森林属性的贡献率分别为19.22%、10.98%和3.18%。这些结果表明,地形条件而不是森林特征是非均质喀斯特森林土壤C:N:P化学计量模式的主要驱动因素。这些信息对于指导喀斯特地区有效的森林管理和恢复战略至关重要。
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引用次数: 0
Carbon stock and woody species diversity of the forests in Zegie Peninsula and monastic islands of Lake Tana, Ethiopia 埃塞俄比亚泽吉半岛和塔纳湖修道院岛森林的碳储量和木本物种多样性
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2026.101163
Abebe Worku Amberbir , Amare Bitew Mekonnen , Ejigu Alemayehu Worku , Getahun Yemata Lule
Forests of the Zegie Peninsula and nearby monastic islands in Lake Tana are important refuges of biodiversity and major carbon sinks. However, their carbon stocks remain poorly quantified, and woody species diversity had not been well documented. This study assessed woody species diversity, plant community structure, forest biomass, and carbon stocks using standard allometric equations. Data were collected from 165 plots across Zegie, Daga Estifanos, Kebran Gebriel, and Entons Eyesus. A total of 89 woody species were identified, representing 75 genera and 40 families, and three plant communities were identified Coffea arabica-Ehretia cymosa, Mimusops kummel-Syzygium guineense, and Celtis Africana-Stereospermum kunthianum. Aboveground biomass ranged from 27.37 to 115.31 tons ha⁻¹, and the combined carbon stock from aboveground, belowground, and soil pools ranged from 163.31 to 214.59 tons ha⁻¹. The soil organic carbon pool contributed the largest and stable share of the total carbon stock ranged from 154.25 to 137.25 tons ha−1. Aboveground biomass showed significant variation with slope aspect and declined with increasing altitude and slope. Overall, the high carbon stocks and woody species richness highlight the ecological significance of these forests and support their inclusion in REDD+ and other payment-based ecosystem service and forest conservation initiatives.
泽吉半岛的森林和塔纳湖附近的修道院岛屿是生物多样性的重要避难所和主要的碳汇。然而,它们的碳储量量化仍然很差,木本物种多样性没有得到很好的记录。本研究利用异速生长方程对木本物种多样性、植物群落结构、森林生物量和碳储量进行了评价。数据收集自Zegie、Daga Estifanos、Kebran Gebriel和Entons Eyesus的165个地块。共鉴定出40科75属89种木本植物,并鉴定出3个植物群落,分别是咖啡(Coffea arabica) -铁杉(ehretia cymosa)、蜜豆(Mimusops kummel) -几内亚(syzygium guineense)和非洲芹(Celtis africana) -立体spermum kunthianum。地上生物量从27.37吨到115.31吨不等,地上、地下和土壤池的碳储量总和从163.31吨到214.59吨不等。土壤有机碳库对总碳储量贡献最大且稳定,为154.25 ~ 137.25 t ha - 1。地上生物量随坡向变化显著,随海拔和坡度的增加而下降。总体而言,高碳储量和丰富的木本物种突出了这些森林的生态意义,并支持将其纳入REDD+和其他基于付费的生态系统服务和森林保护倡议。
{"title":"Carbon stock and woody species diversity of the forests in Zegie Peninsula and monastic islands of Lake Tana, Ethiopia","authors":"Abebe Worku Amberbir ,&nbsp;Amare Bitew Mekonnen ,&nbsp;Ejigu Alemayehu Worku ,&nbsp;Getahun Yemata Lule","doi":"10.1016/j.tfp.2026.101163","DOIUrl":"10.1016/j.tfp.2026.101163","url":null,"abstract":"<div><div>Forests of the Zegie Peninsula and nearby monastic islands in Lake Tana are important refuges of biodiversity and major carbon sinks. However, their carbon stocks remain poorly quantified, and woody species diversity had not been well documented. This study assessed woody species diversity, plant community structure, forest biomass, and carbon stocks using standard allometric equations. Data were collected from 165 plots across Zegie, Daga Estifanos, Kebran Gebriel, and Entons Eyesus. A total of 89 woody species were identified, representing 75 genera and 40 families, and three plant communities were identified <em>Coffea arabica</em>-<em>Ehretia cymosa, Mimusops kummel</em>-<em>Syzygium guineense</em>, and <em>Celtis Africana</em>-<em>Stereospermum kunthianum</em>. Aboveground biomass ranged from 27.37 to 115.31 tons ha⁻¹, and the combined carbon stock from aboveground, belowground, and soil pools ranged from 163.31 to 214.59 tons ha⁻¹. The soil organic carbon pool contributed the largest and stable share of the total carbon stock ranged from 154.25 to 137.25 tons ha<sup>−1</sup>. Aboveground biomass showed significant variation with slope aspect and declined with increasing altitude and slope. Overall, the high carbon stocks and woody species richness highlight the ecological significance of these forests and support their inclusion in REDD+ and other payment-based ecosystem service and forest conservation initiatives.</div></div>","PeriodicalId":36104,"journal":{"name":"Trees, Forests and People","volume":"23 ","pages":"Article 101163"},"PeriodicalIF":2.9,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146037526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Coupling mechanisms and optimization of urban green space equity and income distribution based on multi-source big data: A case study of beijing 基于多源大数据的城市绿地公平与收益分配耦合机制及优化——以北京市为例
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101136
Mengtao Chu , Dongwei Tian , Yuhang Zhang , Jinxiao Zhang , Yipeng Wang
Urban green spaces are essential components of green infrastructure and ecosystems, playing a vital role in environmental sustainability and residents’ well-being. With socioeconomic development and rising living standards, public demand for better-quality and more equitably distributed green space has increased. However, most studies focus on large and medium-sized parks, overlooking the role of small green spaces in spatial equity. Using Beijing as a case study, this research integrates multi-source big data to evaluate green space equity through the Gaussian Two-Step Floating Catchment Area (G2SFCA) method. It combines income distribution modeling, Lorenz curves, and Gini coefficients, and applies the Coupling Coordination Degree Model (CCDM) to explore the spatial coupling between green space equity and residents’ income distribution. Results show that: (1) Green space distribution in Beijing is notably uneven, with a population-weighted Gini coefficient of 0.3388. The top 10 % of the population by township has access to only about 0.6 % of green space, while the top 10 % of green space–rich areas accommodate 25–45 % of residents. In outer suburbs and ecological zones, a small population occupies most green resources. (2) Income distribution is also highly unequal, with a Gini coefficient of 0.7883. The lowest 10 % of the population holds merely 0.01–0.6 % of total income, while the highest-income 10 % captures 25–45 %. Income is relatively balanced in central districts but highly concentrated in the periphery. (3) Coupling between green space equity and income distribution varies spatially. Among 331 townships, 19.9 % show high coordination—mainly in the southeast and northwest—while 40.1 % are poorly coordinated, mostly in northern, central, and edge areas. Coupling coordination correlates positively with green space equity and less strongly with income. Quadrant analysis indicates that about 70 % of townships exhibit a “high–low mismatch,” reflecting social–ecological imbalance. The study suggests optimizing green space layout in outer suburbs and low-coordination areas, enhancing public green space provision, and promoting more balanced income distribution to support sustainable urban development and equitable access to green infrastructure.
城市绿地是绿色基础设施和生态系统的重要组成部分,在环境可持续性和居民福祉方面发挥着至关重要的作用。随着社会经济的发展和人民生活水平的提高,公众对质量更好、分布更合理的绿地的需求日益增加。然而,大多数研究都集中在大中型公园,忽视了小型绿地在空间公平中的作用。本研究以北京市为例,采用高斯两步浮动集水区(G2SFCA)方法,整合多源大数据对绿地权益进行评价。结合收入分配模型、洛伦兹曲线和基尼系数,运用耦合协调度模型(CCDM)探讨绿地公平与居民收入分配的空间耦合关系。结果表明:①北京市绿地分布不均匀性显著,人口加权基尼系数为0.3388;按乡镇划分的前10%的人口只能获得约0.6%的绿地,而前10%的绿地丰富地区容纳了25 - 45%的居民。在远郊和生态区,很少的人口占据了大部分的绿色资源。(2)收入分配极不平等,基尼系数为0.7883。收入最低的10%的人只占有总收入的0.01 - 0.6%,而收入最高的10%的人占有总收入的25 - 45%。中心地区的收入相对均衡,而边缘地区的收入高度集中。(3)绿地公平与收入分配的耦合存在空间差异。在331个乡镇中,协调度高的占19.9%,主要集中在东南部和西北部,协调度差的占40.1%,主要集中在北部、中部和边缘地区。耦合协调与绿地公平呈正相关,与收入的相关性较弱。象限分析表明,约70%的乡镇表现出“高低失配”,反映了社会生态失衡。研究建议优化远郊和低协调区绿地布局,加强公共绿地供给,促进收入分配更加均衡,以支持城市可持续发展和绿色基础设施的公平使用。
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引用次数: 0
Assessment of community sustainability on social forestry program implementation in Indonesia: Insights from agroforestry model in Java and Sumatra 印度尼西亚社会林业项目实施的社区可持续性评估:来自爪哇和苏门答腊农林业模式的见解
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101124
Rospita Odorlina Situmorang, Sanudin, Ary Widiyanto, Eva Fauziyah
The Indonesia Social Forestry (SF) program has been implemented in different schemes and geographic locations, necessitating rigorous assessment to evaluate the effectiveness of its management. This study seeks to compare the implementation of the SF program in Java and Sumatra by conducting a sustainability analysis at community level. The research encompassed six communities, employing distinct SF scheme, twenty indicators - categorised into institutional, governance, and outcome dimensions were to utilized to calculate the sustainability index for each community. This finding indicate that communities in Java exhibit greater sustainability than those in Sumatra, as exhibit by their higher overall sustainability index (OSI). Java communities demonstrate superior performance in most institutional and governance indicators and derive enhanced socio-economic benefits from the SF program. Furthermore, the longevity of communities institutions and increased value of SF product's are indicative of more mature organizational governance and heightened entreprencurial capacity within these communities.
印度尼西亚社会林业(SF)计划在不同的计划和地理位置实施,需要进行严格的评估以评估其管理的有效性。本研究旨在通过在社区层面进行可持续性分析,比较爪哇岛和苏门答腊岛SF项目的实施情况。该研究包括六个社区,采用不同的SF方案,20个指标-分为制度,治理和结果维度,用于计算每个社区的可持续性指数。这一发现表明,爪哇岛的社区比苏门答腊岛的社区表现出更强的可持续性,正如其更高的总体可持续性指数(OSI)所显示的那样。Java社区在大多数制度和治理指标上表现优异,并从SF计划中获得了增强的社会经济效益。此外,社区机构的寿命和SF产品价值的增加表明这些社区中更成熟的组织治理和更高的创业能力。
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引用次数: 0
Rapid recovery of Brazilian tropical savanna woodlands (Cerrado stricto sensu) to prescribed burns 巴西热带稀树草原林地(严格意义上的塞拉多)对规定烧伤的迅速恢复
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101129
George Louis Vourlitis , Higo Jose Dalmagro , Osvaldo Borges Pinto Jr. , Robson Nunes Vieira , Carlos Roberto Ribeiro Malhado , Paulo Henrique Zanella de Arruda
Fire is an important agent of disturbance for Brazilian tropical savanna (Cerrado), but fire suppression in protected areas like National Parks has transformed savanna grasslands and woodlands into forests. This transformation has caused a decline in biodiversity, prompting land managers to re-introduce fire to reduce tree encroachment and preserve the high biodiversity of these grasslands and woodlands. We partnered with land managers of the Chapada dos Guimarães National Park to conduct prescribed burns during the 2022 and 2023 dry seasons in Cerrado woodlands (stricto sensu). Our objectives were to determine how understory vegetation, tree growth, recruitment and mortality, and tree species composition were affected by the prescribed fires. We followed understory cover, tree species abundance, growth, mortality, and recruitment, surface root production, and soil nitrogen (N) and phosphorus (P) content over a period of 1-2 years after fire to assess short-term stand recovery. Climatic conditions were similar prior to each fire, and while ground surface temperatures were similar for each fire, the 2023 fire was hotter in the understory canopy. Understory vegetation grew significantly faster in burned vs. unburned plots one year of post-fire. Tree mortality was significantly higher in burned stands one year after fire, but after two years of recovery tree mortality was similar in burned and unburned plots. Furthermore, trees that died in burned plots had significantly smaller diameters that trees that died in unburned plots, suggesting that fire differentially affected smaller trees. Tree recruitment was not significantly affected by fire, but species such as Andira cujabensis, Qualea grandiflora, and Tachigali vulgaris had a fire-induced increase in relative growth rate (RGR) during the first year of post-fire recovery. Fire also increased the relative abundance of A. cujabensis and T. vulgaris but caused a significant decline in Cenostigma macrophyllum that persisted for two years after fire. Together, these results indicate a resilient vegetation response to fire, especially for understory vegetation and tree species that are considered fire resistant. These data can help inform land managers on how to use fire as a tool for reducing tree encroachment and preserving biodiversity of these protected woodlands.
火灾是巴西热带稀树草原(塞拉多)的重要干扰因素,但国家公园等保护区的灭火行动已将稀树草原和林地转变为森林。这种转变导致了生物多样性的下降,促使土地管理者重新引入火来减少树木的入侵,并保护这些草原和林地的高度生物多样性。我们与Chapada dos guimar es国家公园的土地管理者合作,在2022年和2023年旱季在塞拉多林地(严格意义上)进行规定的焚烧。我们的目的是确定林下植被、树木生长、补充和死亡以及树种组成如何受到规定火灾的影响。在火灾后1 ~ 2年的时间里,我们通过跟踪林下盖度、树种丰度、生长、死亡和补充、地表根系产量和土壤氮、磷含量来评估林分的短期恢复情况。每次火灾前的气候条件相似,虽然每次火灾的地表温度相似,但2023年的火灾在林下冠层中更热。火灾后1年,燃烧样地林下植被的生长速度明显快于未燃烧样地。火灾发生1年后,烧毁林分的树木死亡率显著高于未烧毁林分,但恢复2年后,烧毁林分和未烧毁林分的树木死亡率相似。此外,在烧毁地块中死亡的树木的直径明显小于未烧毁地块中死亡的树木,这表明火灾对较小树木的影响不同。树木补充不受火灾的显著影响,但在火灾恢复后的第1年,山核桃、大花夸兰和奇加利等树种的相对生长率(RGR)均有火灾诱导的增加。火也增加了库jabensis和T. vulgaris的相对丰度,但导致巨叶隐柱头(Cenostigma macrophyllum)的显著下降,并持续2年。综上所述,这些结果表明植被对火灾的响应是有弹性的,特别是对于被认为是防火的林下植被和树种。这些数据可以帮助土地管理者了解如何利用火作为减少树木入侵和保护这些受保护林地生物多样性的工具。
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引用次数: 0
Threshold-driven spatial configuration for urban park cooling: Translating multi-metric analysis into actionable design guidelines in Shenzhen 阈值驱动的城市公园降温空间配置:将多度量分析转化为可操作的深圳设计指南
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2026.101153
Haoran Tang , Haoran Hu , Xinyun Qiu , Guoyi Wang
Urban parks are vital thermal regulators in rapidly urbanizing regions, while advances in spatial metrics and machine learning exist, the systematic identification of environmental thresholds across multiple cooling metrics and translating multidimensional cooling analyses into actionable design guidelines for medium-to-large urban parks remain challenging. This study applies an ensemble engineering pipeline by integrating Random Forest feature selection, LightGBM modeling, and SHAP interpretability to analyze cooling performance across 196 parks in Shenzhen. Our analysis reveals critical compound thresholds: Parks under 20 ha achieve optimal cooling effect when situated in high-vegetation zones, whereas larger parks maintain stable cooling efficiency. Forest area benefits for park cooling intensity plateau at approximately 5 ha but continue enhancing cooling area, indicating metric-specific optimization needs. Road density exceeding 15% significantly impairs cooling performance, with distinct thresholds per metric. We translate these findings into practical design rules: Maintaining tree heights at 10–15 m maximizes cooling efficiency for smaller parks, while limiting impervious surfaces below 40% enhances cooling extent. By systematically examining interactions between two-dimensional landscape metrics, three-dimensional vegetation characteristics, and urban context across multiple cooling indicators, this work demonstrates how ensemble machine learning techniques, when coupled with interpretability methods, can generate implementable thermal resilience strategies within existing urban design frameworks. The study bridges the gap between complex nonlinear analysis and actionable engineering guidance for subtropical megacities facing acute heat challenges.
在快速城市化地区,城市公园是至关重要的热调节器,尽管空间指标和机器学习已经取得了进展,但系统地识别多个冷却指标的环境阈值,并将多维冷却分析转化为大中型城市公园的可操作设计指南,仍然具有挑战性。本研究采用集成工程管道,结合随机森林特征选择、LightGBM建模和SHAP可解释性,对深圳196个公园的制冷性能进行了分析。我们的分析揭示了关键的复合阈值:20公顷以下的公园在位于高植被带时达到最佳冷却效果,而较大的公园则保持稳定的冷却效率。森林面积在约5 ha时有利于公园冷却强度高原,但继续增加冷却面积,表明特定指标的优化需求。道路密度超过15%会显著损害冷却性能,每个指标有不同的阈值。我们将这些发现转化为实用的设计规则:将树木高度保持在10-15米可以最大限度地提高小型公园的冷却效率,同时将不透水表面限制在40%以下可以提高冷却程度。通过系统地研究二维景观指标、三维植被特征和多个冷却指标之间的相互作用,这项工作展示了集成机器学习技术如何与可解释性方法相结合,在现有的城市设计框架内产生可实施的热弹性策略。该研究弥补了复杂的非线性分析和可操作的工程指导之间的差距,为面临急性热挑战的亚热带特大城市。
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引用次数: 0
How does climate influence mangrove litterfall production across different species? A case study in Zhanjiang, China 气候如何影响不同物种的红树林凋落物产量?以中国湛江为例
IF 2.9 Q1 FORESTRY Pub Date : 2026-01-01 DOI: 10.1016/j.tfp.2025.101137
Yuhang Wang , Qi Liu , Xiafei Zhou , Wanyu Wen , Minghao Gong , Yaojun Zhu
Mangrove litterfall represents a major pathway of energy and nutrient flux, yet species-specific and organ-specific climatic responses remain insufficiently understood. This study quantified litterfall dynamic of three dominant mangrove species—Avicennia marina, Bruguiera gymnorhiza, and Rhizophora stylosa—compared fresh and dry organ-level phenology, and identified climatic drivers of species- and organ-specific litterfall patterns. Litterfall was monitored sub-monthly for two years (2023–2024) in mature subtropical stands and partitioned into leaves, flowers, propagules, and branches. Across species, annual fresh litterfall ranged from 1675.39 g m⁻²·in A. marina to 2998.74 g m⁻²·in B. gymnorhiza, with leaves contributing over 60% of total biomass. B. gymnorhiza and R. stylosa consistently produced more litterfall than A. marina. Pronounced interspecific differences were observed: B. gymnorhiza exhibited the strongest seasonality with sharp mid-year peaks, whereas R. stylosa maintained relatively stable production year-round. Leaf and flower litterfall showed asynchronous seasonal patterns across species, while propagule and branch litterfall displayed distinctly staggered reproductive and structural turnover cycles. To examine climatic effects, we employed Bayesian generalized additive mixed models (GAMMs), which capture nonlinear climate–litterfall relationships and account for hierarchical variation among species and organs. The models revealed clear functional differentiation in climatic sensitivity. Temperature positively influenced leaf and flower litterfall, particularly above 28 °C. Precipitation showed unimodal effects, and maximum wind speed strongly promoted flower and propagule litterfall, especially in A. marina and R. stylosa. Relative humidity had generally minor effects. Leaf litterfall showed the strongest climatic response, while branch litterfall was least sensitive. Overall, this study highlights contrasting phenological rhythms and climatic sensitivities among coexisting mangrove species and provide insights to support mangrove restoration, carbon accounting, and climate adaptation in subtropical coastal ecosystems.
红树林凋落物是能量和养分流动的主要途径,但物种特异性和器官特异性气候反应仍未得到充分了解。本研究量化了三种优势红树林(avicennia marina、Bruguiera gymnorhiza和Rhizophora stylosa)的凋落物动态,比较了新鲜和干燥器官水平的物候特征,并确定了物种和器官特异性凋落物模式的气候驱动因素。2023-2024年对亚热带成熟林分的凋落物进行了分月监测,并将凋落物分为叶、花、繁殖体和枝。在不同的物种中,每年的新鲜凋落物从A. marina的1675.39 g m⁻²·到B. gymnorhiza的2998.74 g m⁻²·不等,其中叶子贡献了总生物量的60%以上。金毛草和柱头草的凋落物产量始终高于金毛草。不同种间差异显著:木犀草的季节性最强,年中产量高峰明显,而茎柱草全年产量相对稳定。不同物种的叶、花凋落物表现出不同步的季节特征,而繁殖体和枝凋落物表现出明显交错的繁殖周期和结构周转周期。为了研究气候效应,我们采用了贝叶斯广义加性混合模型(GAMMs),该模型捕捉了非线性气候-凋落物关系,并解释了物种和器官之间的等级差异。这些模型揭示了气候敏感性的明显功能分化。温度对叶和花凋落物有积极影响,特别是在28°C以上。降水表现出单峰效应,最大风速对花凋落量和繁殖体凋落量的促进作用最大,尤以金针花和柱头草为明显。相对湿度的影响一般较小。叶凋落物对气候的响应最强烈,枝凋落物对气候的响应最不敏感。总的来说,本研究突出了共存红树林物种之间的物候节律和气候敏感性的对比,并为支持亚热带沿海生态系统的红树林恢复、碳核算和气候适应提供了见解。
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Trees, Forests and People
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