Trees, Forests and People最新文献_第7页

Nature conservation or forest management? A social milieu perspective on private forest owner differences in Germany 自然保护还是森林管理？德国私人森林所有者差异的社会环境视角

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-11 DOI: 10.1016/j.tfp.2025.101121

Peter K. Aurenhammer, Maximilian Glormann

This study examines how private forest owners (PFOs) in Germany differ in their forest-related attitudes and practices across the ten Sinus Milieus, with a particular focus on nature conservation and traditional forest management. Building on the dataset from Feil et al. (2018), we conducted a new analysis of 40 forest-related variables to assess whether PFOs from postmaterialist milieus stand out in their support for nature conservation and whether a divide exists between so-called “forestry-close” and “forestry-distant” milieus. While this distinction appears to hold to some extent at the level of attitudes, actual practices reveal a far more differentiated picture. PFOs from the Conservative-Established and Modern Mainstream milieus consistently supported traditional forest management. However, the Traditional milieu—typically considered forestry-close—showed notable support for both conservation and management attitudes and practices. Conversely, certain forestry-distant milieus, especially the Socio-Ecologicals, Performers, and Hedonists, demonstrated strong engagement in both conservational and managerial activities. Although postmaterialist milieus strongly supported nature conservation (among others), they were not unique in this respect. This study shows that Sinus Milieus provide a reliable basis for distinguishing between PFO groups with significantly different forest-related attitudes and behaviours, offering a more nuanced perspective than traditional socio-demographic classifications. The findings highlight the need for forest policy and outreach to move beyond simplistic dichotomies and instead adopt milieu-specific approaches. The study also recognises limitations related to the interpretation of key terms such as conservation or felling, which may vary across milieus. Further qualitative research is underway to explore these conceptual understandings more deeply. In sum, the assumption of a clear divide between forestry-close and forestry-distant PFOs does not sufficiently reflect the complexity of forest-related decision-making.

本研究考察了德国私人森林所有者（pfo）在10个“森林之窦”环境中与森林有关的态度和做法的差异，并特别关注自然保护和传统森林管理。基于Feil等人（2018）的数据集，我们对40个与森林相关的变量进行了新的分析，以评估来自后唯物主义环境的全氟辛烷化合物是否在支持自然保护方面表现突出，以及所谓的“森林近”和“森林远”环境之间是否存在鸿沟。虽然这种区别在某种程度上似乎在态度层面上成立，但实际做法显示出一种截然不同的情况。来自保守主义和现代主流环境的全氟辛烷磺酸一贯支持传统的森林管理。然而，传统环境- -通常被认为是森林- -对保护和管理的态度和做法都显示出显著的支持。相反，某些远离森林的环境，特别是社会生态学家、表演者和享乐主义者，在保护和管理活动中表现出强烈的参与。虽然后唯物主义环境强烈支持自然保护（以及其他），但他们在这方面并不是独一无二的。该研究表明，鼻窦环境为区分具有显著不同森林相关态度和行为的PFO群体提供了可靠的基础，提供了比传统社会人口分类更细致入微的视角。调查结果强调，森林政策和外联需要超越简单的二分法，而是采取具体环境的方法。该研究还认识到对保护或砍伐等关键术语的解释存在局限性，这些术语可能因环境而异。进一步的定性研究正在进行中，以更深入地探索这些概念上的理解。总而言之，关于近林和远林全氟烃类的明确划分的假设并不能充分反映与森林有关的决策的复杂性。

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引用次数: 0

Trade-off between NTFP harvesting and tourism income in a protected area: Evidence from the Yading Biosphere Reserve, China 保护区NTFP采伐与旅游收入的权衡：来自亚丁生物圈保护区的证据

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-11 DOI: 10.1016/j.tfp.2025.101122

Yuqing Liu , Xukun Su , Lingfan Wan , Guohua Liu , Jian Sun

Protected areas contribute to poverty alleviation through the provision of non-timber forest products (NTFPs), but relatively few studies have researched the recreational context and the socio-ecological interactions that influence household NTFPs income. Using household surveys in the Yading biosphere reserve (2020-2022), our study investigated factors affecting income of main NTFPs including caterpillar fungus (Ophiocordyceps sinensis) and matsutake mushroom (Tricholoma matsutake). The generalized linear mixed model is used to explain the difference of NTFPs utilization patterns among households. The finding indicates that NTFPs account for 30.0% of household income in the protected area, comparing to tourism income (35.3%). A significant trade-off relationship was found between NTFPs harvesting and tourism income. Meanwhile, harvesting activities serve as an approach for asset accumulation to enable a transition to higher-value livelihoods. Elevation and tourism income emerged as the primary determinants of overall NTFP income. In addition, household landholdings and the number of males were distinctly associated with income from T. matsutake, whereas the educational attainment of household labor was a key predictor of income from O. sinensis. This research provides an empirical analysis of the factors that affect NTFP incomes, enabling the potential role of wild production in supporting sustainable livelihoods to be explored. Our findings have important implications for understanding the alpine protected area household livelihoods and designing conservation interventions that affect access to and use of wild natural resources.

保护区通过提供非木材林产品（NTFPs）有助于减轻贫困，但相对较少的研究研究了娱乐背景和影响家庭NTFPs收入的社会生态相互作用。采用入户调查的方法（2020-2022年），对亚丁生物圈保护区主要非森林保护地冬虫夏草（Ophiocordyceps sinensis）和松茸（Tricholoma matsutake）的收入影响因素进行了研究。采用广义线性混合模型解释了不同家庭间nntfp利用模式的差异。研究结果表明，与旅游收入（35.3%）相比，非森林保护区占保护区家庭收入的30.0%。非森林保护区采伐与旅游收入之间存在显著的权衡关系。与此同时，收获活动作为一种资产积累的方法，使其能够向更高价值的生计过渡。海拔和旅游收入成为影响NTFP总体收入的主要因素。此外，家庭土地拥有量和男性数量与松茸收入显著相关，而家庭劳动力的受教育程度是松茸收入的关键预测因子。本研究对影响非森林保护计划收入的因素进行了实证分析，从而能够探索野生生产在支持可持续生计方面的潜在作用。我们的研究结果对了解高山保护区的家庭生计和设计影响野生自然资源获取和利用的保护干预措施具有重要意义。

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引用次数: 0

Regulatory effects of ectomycorrhizal fungi on the morphological construction of Pinus sylvestris var. mongolica seedlings under exogenous nitrogen input 外源氮输入下外生菌根真菌对蒙古松幼苗形态构建的调控作用

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-09 DOI: 10.1016/j.tfp.2025.101120

Suna Yun , Longfei Hao , Yongjie Yue , Tingyan Liu , Wenna Sun , Wanghuai Shi , Zhuyao Liu , Jiasheng Yu , Yongning Hu

This study investigated how ectomycorrhizal (ECM) fungal inoculation affects the rhizosphere microenvironment and growth of Pinus sylvestris var. mongolica seedlings under different nitrogen (N) addition levels. Results showed microbial diversity and biomass exhibited threshold responses to N. Under ECMF inoculation, low N (LN) increased bacterial diversity (Chao1 index +13.40 %) and microbial biomass phosphorus (+139.20 %), whereas high N (HN) only marginally increased diversity and decreased microbial biomass carbon (-41.4 %). LN inoculation also increased total soil C and P, alleviated microbial C limitation, and promoted seedling morphology (e.g., specific root length +58.97 %, seedling height +58.58 %). In contrast, HN inhibited root development and exacerbated the effects of N limitation. Without inoculation, HN resulted in higher bacterial diversity and soil nutrient content than did LN. Path analysis identified N addition and inoculation as key positive drivers of aboveground growth, with root morphology showing negative feedback. In conclusion, ECMF inoculation benefits seedling growth by enhancing microbial diversity and P availability under low N conditions, but high N causes CN imbalance and suppresses mycorrhizal benefits, providing theoretical support for mycorrhizal application in semi-arid areas under N deposition. Consequently, based on an identified threshold of ≈6 g·m⁻²·a⁻¹ for N addition, we recommend ECMF inoculation only under low-N conditions to ensure seedling morphological formation. This practice should be avoided under high-N conditions to prevent the loss of symbiotic benefits and a decline in ecological adaptability.

研究了不同施氮水平下外生菌根真菌接种对蒙古松根际微环境和幼苗生长的影响。结果表明，微生物多样性和生物量对氮呈阈值响应，接种ECMF时，低N （LN）使细菌多样性增加（Chao1指数+ 13.40%），微生物生物量磷增加（+ 139.20%），而高N （HN）仅略微增加多样性，微生物生物量碳减少（- 41.4%）。接种LN还能增加土壤总碳和磷，缓解微生物碳限制，促进幼苗形态（比根长+ 58.97%，苗高+ 58.58%）。相反，HN抑制了根系发育，加剧了氮素限制效应。在不接种的情况下，HN的细菌多样性和土壤养分含量高于LN。通径分析表明，施氮量和接种是地上部生长的主要正驱动因素，根系形态呈负反馈。综上所述，低氮条件下接种ECMF有利于幼苗生长，提高了微生物多样性和磷有效性，但高氮导致CN失衡，抑制菌根效益，为半干旱区N沉降条件下菌根施用提供理论支持。因此，根据确定的N添加阈值≈6 g·m⁻²·a⁻¹，我们建议仅在低N条件下接种ECMF以确保幼苗形态形成。在高氮条件下应避免这种做法，以防止共生效益的丧失和生态适应性的下降。

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引用次数: 0

Stumbling block or safety net? The impact of environmental income on relative poverty governance 绊脚石还是安全网？环境收入对相对贫困治理的影响

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-08 DOI: 10.1016/j.tfp.2025.101116

Jingyi Yang , Lijuan Zhu , Zhixi Cao , Wen Sun , Bin Yuan

" Living off mountains and seas," environmental income has long been a critical income source for low-income groups, though its role in relative poverty governance remains unclear. Using rural fixed observation data, taking forestry income with zero input costs as environmental income, and using the 3FGLS method to measure poverty vulnerability, this study examines how environmental income influences relative poverty alleviation. While high poverty-relapse-risk households earn less environmental income, it constitutes a larger share of their total income, indicating stronger dependency. Additionally, environmental income lowers rural poverty incidence, intensity, and depth. For relative poverty, it significantly reduces households' poverty levels, with results holding across multiple robustness tests. Further analysis reveals that during health or temporary income shocks, households increase environmental income share to mitigate liquidity constraints, acting as an income "safety net." Thus, in integrating ecological protection and poverty alleviation, policymakers should leverage environmental income's role in reducing inequality, preventing relapse, and alleviating relative poverty, ensuring low-income groups benefit from ecological resources while securing stable livelihoods.

“靠山靠海”的环境收入长期以来一直是低收入群体的重要收入来源，尽管它在相对贫困治理中的作用尚不清楚。本文利用农村固定观测数据，以投入成本为零的林业收入作为环境收入，采用3FGLS方法衡量贫困脆弱性，考察环境收入对相对扶贫的影响。虽然高贫困复发风险家庭的环境收入较少，但环境收入占其总收入的比例较大，表明依赖性较强。此外，环境收入降低了农村贫困的发生率、强度和深度。对于相对贫困，它显著降低了家庭贫困水平，结果在多个稳健性测试中都成立。进一步分析表明，在健康或暂时性收入冲击期间，家庭增加环境收入份额以缓解流动性限制，起到收入“安全网”的作用。因此，在生态保护与扶贫相结合的过程中，政策制定者应发挥环境收入在减少不平等、防止复发和减轻相对贫困方面的作用，确保低收入群体在获得稳定生计的同时受益于生态资源。

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引用次数: 0

Street greenery design strategies to mitigate urban heat islands using the 2D and 3D streetscape indices 利用2D和3D街景指数缓解城市热岛的街道绿化设计策略

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-08 DOI: 10.1016/j.tfp.2025.101111

Jiku Lee , Min Kim , Jinhyung Chon

Streetscapes consist of diverse spatial components from both 2D and 3D perspectives, which influence the urban thermal environment. In particular, the spatial composition of streets — including vegetation, buildings, roads, and open sky — plays a significant role in altering apparent temperature, a key indicator of thermal comfort. Therefore, this study proposes street greenery design strategies for mitigating urban heat islands by integrating both 2D and 3D streetscape indices based on spatial characteristics of streets. The Normalized Difference Vegetation Index (NDVI) and Normalized Difference Built-up Index (NDBI) were extracted from satellite imagery and utilized as 2D indices. In addition, Google Street View (GSV) images were processed through semantic segmentation to derive 3D indices, including green view index (GVI), building view index (BVI), road view index (RVI), and sky view index (SVI). The AT was employed to assess the thermal environment. The correlation value between NDVI and AT showed relatively high across the study area, indicating that the 2D vegetation distribution plays a significant role in cooling the street environment. However, the analysis also highlighted that the effect of streetscape elements on AT varied depending on the spatial characteristics and surrounding conditions of each street. This study suggests that street greenery design should be tailored to the specific context of streetscapes, considering both 2D and 3D spatial structures to maximize the cooling effect. The findings provide practical implications for urban planning and landscape design to enhance thermal comfort in rapidly warming cities.

从二维和三维的角度来看，街景是由不同的空间组成部分组成的，它们影响着城市热环境。特别是，街道的空间组成——包括植被、建筑、道路和开阔的天空——在改变表观温度（热舒适的关键指标）方面发挥着重要作用。因此，本研究基于街道的空间特征，结合二维和三维街景指数，提出缓解城市热岛的街道绿化设计策略。从卫星影像中提取归一化植被指数（NDVI）和归一化建筑指数（NDBI）作为二维指数。此外，对谷歌街景（GSV）图像进行语义分割处理，得到绿色景观指数（GVI）、建筑景观指数（BVI）、道路景观指数（RVI）和天空景观指数（SVI）等三维指数。热环境评价采用AT法。研究区NDVI与AT的相关值均较高，表明二维植被分布对街道环境降温作用显著。然而，分析也强调街景元素对交通效率的影响取决于每条街道的空间特征和周围条件。该研究建议，街道绿化设计应根据街景的具体背景进行定制，同时考虑二维和三维空间结构，以最大限度地提高降温效果。研究结果为快速变暖城市的城市规划和景观设计提供了实际意义。

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引用次数: 0

The state of sacred forests in West Cameroon 喀麦隆西部的神圣森林

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-07 DOI: 10.1016/j.tfp.2025.101105

Jessica Cyntia Gansonkeng Zambou , Verina Ingram , Georg Winkel , Francis Lelo Nzuzi , Lucie Temgoua

Sacred forests are forested areas associated with spiritual beliefs. In Africa, they serve as ritual and sacred sites with implications for biodiversity conservation. In West Cameroon, land use change has intensified with forests once classified as biodiversity hotspots becoming degraded and encroached by human activities. This study explores 24 sacred forests, examining changes in spatial areas, rates of change over time, and factors driving deforestation and degradation. Semi-structured questionnaires, focus group discussions, and cartographic mapping were used to gather data with Software ArcGIS version 2.18, ENVI, and SPSS employed for data analysis. Overall, there is a declining trend in forest cover between 1990 and 2023, on average 10.9 %, with a large variation between -0.6 % to -49 %. Degradation and deforestation drivers include agriculture (34 %) and unsustainable non-timber forest product and woodfuel harvesting (31 %). Religion (89 %) and eroded customary governance (11 %) are indirect drivers, as traditional authority decreases and customary spiritual beliefs that previously maintained the forests are replaced by Christian and Islamic values in which sacred forest use and protection plays no role. Given decreases in area, quality and status of sacred forests, despite their continued importance for many communities and traditions, and their contribution to in-situ biodiversity conservation, we recommend integrating sacred forests into broader land-use planning and conservation policies at local, regional and national levels, promoting sustainable harvesting of forest products, strengthening traditional governance systems and connecting them to statutory forest policies, and enhanced transmission of the cultural and spiritual values associated with these forests.

神圣的森林是与精神信仰有关的森林区域。在非洲，它们是仪式和圣地，具有保护生物多样性的意义。在喀麦隆西部，土地利用变化加剧，曾经被列为生物多样性热点的森林正在退化，并受到人类活动的侵占。本研究探索了24片圣林，考察了其空间区域的变化、随时间的变化率以及导致森林砍伐和退化的因素。采用半结构化问卷调查、焦点小组讨论、地图学制图等方法收集数据，采用ArcGIS 2.18、ENVI软件，SPSS软件进行数据分析。总体而言，1990年至2023年期间森林覆盖率呈下降趋势，平均下降10.9%，变化幅度在- 0.6%至- 49%之间。退化和森林砍伐的驱动因素包括农业（34%）和不可持续的非木材林产品和木材燃料采伐（31%）。宗教（89%）和被侵蚀的习惯治理（11%）是间接驱动因素，因为传统权威减少，以前维持森林的习惯精神信仰被基督教和伊斯兰价值观所取代，神圣的森林使用和保护不起任何作用。鉴于神林的面积、质量和地位不断下降，尽管它们对许多社区和传统仍然很重要，并对当地生物多样性保护做出了贡献，我们建议将神林纳入地方、区域和国家各级更广泛的土地利用规划和保护政策，促进森林产品的可持续采伐，加强传统治理体系，并将其与法定森林政策联系起来。加强与这些森林有关的文化和精神价值的传播。

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引用次数: 0

The influence of urban forest on stress levels among adults aged 45 and older: An environmental and socioeconomic analysis in Florida, US 城市森林对45岁及以上成年人压力水平的影响：美国佛罗里达州的环境和社会经济分析

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-07 DOI: 10.1016/j.tfp.2025.101118

Christy Cecilia Veronica Suhendy , Andrew K. Koeser , Ryan W. Klein , Laura Warner , Matilda van den Bosch , Gail Hansen

Mental health benefits associated with urban nature exposure have gained significant research attention. This study explored the relationships between self-reported stress levels in Florida (US) residents aged 45 and older and sociodemographic, behavioral, and environmental predictors related to urban forest access. Specifically, we used the 3–30–300 rule as a contextual framework which states that all urban residents should have at least three trees visible from their home, 30% neighborhood canopy cover, and one green space for recreation within 300 meters of their home. Sociodemographic factors such as age and income significantly influenced stress, with older individuals and those who are financially comfortable reporting lower stress levels. Environmental variables, such as tree canopy cover and the number of trees near residences were not significantly associated with stress. However, the frequency of green space visits demonstrated a significant impact. Daily time spent in natural areas significantly reduced stress, with weekly visits also linked to lower stress levels, whereas infrequent visits, such as only a few times a year, were associated with higher stress, underscoring the importance of regular interaction with nature. These findings suggest that the frequency of green space visits may play a more critical role in stress reduction than the mere presence of urban greenery, at least in the context of Florida residents aged 45 and older using self-reported measures of tree exposure and stress levels. Policymakers and urban planners should prioritize enhancing access to high-quality, safe, and engaging green spaces to promote mental health. Future research should investigate the mechanisms driving these relationships and evaluate the long-term impacts of green space engagement on well-being.

接触城市自然对心理健康的益处已经引起了大量的研究关注。本研究探讨了美国佛罗里达州45岁及以上居民自我报告的压力水平与城市森林通道相关的社会人口、行为和环境预测因素之间的关系。具体来说，我们使用3-30-300规则作为语境框架，该框架规定所有城市居民应从家中至少看到三棵树，30%的社区树冠覆盖，以及在其家300米范围内的一个绿色休闲空间。年龄和收入等社会人口因素对压力有显著影响，老年人和经济状况较好的人报告的压力水平较低。环境变量，如树冠覆盖度和住宅附近的树木数量与压力没有显著相关。然而，访问绿地的频率显示出显著的影响。每天在自然环境中度过的时间大大减少了压力，每周访问也与较低的压力水平有关，而不频繁的访问，例如一年只有几次，与较高的压力有关，强调了定期与自然互动的重要性。这些研究结果表明，至少在佛罗里达州45岁及以上的居民使用树木暴露和压力水平自我报告的测量方法的背景下，绿地访问的频率可能比城市绿化的存在在减轻压力方面发挥更重要的作用。政策制定者和城市规划者应优先考虑增加获得高质量、安全和吸引人的绿色空间的机会，以促进心理健康。未来的研究应该调查驱动这些关系的机制，并评估绿色空间参与对幸福感的长期影响。

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引用次数: 0

Estimation of above-ground carbon storage in urban green space trees incorporating crown volume structural parameters 基于树冠体积结构参数的城市绿地树木地上碳储量估算

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-06 DOI: 10.1016/j.tfp.2025.101117

Jianpeng Zhang , Yuncheng Deng , Jinliang Wang , Rafael Antonio Chaparro Torres , Jie Li , Jiya Pan , Feng Cheng , Cheng Wang

Urban green spaces play a vital role in carbon sequestration and climate regulation. This study estimates the above-ground carbon (AGC) storage of urban trees in Chenggong District, Kunming City, using airborne laser scanning (ALS) point cloud data and GF-2 satellite imagery. Two primary objectives were addressed: (1) An above-ground biomass (AGB) estimation model for urban trees was developed by incorporating crown volume. The model, constructed using the XGBoost algorithm with tree height, diameter at breast height (DBH), and crown volume as predictors, incorporating crown volume significantly improved accuracy, with the R² of the training set increasing from 0.793 to 0.932 and the test set from 0.807 to 0.856. (2) The model was then applied to estimate spatially explicit AGC storage across the built-up area. Results show a total AGB of approximately 4.51×10⁴ t, AGC storage of 2.26×10⁴ t, and a mean carbon density of 6.69 kg/m². Wujaying and Yuhua subdistricts were identified as AGC storage hotspots. Furthermore, the study found that traditional vegetation indices and texture features had limited effectiveness in indicating individual tree AGB under high-resolution imagery. A rapid AGC estimation workflow integrating LiDAR and optical remote sensing was established, providing robust technical support for urban carbon sink assessment and ecological planning.

城市绿地在固碳和调节气候方面发挥着重要作用。利用机载激光扫描（ALS）点云数据和GF-2卫星影像，估算了昆明市呈贡区城市树木的地上碳储量。研究的两个主要目标是：(1)建立了城市树木地上生物量（AGB）估算模型。采用XGBoost算法，以树高、胸径（DBH）和树冠体积为预测因子，结合树冠体积构建的模型显著提高了准确率，训练集的R²从0.793提高到0.932，测试集的R²从0.807提高到0.856。(2)将该模型应用于估算建成区的空间显式AGC存储。结果表明，总AGB约为4.51×104 t， AGC储量为2.26×104 t，平均碳密度为6.69 kg/m2。吴家营和玉华街道被确定为AGC储存热点。此外，研究发现，传统的植被指数和纹理特征在高分辨率图像下对单树AGB的指示效果有限。建立了激光雷达与光学遥感相结合的AGC快速估算流程，为城市碳汇评估和生态规划提供了有力的技术支撑。

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引用次数: 0

Comparative study of woody species diversity, composition, structure and aboveground biomass carbon stock of Jello Muktar Dry Afromontane Forest with adjacent agroforestry, Southeastern Ethiopia 埃塞俄比亚东南部Jello Muktar干旱林与邻近农林业木本物种多样性、组成、结构及地上生物量碳储量的比较研究

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-05 DOI: 10.1016/j.tfp.2025.101110

Hanbesa Hashim , Zerihun Asrat , Muktar Mohammed , Mesele Negash

Reduction in plant species diversity, influences the potential of carbon stocks in a given land use. The forest are disappearing at an alarming rate in the tropics, so the role of agroforestry (AF) as a conservation tool and carbon sequestration needs to be further explored by comparing with forests. Thus, the aims of this study was to evaluate and compare woody species diversity, Composition, Structure and above ground biomass (AGB) carbon stock of Jello Muktar Dry Afromontane forest (JMF) and its adjacent AF. Dataset from forest inventory (n = 30), undertaken in JMF was used. For AF forty sample plots with 20 m × 20 m were sampled with stratified systematic sampling techniques. Woody species diversity analysis were carried out using Shannon Weiner Diversity index (H'), Simpson diversity (D) and Evenness index (J) whereas, similarity was carried out using Sørensen coefficient of similarity (Ss) index respectively. General and species or site specific allometric equations were used to calculate the AGB. A total of 74 woody species belonging to 47 families were recorded across the two land uses. The species similarity index between the two studied land uses was low (17.65%). The independent samples test indicated higher values of H' (3.20), D (0.95), and J (0.95) indices in JMF compared to the adjacent AF values of H' (2.09), D (0.83), and J (0.80). However, no statistically significant difference (p < 0.05) was observed for the H' index between JMF and AF. AGB carbon stock was significantly (p<0.05) higher in JMF than and its adjacent AF. There was a positive relationship between diversity and carbon stock in the two studied land uses. The study revealed that preserving forests for both biodiversity and climate change mitigation is vital along with the complementary role AF to buffer the forest.

植物物种多样性的减少会影响特定土地利用中碳储量的潜力。热带地区的森林正在以惊人的速度消失，因此需要通过与森林的比较，进一步探索农林业作为保护工具和碳封存的作用。因此，本研究的目的是评估和比较Jello Muktar干旱林（JMF）及其邻近干旱林（JMF）的木本物种多样性、组成、结构和地上生物量（AGB）碳储量。数据来源于JMF进行的森林清查（n = 30）。采用分层系统抽样技术，对40块面积为20 m × 20 m的样地进行抽样。采用Shannon Weiner多样性指数（H′）、Simpson多样性指数(D)和均匀度指数(J)对木本物种进行多样性分析，采用Sørensen相似系数（Ss）指数对相似度进行分析。采用一般异速生长方程和种址特异异速生长方程计算AGB。两种土地利用方式共记录到47科74种木本植物。两种土地利用方式的物种相似性指数较低（17.65%）。独立样本检验表明，JMF的H′（3.20）、D（0.95）和J（0.95）指数高于相邻的H′（2.09）、D（0.83）和J（0.80）的AF值。但JMF与AF的H′指数差异无统计学意义（p<0.05）。JMF的AGB碳储量显著高于相邻AF （p<0.05）。两种土地利用的多样性与碳储量呈正相关。该研究表明，保护森林对生物多样性和减缓气候变化至关重要，同时森林在缓冲森林方面也具有补充作用。

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引用次数: 0

Increased arbuscular mycorrhizal tree dominance exacerbates soil microbial phosphorus limitation in a subtropical secondary forest: Evidence from ecoenzymatic stochiometry 丛枝菌根树优势增加加剧了亚热带次生林土壤微生物磷限制：来自生态酶计量学的证据

IF 2.9 Q1 FORESTRY

Trees, Forests and People

Pub Date : 2025-12-05 DOI: 10.1016/j.tfp.2025.101112

Zi-Yin Wang , Fu-Xi Shi , Xiao-Min Luo , Yi Qin , Hui-Ping Li , Yun Zhang , Ting Wu , Rong Mao

Tree mycorrhizal association is a key determinant of soil microbial resource limitation in forests. However, how altered dominant tree mycorrhizal associations changes soil microbial resource limitation remains unclear in sub/tropical forests. Here, we measured soil cellobiohydrolase (CB), β-1,4-glucosidase (BG), leucine aminopeptidase (LAP), β-1,4-N-acetylglucosaminidase (NAG), and acid phosphatase (AP) activities, microbial biomass, and nutrient availability at 0–10 cm and 10–30 cm depths along the gradients of arbuscular mycorrhizal (AM) tree dominance (3 %∼99 %) in a subtropical forest of China, and used ecoenzymatic stochiometry to clarify the shift in soil microbial resource limitation with increasing AM tree dominance. At each depth, increasing AM tree dominance reduced soil carbon:nitrogen ratio and phosphorus availability but increased soil fungal biomass and nitrogen:phosphorus ratio. Soil CB, BG, LAP, and NAG activities declined, whereas AP activity remained unchanged with increasing AM tree dominance. Irrespective of soil depth, ln(CB+BG)/ln(AP) and ln(LAP+NAG)/ln(AP) decreased linearly with elevating AM tree dominance, whereas vector angle increased with increasing AM tree dominance. Collectively, these shifts in ecoenzymatic stoichiometry indicate an intensification of microbial P limitation with increasing AM tree dominance. In addition, ln(CB+BG)/ln(AP), ln(LAP+NAG)/ln(AP), and vector angle exhibited significant relationships with soil carbon:nitrogen and nitrogen:phosphorus ratios. These findings suggest that increased AM tree dominance exacerbates microbial phosphorus limitation, which would provide insights into the consequences of shifted vegetation composition on nutrient cycling and limitation in subtropical forests.

树木菌根结合力是森林土壤微生物资源限制的关键决定因素。然而，在亚热带森林中，优势树木菌根关联的改变如何改变土壤微生物资源限制尚不清楚。在这里，我们测量了中国亚热带森林土壤纤维生物水解酶（CB）、β-1,4-葡萄糖苷酶（BG）、亮氨酸氨基肽酶（LAP）、β-1,4- n -乙酰氨基葡萄糖苷酶（NAG）和酸性磷酸酶（AP）活性、微生物生物量和养分有效性，并沿着丛枝菌根（AM）树优势度（3% ~ 99%）的梯度测量了0-10 cm和10-30 cm深度的土壤微生物资源限制随着AM树优势度的增加而变化。在不同深度，AM树优势度的增加降低了土壤碳氮比和磷有效性，但增加了土壤真菌生物量和氮磷比。随着AM树优势度的增加，土壤CB、BG、LAP和NAG活性下降，而AP活性保持不变。与土壤深度无关，随着AM树优势度的增加，ln(CB+BG)/ln（AP）和ln(LAP+NAG)/ln（AP）呈线性下降，而矢量角随着AM树优势度的增加而增加。总的来说，这些生态酶化学计量学的变化表明微生物磷限制随着AM树优势度的增加而增强。此外，ln(CB+BG)/ln（AP）、ln(LAP+NAG)/ln（AP）和向量角与土壤碳氮比和氮磷比呈显著相关。这些结果表明，AM树优势度的增加加剧了微生物磷的限制，这将有助于了解植被组成变化对亚热带森林养分循环和限制的影响。

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引用次数: 0