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Drivers of tree demographic trade-offs in a temperate forest

Forest Ecosystems 2022年第4期9卷 475-482页

作者： Jianghuan Qin Chunyu Fan Yan Geng Chunyu Zhang Xiuhai Zhao Lushuang Gao Research Center of Forest Management Engineering of State Forestry and Grassland Administration Beijing Forestry UniversityBeijing100083China

Background: The demographic trade-offs(i.e. growth and survival) play important roles in forest dynamics and they are driven by multiple factors, including species’ inherent life-history strategies(such as shade-tolerance and mycorrhizal type), neighborhood interactions(such as conspecific negative density dependence, CNDD), and abiotic environment pressures. Although studies found that CNDD occurred in tropical and temperate forest,attempts to identify how the variations in CNDD control their impacts on growth and survival remain debate. In the present study, we conducted an extensive field survey, and analyzed demographic rates from 24 co-occurring temperate tree species, in order to test the importance of CNDD in shaping the growth-survival ***: Our study found that density dependence and environmental filtering were strong predictors for individual growth-survival trade-offs, while they showed variations across shade-intolerant and ectomycorrhizal species, as well as saplings and juveniles with more negative CNDD. Species growth showed positive relationship with mortality. And our results also support the fact that CNDD drives species growth-survival trade-offs at the community level with environmental ***: Our study indicates that biotic interactions such as density dependence and environment filtering played an important role in growth-survival trade-offs, and confirmed that the Janzen-Connell hypothesis in temperate forest was associated with species life-history strategies. In addition, shade-tolerance, mycorrhizal type and life-stage of forest species responded differently to CNDD, thus providing insights regarding different community assembly mechanisms and their interactions. Therefore, it is important to take species survival with growth and species life-history strategies into account when focusing on forest dynamics.

关键词： Tree survival Density dependence Growth-survival trade-offs life-history strategy Temperate forest

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Effects of core soil microbial taxa on soil carbon source utilization under different long-term fertilization treatments in Ultisol

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Soil Ecology Letters 2024年第4期6卷 137-148页

作者： Haoran Mao Guilong Li Ke Leng Luyuan Sun Kailou Liu Yongxin Lin Jia Liu Xingjia Xiang Soil and Fertilizer&Resources and Environment Institute Jiangxi Academy of Agricultural SciencesNanchang 330200China Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration School of Resources and Environmental EngineeringAnhui UniversityHefei 230601China Jiangxi Institute of Red Soil and Germplasm Resources Nanchang 331717China Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education School of Geographical SciencesFujian Normal UniversityFuzhou 350007China

Core taxa play an important role in regulating soil carbon *** cluster with oligotrophic made key contributions to soil carbon *** cluster characteristics link microorganisms to carbon *** the ecological roles of core soil microbial species in soil carbon metabolism is critically important for enhancing carbon sequestration in agricultural systems;however,no studies to date have determined the effects of core soil microbial taxa on carbon metabolism under various long-term fertilization ***,we collected soil samples from field plots that had been subjected to different fertilization practices for nearly 30 years and examined the long-term effects of fertilization on the preferences of core soil bacterial taxa for different carbon *** also examined the relative contribution of core soil bacterial taxa in utilization of different carbon source types in Biolog Eco ***-term fertilization treatment had a significant effect on soil properties and bacterial community *** core taxa were closely related to soil carbon source *** co-occurrence network showed that the major ecological clusters containing core taxa made key contributions to soil carbon source *** organic fertilization increased the abundance of a core cluster with a low weighted average rrn copy *** ecological cluster was the most important factor affecting soil carbon source utilization even among soil physicochemical factors *** findings indicate that core taxa characterized by oligotrophic bacteria have a major effect on carbon source utilization in Ultisols.

关键词： core taxa long-term fertilization life-history strategy agricultural ecosystems sequencing

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