Differential magnitude of rhizosphere effects on soil aggregation at three stages of subtropical secondary forest successions
Differential magnitude of rhizosphere effects on soil aggregation at three stages of subtropical secondary forest successions
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亚热带次生林演替三个阶段根际对土壤团聚影响的差异程度
DOI：
10.1007/s11104-019-03935-z
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发表时间：
2019-03
期刊：
影响因子：
4.9
通讯作者：
Bai Shahla Hosseini
中科院分区：
文献类型：
--
作者：
Liu Ruiqiang;Zhou Xuhui;Wang Jiawei;Shao Junjiong;Fu Yuling;Liang Chao;Yan Enrong;Chen Xiaoyong;Wang Xihua;Bai Shahla Hosseini
根及其根际环境通过调节土壤团聚体的形成和稳定，对土壤结构产生重要影响。本研究旨在探讨根际土壤团聚体的影响，并探讨潜在的机制沿着次生林successives.MethodsEffects的根和根际土壤团聚体在两个亚热带次生林演替进行了研究，通过分离土壤根际和散装土壤。土壤团聚体的平均重量直径（MWD），土壤有机碳（SOC），土壤养分，细根characteristics.ResultsSoil团聚体的MWD增加显着的散装土壤沿着次生林演替，但根际土壤没有差异。土壤微球对土壤团聚体MWD的影响（即，根际土壤与非根际土壤之间的根诱导差异）在低肥力亚热带森林演替早期显著高于高肥力亚热带森林演替后期。在整个次生林演替过程中，降雨圈显著增加了土壤有机碳和土壤全氮，且与土壤团聚体相对分子质量分布呈非线性相关。主成分回归分析表明，土壤有机碳是主要的非生物因子，与土壤团聚体MWD呈正相关。在生物因子中，细根长密度和氮浓度是影响土壤团聚体稳定性的两个重要根系性状。一个改进的概念框架被开发出来，以促进我们对土壤团聚和根际效应的理解，突出了土壤肥力的作用（即，SOC和速效养分），根系性状，林龄对土壤团聚体的驱动作用。结论亚热带森林演替早期，根源有机物输入根际对土壤团聚体的影响大于演替后期。根际效应的这种演替特异性模式主要是由于土壤团聚体MWD与SOC浓度之间的非线性关系，在高SOC时具有平台效应。将SOC依赖的根际效应纳入地球系统模型，将有助于提高森林土壤C动态的预测水平。
Background and aimsRoots and their rhizosphere considerably influence soil structure by regulating soil aggregate formation and stabilization. This study aimed to examine the rhizosphere effects on soil aggregation and explore potential mechanisms along secondary forest successions.MethodsEffects of roots and their rhizosphere on soil aggregation in two subtropical secondary forest successions were examined by separating soils into rhizosphere and bulk soils. Soil aggregate mean weight diameter (MWD), soil organic carbon (SOC), soil nutrients, and fine-root traits were simultaneously measured.ResultsSoil aggregate MWD increased significantly in the bulk soils along secondary forest successions, but did not differ in the rhizosphere soils. Rhizosphere effects on soil aggregate MWD (i.e., root-induced differences between the rhizosphere and bulk soils) were thus significantly higher at the early-successional stage of subtropical forest with low soil fertility than those at the late stages with high fertility. Rhizosphere significantly increased SOC and soil total nitrogen (TN) throughout the entire secondary forest successions, which was nonlinearly correlated with soil aggregate MWD. Principal components regression analysis showed that SOC was the primary abiotic factor and positively correlated with soil aggregate MWD. As for biotic factors, fine-root length density and N concentration were two important root traits having significant effects on soil aggregate stability. An improved conceptual framework was developed to advance our understanding of soil aggregation and rhizosphere effects, highlighting the roles of soil fertility (i.e., SOC and available nutrients), root traits, and forest age in driving soil aggregation.ConclusionsImpacts of root-derived organic compounds inputs to rhizosphere on soil aggregation were stronger at the early-successional stage of subtropical forest than those at the late stages. This succession-specific pattern in rhizosphere effects largely resulted from the nonlinear relationships between soil aggregate MWD and SOC concentration with a plateau at high SOC. Incorporating the SOC-dependent rhizosphere effects on biogeochemical cycle into Earth system models might improve the prediction of forest soil C dynamics.
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中国东部亚热带森林次生演替过程中土壤净氮矿化和硝化的时间格局
影响因子：
4.9
作者：
Wang, Xi-Hua;Guo, Ming;Li, Yong-Fu;Zhou, Wu;Yan, En-Rong;Zhong, Qiang
通讯作者：
Zhong, Qiang
影响因子：
9.7
作者：
B. Zhu;B. Zhu;J. Gutknecht;J. Gutknecht;D. Herman;D. Keck;D. Keck;M. Firestone;W. Cheng
通讯作者：
B. Zhu;B. Zhu;J. Gutknecht;J. Gutknecht;D. Herman;D. Keck;D. Keck;M. Firestone;W. Cheng
DOI：
10.1111/nph.13045
发表时间：
2015-03
期刊：
The New phytologist
影响因子：
--
作者：
M. Rillig;C. Aguilar‐Trigueros;Joana Bergmann;E. Verbruggen;S. Veresoglou;A. Lehmann
通讯作者：
M. Rillig;C. Aguilar‐Trigueros;Joana Bergmann;E. Verbruggen;S. Veresoglou;A. Lehmann
影响因子：
6.1
作者：
Ai, Chao;Liang, Guoqing;Zhou, Wei
通讯作者：
Zhou, Wei
影响因子：
9.4
作者：
McCormack, M. Luke;Adams, Thomas S.;Eissenstat, David M.
通讯作者：
Eissenstat, David M.