Coupled of carbon and nitrogen mineralization in rhizosphere soils along a temperate forest altitudinal gradient
Coupled of carbon and nitrogen mineralization in rhizosphere soils along a temperate forest altitudinal gradient
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温带森林海拔梯度根际土壤碳氮矿化的耦合
DOI：
10.1007/s11104-022-05611-1
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Weixin Cheng
中科院分区：
文献类型：
--
作者：
Changfu Huo;Jiayu Lu;Liming Yin;Peng Wang;Weixin Cheng
目的根际是陆地生态系统中土壤碳和氮生物地球化学循环的热点。然而，根际土壤中土壤碳和氮矿化之间的相互作用仍然知之甚少。本研究旨在大规模确定根际土壤和大块土壤中土壤碳氮矿化之间的相互作用。方法采用“摇动后细根附着土壤”的方法，沿森林海拔梯度收集成对的根际土壤和大块土壤。土壤碳矿化率（Cmin）和净氮矿化率（Nmin）是通过实验室培养测定的。结果我们发现，在不同地点的根际土壤中，Cmin和Nmin之间存在显着的正相关关系，而在大块土壤中，Cmin与Nmin不相关。此外，使用结构方程模型，土壤性质、微生物生物量 C (MBC) 和细胞外酶活性显示出影响 Cmin 和 Nmin 的重要路径。根际土壤中Cmin和Nmin的耦合可能是由根-土相互作用触发的，导致MBC、土壤总有机碳、土壤总氮和细胞外酶活性水平较高。相比之下，大块土壤中 Cmin 和 Nmin 的解耦可能归因于 MBC 和细胞外酶活性水平较低。结论我们的结果表明，土壤 C 和 N 矿化在根际而不是大块土壤中耦合。这些结果表明，根际土壤碳和氮循环之间的相互作用可能与土壤中的不同。
AimsRhizosphere is a hotspot for soil C and N biogeochemical cycling in terrestrial ecosystems. However, the interaction between soil C and N mineralization remain poorly understood in the rhizosphere soils. This study aimed to identify interactions between soil C and N mineralization in rhizosphere soils and bulk soils at a large scale.MethodsWe used the “soil adhering to fine roots after shaking” method to collect paired rhizosphere soils and bulk soils along an altitudinal forest gradient. Soil C mineralization rates (Cmin) and net N mineralization rates (Nmin) were determined with laboratory incubation.ResultsWe found a significantly positive relationship between Cmin and Nmin in the rhizosphere soils across sites, whereas Cmin was not correlated with Nmin in the bulk soils. Furthermore, soil properties, microbial biomass C (MBC) and extracellular enzyme activities showed substantial paths affecting Cmin and Nmin using structural equation model. The coupling of Cmin and Nmin in rhizosphere soils could be triggered by root-soil interactions, resulting in the higher level of MBC, total organic C of soil, total N of soil, and extracellular enzyme activities. By contrast, the decoupling of Cmin and Nmin in the bulk soils might be attributed to the lower level of MBC and extracellular enzyme activities.ConclusionsOur results demonstrated that soil C and N mineralization coupled in the rhizosphere rather than in the bulk soils. These results suggest that the interaction between soil C and N cycling in rhizosphere are likely to differ from that in bulk soil.
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