Responses of soil carbon and nitrogen cycles to the physical influences of rock fragment in soils
Responses of soil carbon and nitrogen cycles to the physical influences of rock fragment in soils
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土壤碳氮循环对土壤中碎石物理影响的响应
DOI：
10.1016/j.catena.2021.105369
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发表时间：
2021-08
期刊：
影响因子：
6.2
通讯作者：
Zhu Qing
中科院分区：
文献类型：
--
作者：
Lai Xiaoming;Zhou Zhiwen;Liao Kaihua;Zhu Qing
岩石碎块（RF，直径> 2 mm的矿物颗粒）可以通过不同的物理机制对土壤碳（C）和氮（N）循环产生显著影响。这些物理机制包括通过降低细土容重（vSHBD）和体积（vSHVo）来改变土壤水力参数（vSH），通过降低细土容重（vCNBD）和体积（vCNVo）来影响土壤C和N储量（vCN），以及通过增加细土C和N浓度（vCNCo）来影响土壤C和N储量。本文基于中国典型丘陵区的土壤和气候数据，通过考虑这些物理机制构建情景，研究了DNDC和DayCent模型中关键土壤C和N输出（CO2、N2 O和N2 O排放以及N淋溶）对RF含量（RFC）的响应。结果表明，当考虑vSH和vCN时，观察到这些土壤C和N输出与RFC之间的抛物线关系，最大值在RFC = 0.3-0.6 g g−1。vCN主导了土壤CO2排放对RFC的响应，而vSH对土壤N2 O排放和N淋溶的响应具有一定的贡献。当只考虑vSH时，vSHBD和vSHVo在DNDC模型中的贡献相反，vSHBD的贡献大于vSHVo的贡献。然而，在DayCent模型中，vSHVo占主导地位。当仅考虑vCN时，vCNCo主导这些响应，尽管在高RFC下出现了vCNBD和vCNVo的相当大的叠加影响。DNDC和DayCent模型对RFC响应的差异可能是由于模拟土壤水文、土壤地球化学和容重在这些模型中的作用的模型复杂性不同。相对而言，DNDC模型的反应更为明显。这些发现可以扩展我们对RF和土壤C和N循环的理解。
Rock fragments (RFs, mineral particles with diameter > 2 mm) can substantially influence soil carbon (C) and nitrogen (N) cycles through different physical mechanisms. These physical mechanisms include changing soil hydraulic parameters (vSH) by reducing fine earth bulk density (vSHBD) and volume (vSHVo), and affecting soil C and N stocks (vCN) by reducing fine earth bulk density (vCNBD) and volume (vCNVo), and increasing fine earth C and N concentrations (vCNCo). In this study, based on soil and climate data in a typical hilly area of China, we construct scenarios by considering these physical mechanisms to investigate the responses of key soil C and N outputs (carbon dioxide or CO2, and nitrous oxide or N2O emissions, and N leaching) to RF content (RFC) in DNDC and DayCent models. Results showed that when considering vSH and vCN, parabolic relationships were observed between these soil C and N outputs and RFC, with maximum in RFC = 0.3–0.6 g g−1. The vCN dominated the responses of soil CO2emission to RFC, while vSH exerted comparative contributions to the responses of soil N2O emission and N leaching. When only considering vSH, opposite contributions of vSHBD and vSHVo were observed in DNDC model, and contributions of vSHBD overwhelmed those of vSHVo. However, vSHVo dominated these responses in DayCent model. When only considering vCN, the vCNCo dominated these responses, though considerable superimposed influences of vCNBD and vCNVo appeared under high RFC. The discrepancies between these responses to RFC in DNDC and DayCent models might be due to the different model complexities in simulating soil hydrology, biogeochemistry, and the role of bulk density in these models. Relatively, more distinct responses were achieved in DNDC model. These findings can extend our understandings of RFs and soil C and N cycles.
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影响因子：
6.4
作者：
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通讯作者：
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影响因子：
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