黑河流域土地利用变化对土壤有机碳和全氮储量的影响——元分析（英文）

编号 zgly0001675839

文献类型 期刊论文

文献题名 黑河流域土地利用变化对土壤有机碳和全氮储量的影响——元分析（英文）

作者 仝金辉  胡锦华  陆峥  孙浩然  杨晓帆 

作者单位 StateKeyLaboratoryofEarthSurfaceProcessesandResourceEcology  FacultyofGeographicalScience  BeijingNormalUniversity 

母体文献 Journal of Geographical Sciences 

年卷期 2019年09期

年份 2019 

分类号 S153.6 

关键词 HeiheRiverBasin  LUCC  meta-analysis  soilorganiccarbon  totalnitrogen 

文摘内容 Land use and cover change(LUCC) is an important indicator of the human-earth system under climate/environmental change, which also serves as a key impact factor of carbon balance, and a major source/sink of soil carbon cycles. The Heihe River Basin(HRB) is known as a typical ecologically fragile area in the arid/semi-arid regions of northwestern China, which makes it more sensitive to the LUCC. However, its sensitivity varies in a broad range of controlling factors, such as soil layers, LUCCs and calculation methods(e.g. the fixed depth method, FD, and the equivalent mass method, ESM). In this study, we performed a meta-analysis to assess the response of soil organic carbon(SOC) and total nitrogen(TN) storage to the LUCC as well as method bias based on 383 sets of SOC data and 148 sets of TN data from the HRB. We first evaluated the calculation methods and found that based on the FD method, the LUCC caused SOC and TN storage to decrease by 17.39% and 14.27%, respectively; while the losses estimated using the ESM method were 19.31% and 18.52%, respectively. The deviations between two methods were mainly due to the fact that the FD method ignores the heterogeneity of soil bulk density(BD), which may underestimate the results subsequently. We then analyzed the response of SOC and TN storage to various types of the LUCC. In particular, when woodland and grassland were converted into cultivated land or other land types, SOC and TN suffered from heavy losses, while other LUCCs had minor influences. Finally, we showed that increasing the depth of the soil layers would reduce the losses of SOC and TN storage. In summary, we identified a series of controlling factors(e.g. soil layer, the LUCC and calculation method) to evaluate the impact of the LUCC on SOC and TN storage in the HRB, which should be considered in future research.