作 者：Shi, PengQin, YanliLiu, QiZhu, TiantianLi, ZhanbinLi, PengRen, ZongpingLiu, YingWang, Feichao
作者机构：State Key Laboratory of Eco-hydraulics in Northwest Arid RegionXi'an University of Technology Xi'an710048 ChinaKey Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid RegionsXi'an710048 ChinaTianshui Soil and Water Conservation Experimental StationTianshui741000 ChinaCollege of ArchitectureXi'an University of Architecture and Technology Xi'an710043 China
出 版 物：《Science of the Total Environment》
年 卷 期：2020年第707卷
基 金：This work was supported by the National Key Research and Development Program of China (Grant 2017YFC0504704 )National Natural Science Foundation of China (Grant 41601092 )National Geological Prospecting special (Grant DD20190504 )Shaanxi Provincial Technology Innovation Guidance Project (Grant 2017CGZH-HJ-06 ) and the Shaanxi Province Innovation Talent Promotion Project Technology Innovation Team (Grant 2018TD-037 ). Appendix A
主 题：SoilsAtmospheric chemistryCarbon dioxideDroughtEcosystemsForestryLand useLandformsRestorationRevegetationSedimentsSoil conservationVegetationAtmospheric carbon dioxideCarbon sourceGrain for greensSeasonal variationSoil respiration ratesTerrestrial ecosystemsVegetation restorationZhifanggou watershed
摘 要：Soil respiration is a large carbon flux from terrestrial ecosystems to the atmosphere, and small variations in soil respiration can prominently influence the global carbon (C) cycle. The vegetation changes could directly affect soil respiration. The large-scale Grain for Green project carried out on the Loess Plateau, China has importantly affected the contribution of soil respiration to atmospheric carbon dioxide (CO2). Therefore, it is important to study the effects of vegetation restoration on soil respiration. We selected four land-use types: crop, forest, shrub, and grassland in the Zhifanggou watershed to analyze variation in soil respiration during dry and rainy seasons. Furthermore, the source of CO2 emissions from soil respiration was identified using isotopes. The results showed that soil respiration in the rainy season was significantly higher than that in the dry season (P −2 s−1) cropland (0.72 μmol m−2 s−1) forestland (0.44 μmol m−2 s−1) grassland (0.33 μmol m−2 s−1). However, grass and forestland had significantly higher soil respiration than shrub and cropland in the rainy season (P 70% of CO2 emissions. Following revegetation, litter contributed more to soil respiration than roots or soil microorganisms at 68% of soil respiration. Our results provide a theoretical basis for assessing C balance in terrestrial ecosystems. © 2019 Elsevier B.V.