作者
Qiong Chen,Chunyan Long,Jingwen Chen,Xiaoli Cheng
摘要
Abstract Land use change specially affects greenhouse gas (GHG) emissions, and it can act as a sink/source of GHGs. Alterations in edaphic properties and microbial attributes induced by land use change can individually/interactively contribute to GHG emissions, but how they predictably affect soil CO 2 , CH 4 , and N 2 O emissions remain unclear. Here, we investigated the direct and indirect controls of edaphic properties (i.e., dissolved organic carbon [DOC], soil organic C, total nitrogen, C:N ratio, ‐N, ‐N, soil temperature [ST], soil moisture [SM], pH, and bulk density [BD]) and microbial attributes (i.e., total phospholipid fatty acids [PLFAs], 18:1ω7c, nitrifying genes [ammonia‐oxidizing archaea, ammonia‐oxidizing bacteria], and denitrifying genes [ nirS , nirK , and nosZ ]) over the annual soil CO 2 , CH 4 , and N 2 O emissions from the woodland, shrubland, and abandoned land in subtropical China. Soil CO 2 and N 2 O emissions were higher in the afforested lands (woodland and shrubland) than in the abandoned land, but the annual cumulative CH 4 uptake did not significantly differ among all land use types. The CO 2 emission was positively associated with microbial activities (e.g., total PLFAs), while the CH 4 uptake was tightly correlated with soil environments (i.e., ST and SM) and chemical properties (i.e., DOC, C:N ratio, and ‐N concentration), but not significantly related to the methanotrophic bacteria (i.e., 18:1ω7c). Whereas, soil N 2 O emission was positively associated with nitrifying genes, but negatively correlated with denitrifying genes especially nosZ . Overall, our results suggested that soil CO 2 and N 2 O emissions were directly dependent on microbial attributes, and soil CH 4 uptake was more directly related to edaphic properties rather than microbial attributes. Thus, different patterns of soil CO 2 , CH 4 , and N 2 O emissions and associated controls following land use change provided novel insights into predicting the effects of afforestation on climate change mitigation outcomes.