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The influence of forest-to-cropland conversion on temperature sensitivity of soil microbial respiration across tropical to temperate zones
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2024-01-27 , DOI: 10.1016/j.soilbio.2024.109322 Jun Pan , Yuan Liu , Nianpeng He , Chao Li , Mingxu Li , Li Xu , Osbert Jianxin Sun
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2024-01-27 , DOI: 10.1016/j.soilbio.2024.109322 Jun Pan , Yuan Liu , Nianpeng He , Chao Li , Mingxu Li , Li Xu , Osbert Jianxin Sun
As one of the most important drivers of global climate change, land use change (LUC) has markedly altered the regional and global carbon (C) cycles. However, the geographic variations and the key drivers in the effects of LUC on temperature sensitivity () of soil microbial respiration () are still not fully elucidated, hence impeding the spatially explicit predictions of soil C cycling under climate change. Here, we used a paired-plot approach with data for 19 locations distributed from the tropical to temperate zones in eastern China, and compared the temperature responses of between forest and cropland soil. Results showed that the latitudinal patterns of in forest soils were better explained by climatic variables; whereas in cropland, soil trended higher with increasing latitude, with climatic factors, pH, clay, and soil organic C (SOC) jointly modulating the spatial variations in . Overall, the values of tended to converge with latitude between forests and croplands, with change in from forest to cropland, Δ, significantly decreasing from the tropical region (9.23 ± 3.58 %) to the subtropical (0.58 ± 1.93 %) and temperate (−0.97 ± 1.11 %) regions. Moreover, the spatial variations of Δ were significantly affected by climatic factors, ΔpH, Δmicrobial biomass C (ΔMBC), and their interactions. Our findings highlight the potential impacts of LUC-related biogeographic variations in the temperature response of , and emphasize the importance of incorporating the land-use effects on the temperature sensitivity of soil microbial respiration into terrestrial C cycle models to improve predictions of carbon-climate feedbacks in the future.
更新日期：2024-01-27
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