Acknowledgements
This work was supported by the National Natural Science Foundation of
China (31770529 and 31988102), the Science and Technology Research
Program of Chongqing Municipal Education Commission (KJZD-K202001203,
KJZD-K202003501) and the Chongqing Science and Technology Commission
(cstc2020jcyj-msxmX0095, WEPKL2018ZD-05). We thank Dr. Weixin Cheng (UC
Santa Cruz) for suggesting the paired old-field and bare-fallow soils
and Dr. Xiuwei Zhang (Taizhou University) for providing the
bare-fallow+incubation soils used in this study. We thank Xi Chen,
Shuang Zhou, and Zhuolin Yu for laboratory assistance. We also thank Dr.
Bing Yang of Chengdu Institute of Biology, Chinese Academy of Sciences
for his help in statistical analysis.