Microtopographic differences in CO2 emissions under long-term straw return: The role of microbial resources limitation - Mengmeng Zou; Wantai Yu; Qiang Ma; Yu Ning; Siyu An; Shuo Wang; Zhuqing Xia; Xinhui Zhang; Yun Gao; Mulisa Faji Dida; Shuailin Li (CATENA, 2026)