标题: Impact of cropland use transformation on ecosystem carbon sinks in a typical agroforestry mixed region: An analysis from explicit and implicit perspectives

作者: Zhou, YJ (Zhou, Yajuan); He, LJ (He, Lijie); Zhang, ES (Zhang, Ershen); Lu, D (Lu, Dan); Lin, AW (Lin, Aiwen)

来源出版物: ENVIRONMENTAL IMPACT ASSESSMENT REVIEW 卷: 115 文献号: 107979 DOI: 10.1016/j.eiar.2025.107979 Published Date: 2025 AUG

摘要: Cropland use transformation (CUT) not only increases grain production but also considerably impacts regional ecosystem carbon sinks. However, comprehensive studies exploring connections between CUT and ecosystem carbon sinks are limited. We constructed an indicator system and transformation framework for CUT by considering explicit and implicit dimensions. Moreover, we analyzed changes in the CUT in the middle and lower reaches of the Yangtze River Basin (MLYB), as well as the trends in net ecosystem productivity (NEP). Structural equation modeling was used to explore the direct and indirect impacts of CUT on NEP. The MLYB lost approximately 0.82-0.86 x 103 km2 of cropland annually, with the cropland being primarily transformed into construction and forest land. The proportion of the three major grain crops showed fluctuating increases. The average NEP in the MLYB from 1999 to 2019 was 549.36 gC/m2/yr, while the capacity of ecosystem carbon sinks gradually weakened, with approximately 29.96 % of the area showing a highly significant degradation trend, and 19.42 % showing a significant degradation trend. In terms of explicit CUT indicators, the total effect of the cropland area on NEP was negative, with a direct effect of-0.21, an indirect effect of 0.10, and a total effect of-0.11. The overall effect of the cropping structure on NEP was positive, with a direct effect of 0.21, an indirect effect of 0.02, and a total effect of 0.23. Regarding implicit CUT indicators, the input of agricultural production factors directly inhibited ecosystem carbon sinks, with an effect value of-0.62. Cropland output directly promoted NEP, with an effect value of 0.65. This study explains the relationship between CUT and ecosystem carbon sinks, providing a scientific basis for advancing green agriculture in China.

作者关键词: Cropland use transformation (CUT); Ecosystem carbon sink; Structural equation modeling (SEM); Impact effects; Middle and lower reaches of the Yangtze River; Basin (MLYB)

KeyWords Plus: NET PRIMARY PRODUCTIVITY; SUSTAINABLE INTENSIFICATION; LAND; EMISSIONS; DYNAMICS; FOREST; CHINA; NPP

地址: [Zhou, Yajuan; Lu, Dan; Lin, Aiwen] Wuhan Univ, Sch Resource & Environm Sci, 129 Luoyu Rd, Wuhan 430079, Peoples R China.

[He, Lijie] Huazhong Agr Univ, Coll Publ Adm, Wuhan 430070, Peoples R China.

[Zhang, Ershen] Wuhan Univ, Sch Urban Design, Wuhan 430072, Peoples R China.

通讯作者地址: Lin, AW (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 129 Luoyu Rd, Wuhan 430079, Peoples R China.

电子邮件地址: geoyjzhou@whu.edu.cn; helijie@mail.hzau.edu.cn; eszhang@whu.edu.cn; ludwhu@whu.edu.cn; aiwenLIN_geo@163.com

影响因子：11.2