Impacts of carbonate rock weathering on subtropical agricultural sustainability and ecosystem stability and their zonal regulation
Year: 2026
Type: article
Abstract: 中国亚热带喀斯特核心区作为全球喀斯特的关键组成，其碳酸盐岩化学风化过程的特殊性导致区域土壤形成速率低、农业压力大，深刻影响喀斯特农业可持续性与生态系统稳定性. 然而，碳酸盐岩化学风化在农业可持续性和生态稳定性中的双重效应缺乏系统量化，限制了风化对区域可持续发展的科学认知与管理应用. 本研究基于2000~2020年多源遥感与地面观测数据，通过热力学溶蚀模型、阈值分析及空间关联方法，揭示了风化速率的时空动态及其影响机制. 结果显示：研究期内区域平均风化速率以年均0.38 mm ka−1显著增长，空间呈“东南高、西北低”格局; 农业可持续性与生态系统稳定性分别存在33.1 mm ka−1和29.55 mm ka−1的关键阈值，低于阈值时风化以养分供给和生境改良为主导正效应，高于阈值则转变为土壤漏失和石漠化等驱动的负效应; 89.6%的区域呈现风化与农业可持续性正相关，70%的区域与生态稳定性呈正相关，而高风化速率区（如广西、湖南中部）形成“高风化-低可持续性”集聚. 因此，碳酸盐岩风化对喀斯特农业—生态系统的影响并非单向线性，而是通过双阈值效应实现“资源供给-环境胁迫”的动态转换，这一发现挑战了传统“风化有益或有害”的单一认知. 本研究为全球喀斯特地区应对气候变化、协调农业发展与生态保护提供了关键科学依据与分区调控方案.
Institutions: Guizhou University, Chinese Academy of Sciences, Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, University of Chinese Academy of Sciences, South China Botanical Garden, Northeast Forestry University, Beijing Forestry University, Beijing Normal University, State Key Laboratory of Earth Surface Processes and Resource Ecology, Institute of Geographic Sciences and Natural Resources Research, Northwest A&F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Guizhou Normal University, Yunnan University
Language: English
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDGs: Climate action, Life on land
Open Access status: bronze
OpenAlex ID: W7153074936
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