中国生态农业学报（中英文）2026，Vol.34Issue(3)：500-509,10.DOI:10.12357/cjea.20250251
玉米‖大豆间作对红壤有机碳固存的影响及其施磷响应
Effects of maize-soybean intercropping on organic carbon sequestration in red soil and its response to phosphorus application
摘要
Abstract
To explore the effect of intercropping on organic carbon sequestration in red soil and its response to phosphorus applica-tion,this study was based on a 7-year continuous field experiment in a typical low-phosphorus red soil area of Yunnan,China.Four phosphorus fertilizer gradients-0(P0),60(P60),90(P90),and 120(P120)kg(P2O5)·hm-2 were established.The study systematic-ally analyzed the changes in soil organic carbon stock,soil organic carbon fractions,carbon sequestration amount,carbon sequestra-tion rate,soil carbon pool activity index(AI),and carbon pool management index(CPMI),as well as their responses to different phosphorus fertilization levels,under two planting patterns:maize monocropping and maize-soybean intercropping.The results showed that planting pattern and phosphorus application had a significant synergistic promotion effect on the organic carbon sequest-ration in red soil.Under different phosphorus application gradients,maize-soybean intercropping significantly improved the organic carbon sequestration capacity of red soil.Compared with monocropping,the intercropping increased the SOCs by 21.3％,31.8％,30.1％,and 31.1％,and the soil carbon sequestration amount by 42.6％,49.3％,42.8％,and 46.1％under P0,P60,P90,and P120,re-spectively.The highest increases in both indices were observed under P60.Under different phosphorus application gradients,maize-soybean intercropping significantly improved the activity and stability of the red soil carbon pool.Compared with monocropping,in-tercropping increased the red soil carbon pool AI by 9.0％,36.1％,20.3％,and 14.2％;and the CPMI by 25.7％,86.0％,54.5％,and 39.7％under P0,P60,P90,and P120,respectively.The highest increases in both indexes were observed under P60.Under different phosphorus application gradients,maize-soybean intercropping significantly increased maize yields.Compared with monocropping,the intercropping increased the maize yield by 38.6％,46.1％,24.2％,and 6.5％under P0,P60,P90,and P120,respectively.Regard-less of the monocropping or intercropping pattern,rational phosphorus application significantly improved organic carbon sequestra-tion in red soil,with the highest effect observed under P90.The promoting effect of intercropping on red soil carbon sequestration was the highest under P60.In summary,maize-soybean intercropping on low-phosphorus red soil offers significant advantages in pro-moting soil carbon sequestration and increasing maize yields.The intercropping advantage is optimal at a phosphorus application rate of 60-90 kg(P2O5)·hm-2.This system is one of the optimized planting modes for increasing maize yields and promoting green,low-carbon development in the red soil region of Southwest China.关键词
玉米‖大豆间作/低磷红壤/土壤有机碳固存/碳库活度指数/碳库管理指数Key words
maize-soybean intercropping/low phosphorus red soil/soil organic carbon sequestration/carbon pool activity index/car-bon pool management index分类
农业科技引用本文复制引用
唐仁杰,李碧云,赵体磊,玉温,郑毅,汤利..玉米‖大豆间作对红壤有机碳固存的影响及其施磷响应[J].中国生态农业学报（中英文）,2026,34(3):500-509,10.基金项目
国家重点研发计划(2022YFD1901503)和国家自然科学基金(32260805)资助 This study was supported by the National Key Research and Development Program of China(2022YFD1901503),and the National Natural Science Foundation of China(32260805). （2022YFD1901503）
