基于土壤有机碳密度变化率的畜禽粪便农田承载力估算

为完善面向土壤固碳的畜禽粪便承载力估算方法研究，以北大荒集团和新疆生产建设兵团种养业生产系统为研究对象，根据种养业生产现状与农田土壤固碳机制，以静稳态模型为基础，构建基于土壤有机碳密度变化率的畜禽粪便农田承载力模型；设定土壤有机碳密度变化率目标值，估算每hm²农田适宜施用畜禽粪便有机肥量与畜禽承载量。结果表明：1）当农田土壤有机碳密度维持当前水平，北大荒集团和新疆生产建设兵团农田可承载的畜禽养殖量以猪当量计分别为180.5~832.1和14.7~327.6头/hm²。2）考虑土壤固碳需求，两地畜禽养殖业未来发展潜力大。本研究成果可为区域种养结合与绿色低碳发展提供参考资料。

Estimation on farmland bearing capacity of animal manure based on soil organic carbon density change rate

To develop the estimation method of the bearing capacity of animal manure based on soil carbon sequestration， The agriculture and animal husbandry production system in Beidahuang Group （BG） and Xinjiang Production and Construction Corps （XPCC） were selected as the research objects. According to the current situation of the agriculture and animal husbandry industry and farmland soil carbon sequestration mechanism， the farmland bearing capacity model of animal manure based on soil organic carbon density change rate was constructed. This model was based on the steady-state method from IPCC technical guidelines. The target value of soil organic carbon density change rate was set， and manure application amount and carrying capacity could be calculated through this model. The results showed that： 1） When the farmland soil organic carbon density remained at the current level， the bearing capacity of animal manure for BG and XPCC ranged from 180.5 to 832.1 and 14.7 to 327.6 pig equivalent per hectare， respectively. 2） Considering the demand for soil carbon sequestration， the amount of animal breeding would be increased in the future. This study provided reference materials for coupling crop and livestock production， green and low-carbon development.