State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Oct;28(37):51356-51368. doi: 10.1007/s11356-021-14310-w. Epub 2021 May 12.
At present, the contradiction between survival and ecology necessitates the integration of crop planting, chemical fertilizer application, and livestock and poultry breeding. Reasonably integrated crop-livestock systems (ICLSs) have become an important part of regional ecological and agricultural development. In this study, the relationship between manure nutrient demands for crops and manure nutrient supply from livestock is considered based on the balance of ICLSs in Jiangxi Province, China. The land carrying capacity index and potential of livestock breeding under uncoordinated systems are further discussed. The study also addresses water environmental risk due to surplus nutrients by integrating a traditional land carrying capacity framework and hydrological model. The results show that phosphorus absorption in land areas is the main limiting factor for the development of the livestock and poultry industries. In addition, manure nutrient demand exceeded supply in most districts, while the unbalanced regions with nutrient pollution are located in the upper and middle reaches of the Ganjiang basin. In addition, expanding the crop demand for manure or increasing the manure collection rate will help reduce environmental harm; however, attention should be paid to the risk of excessive manure returns. Additional livestock manure can be transferred to regions with developed crop planting systems. This study supports more harmonious and common ICLSs construction.
目前，生存与生态之间的矛盾要求种植业、化肥施用和畜牧业的融合。合理的种养结合系统（ICLS）已成为区域生态和农业发展的重要组成部分。本研究基于江西省种养结合系统的平衡，考虑了作物对厩肥养分需求与家畜厩肥养分供应之间的关系。进一步讨论了不协调系统下土地承载能力指数和畜牧业养殖潜力。本研究还通过整合传统的土地承载能力框架和水文模型，解决了由于养分过剩带来的水环境污染风险。结果表明，土地对磷的吸收是畜牧业发展的主要限制因素。此外，大部分地区的厩肥养分需求超过了供应，而养分污染不平衡的地区位于赣江流域的上游和中游。此外，扩大作物对厩肥的需求或提高厩肥收集率有助于减少环境危害；然而，应注意过度厩肥还田的风险。多余的牲畜粪便可以转移到作物种植系统发达的地区。本研究支持更和谐、共同的 ICLS 建设。
