郑州市农用地畜禽粪便氮负荷估算及利用途径探讨

从资源利用的角度,以土壤植物营养学原理为指导,结合前人的研究成果,估算了郑州市土壤最大氮承载量和2009年畜禽粪便氮负荷量,同时对其环境风险进行分析评价,最终提出了畜禽粪便的利用途径。结果表明:郑州市单位面积土壤最大氮承载量为144.9kg/hm2,2009年郑州市畜禽粪便氮负荷量为88.0kg/hm2。在农作物秸秆还田的基础上,对畜禽粪便进行发酵、堆肥等无害化处理之后,将其全部施入郑州市农田不会造成环境污染。从局部来看,郑州市不同区域土地对畜禽粪便的消化能力不同,其中消纳畜禽粪便能力最强的是中牟县,单位面积土壤最大承载量高达200.4kg/hm2。

Estimation of Livestock Manure Nitrogen Load and Research on the Utilization Patterns of Farmland in Zhengzhou City

Based on the principles of soil-plant nutrition,the maximum carrying capacity of soil nitrogen and the nitrogen load amount of livestock manure were estimated in Zhengzhou city from the resource utilization angle.Besides,the environmental risk was analyzed and evaluated,and the path to utilize the livestock manure was presented.The results indicated that the maximum carrying capacity of soil nitrogen per unit area was 144.9 kg/ha,and the nitrogen load amount of livestock manure was 88.0 kg/ha.Thus,there would be no pollution on the basis of crop straw returning to put all the livestock manure into the soil after innocent treatment,which was considered a promising and effective path to utilize livestock manure in the future.