河南省典型区域畜禽粪污土地承载力及其影响因素研究
Study on Land Carrying Capacity of Livestock and Poultry Manure in Typical Areas of Henan Province and the Influencing Factors
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摘要: 为精准评估河南省典型区域畜禽粪污土地承载力现状及不同因素的影响程度, 本文基于养分平衡理论, 以县域为单元测算河南省典型区域畜禽粪污养分资源供需关系、畜禽适度养殖规模及剩余养殖量, 并运用灰色关联分析法对土地承载力影响因素进行定量分析。结果表明, 河南省整体上作物畜禽粪污养分需求量大于供给量, 部分县域存在氮磷污染风险, 畜禽适度养殖规模总量为8 871.5万头, 剩余养殖量为3 389.9万头, 各县域畜禽适度养殖规模差异显著。各影响因素对区域畜禽粪污土地承载力的影响由大到小为耕地面积>谷物种植面积占比>单位面积化肥施用量>农用机械总动力。研究结果可为调整区域养殖业布局及探索畜禽粪污土地承载力提升途径提供科学依据。Abstract: In order to accurately evaluate the land carrying capacity of livestock and poultry manure in typical areas of Henan Province and its influence factors, on the basis of nutrient balance theory, we describe the supply and demand of livestock and poultry manure, and the scale of breeding and quantity of livestock and poultry in this province. Grey correlation analysis is used to evaluate factors that affecting land carrying capacity. In general, demand for nutrients from manure exceeds supply; risks of nitrogen and phosphorus pollution exist in some counties; the total moderate breeding scale of livestock and poultry is 88.715 million head, with a remaining breeding capacity of 33.899 million head; and this moderate breeding scale differs significantly among counties. Factors that affecting land carrying capacity, ranked from highest to lowest, are: cultivated land area > proportion of cereal planting area > amount of chemical fertilizer applied per unit land area > total power of agricultural machinery. These results provide a scientific basis on which the layout of regional agriculture industry can be adjusted, and new ways to improve the land carrying capacity of livestock and poultry manure can be explored.