高级检索+

粪肥就近还田视角的武功县种养业空间分布平衡性评价

Evaluating the spatial distribution balance of planting and animal breeding industry in Wugong county from the perspective of manure returning to nearby farmlands

  • 摘要: 构建种养循环是一项区域性的系统工程,近地布局养殖场有利于提高农民以有机粪肥替代化肥的积极性,进而缓解农业污染。以陕西省咸阳市武功县为例,结合经解译多尺度遥感影像得到的农田耕地信息和经普查得到的畜禽养殖场信息,对武功县畜禽粪肥供给和作物粪肥需求的空间关系开展多维度的测算与评价。结果表明:武功县养殖场粪肥供给总体不足,仅能供给全区耕地氮养分需求的20.95%;411家养殖场中有49个畜禽养殖场存在明显的空间集聚现象,养殖场粪肥供给与农田粪肥需求存在明显的空间错位(占总消纳面积的11.94%);通过配套粪便消纳耕地促进种养循环模式构建让武功县16.01%的配备地处于养分过剩的风险,83.99%的配备地处于低效使用的状态;因养殖场可供肥区重叠挤压引起的运粪距离比非挤压状态的平均运粪距离增加了2倍(856.76 m)。突破单个主体的种养结合模式,在区域层面上助力种养业间的空间用肥协调应成为监管的方向,一方面要强化制度设计,提升武功县养殖业生产水平,另一方面要强化监管,将粪肥消纳最远半径(小于2.4 km)和消纳区重叠预警纳入监管依据。该研究可为类似的县域种养业空间布局提供有价值的监管理论参考。

     

    Abstract: Planting and breeding can be separated to improve the level of the planting and breeding cycle in agricultural production. The layout of the breeding farms near the planting farms can be expected to replace chemical fertilizer with organic fertilizer (manure). Agricultural pollution can also be alleviated, such as the excessive application of chemical fertilizers and local accumulation of manure. This study aims to evaluate the spatial relationship between breeding manure supply and planting manure demand from multiple dimensions. An example area was also taken as the Wugong county in Xianyang City, Shaanxi province, China. The farmland information was combined to be obtained from multi-scale remote sensing images. A comparison was then made from experience information on the breeding farms from the census. The results reveal that there was an insufficient supply of the nitrogen nutrient from manure. Among them, there was only 20.95% of the nitrogen nutrient demand of planting farms in the whole region, even far below the recommended value of the organic nutrients for the crops; Furthermore, there was the outstanding spatial agglomeration in 49 livestock and poultry farms among the 411 breeding ones. There was also the outstanding spatial mismatch between the supply of manure from the livestock-poultry and the demand for manure from planting farmlands (accounting for 11.94% of the total farmland areas); A breeding and planting cycle model was constructed to promote the manure absorption in farmlands. Among them, 16.01% of the farmlands were at risk of the nutrient surplus, while 83. 99% were in an inefficient use; Some livestock and poultry farms were so close to each other in the areas of farmland that were covered by the manure from the different overlapping areas. The average transport distance then increased for the manure transportation between breeding farms and their nearby farmlands. The reason was that the fertilization was repeated on its own land; Excess manure was transported into the more distant farmlands. Each plot of 1330.12m increased the average distance of the manure transport by two times, 856.76 m, compared with the non-overlapping squeeze state. There was coordinated application of organic manure between the planting and breeding industries at the regional level. A circular mode of planting and breeding was then replaced with a single breeding farm. It was necessary to improve the scale of livestock production during institutional design. Some supervision can be strengthened, including the overlapping warning of the farthest radius (less than 2.4km) and the absorption area into the regulatory area. There was an optimal maximum transport distance of manure from the breeding farms to the planting. Then the scale and spatial location of the breeding farms were determined for all manure from breeding farms returning to the fields; If there is an overlap area between the manure coverage farmlands, it is required to adjust the spatial relationship between the two breeding farms until the overlap area disappears. The finding can provide a valuable theoretical reference for the planting and breeding spatial layout at the county level.

     

/

返回文章
返回