宁夏盐池县生态退耕前后农资投入时空变化分析

发布时间：2018-05-01 11:17

本文选题：生态退耕 + 农资投入　；参考：《中国农学通报》2011年32期

【摘要】：为了深入探讨生态退耕前后宁夏盐池县的生态与环境状况,定量分析其农资投入的时空变化特点是现阶段的必要手段,主要利用GIS软件,计算研究区退耕前后的2000—2008年耕地面积和农资投入量的分布重心及其变化。结果表明:随着耕地数量的波动下降,化肥和农膜投入的总量呈波动上升趋势,而农药投入呈波动下降趋势,但耕地面积与农资投入量波动的方向相反;耕地分布重心的偏移方向大致与农资投入量分布重心的移动方向相反。生态退耕幅度最大的2003年,劣质耕地被大量退耕,但优质耕地面临农资投入增高所带来的面源污染问题。2003年后,西北—东南过渡区不仅耕地面积增加,且单位面积农资投入量维持较高。可见,现阶段研究区仍然面临耕地增加所带来的生态退化问题和农资投入较高所潜伏的面源污染问题。
[Abstract]:In order to probe into the ecological and environmental conditions of Yanchi county before and after ecological conversion, it is necessary to quantitatively analyze the spatio-temporal variation of agricultural inputs in Yanchi County, Ningxia. It is necessary to make use of GIS software. The distribution center and change of cultivated land area and input amount of agricultural materials before and after returning farmland in the study area were calculated. The results showed that with the decrease of the amount of cultivated land, the total input of fertilizer and film increased, while the input of pesticide decreased, but the area of cultivated land fluctuated in the opposite direction with the input of agricultural material. The migration direction of the center of gravity of cultivated land distribution is approximately opposite to that of the center of gravity of the distribution of agricultural inputs. In 2003, when ecological conversion was the largest, the low-quality cultivated land was returned to farmland in large quantities, but the high-quality cultivated land faced the problem of non-point source pollution caused by the increase of agricultural resources input. After 2003, not only the cultivated land area increased, but also the area of cultivated land increased in the transitional region of Northwest China and Southeast China. And the input amount of agricultural material per unit area was higher. Therefore, at present, the research area still faces the problem of ecological degradation caused by the increase of cultivated land and the latent problem of non-point source pollution caused by the higher input of agricultural materials.
【作者单位】：中国科学院地理科学与资源研究所;宁夏盐池县环境保护和林业局;
【基金】：国家自然科学基金项目“生态退耕对土地类型结构的影响及环境效应研究”[40971282(2010-2012)]
【分类号】：F326.6;X196

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