生态退耕背景下甘肃省正宁县耕地保护压力分析
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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)


Cropland Protecting Pressure in Zhengning County of Gansu Province Affected by the" Grain for Green" Project
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    摘要:

    以甘肃省正宁县1995, 2000和2010年1∶10万的土地利用图和1995-2008年有关耕地利用的统计数据作为分析依据, 以ENVI, ArcGIS和SPSS软件为主要工作平台, 对案例区生态退耕前后的耕地分布格局变化及耕地保护压力进行了分析。 生态退耕实施后, 大部分坡耕地转为林地, 建设用地占用平原耕地明显。 耕地空间分布表现为由分散向集中, 由不规则向规则方向转化。 因子分析显示, 耕地保护压力主要涉及3方面因素:人们生活和生产水平主导的人文因素, 退耕补贴水平体现的政策因素以及成灾面积体现的自然因素。 为了缓解生态退耕区的耕地保护压力, 需要控制建设用地占用平原耕地,稳定生态补偿水平以避免已退耕地的复垦。 同时需注意控制农资投入水平, 防止农业面源污染加剧的风险。

    Abstract:

    Based on the land use maps in 1995, 2000 and 2010, as well as the statistical data of cropland use in Zhengning County of Gansu Province, cropland distribution change and cropland protecting pressure were studied before and after the "grain for green" project by using ENVI, ArcGIS and SPSS.After the "grain for green" project, most of low-quality slope croplands were returned to forestland, and some of high-quality plain croplands were occupied by expanding construction land.The spatial pattern of croplands changed from scattered and irregular to concentrated and regular distribution.Factors for cropland protecting pressure in Zhengning County can be divided into artificial, policy and natural factor.The artificial factor is mainly de-termined by people's living standards and crop production conditions, the policy factor is affected by restora-tion subsidy,and the natural factor is reflected by damage area of cropland.In order to relieve cropland pro-tecting pressure in the area where the "grain for green" project was implemented, more emphasis should be placed on protecting the existing plain cropland from being occupied by construction land, stabilizing a con-siderable ecological compensation level for avoiding reclamation of the returned cropland, and limiting agro-chemical inputs in order to reduce the risk of agricultural non-point source pollution?

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申建秀,王秀红,张伟.生态退耕背景下甘肃省正宁县耕地保护压力分析[J].水土保持通报,2012,(5):23-27

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  • 收稿日期:2011-10-25
  • 最后修改日期:2011-11-27
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  • 在线发布日期: 2014-11-25
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