CHEN Fang,GAO Baolin,LI Jie,et al.Status Analysis and Evaluation of Cultivability for Sloping Farmland in Hubei Province[J].Research of Soil and Water Conservation,2023,30(01):418-422,429.[doi:10.13869/j.cnki.rswc.2023.01.034]
湖北省坡耕地现状分析及宜耕性评价
- Title:
- Status Analysis and Evaluation of Cultivability for Sloping Farmland in Hubei Province
- 文章编号:
- 1005-3409(2023)01-0418-05
- 分类号:
- F323.21
- 文献标志码:
- A
- 摘要:
- 坡耕地是耕地资源的重要组成部分,也是土壤侵蚀的策源地和水土保持的重点区域。为探究湖北省坡耕地资源现状及其宜耕性,利用GIS技术,构建了湖北省坡耕地的坡度、土壤侵蚀、土壤剖面构型和理化特性等数据库,筛选耕地坡度、土层厚度、土壤质地、土壤pH值和土壤侵蚀程度5个代表性指标,采用“限制因子法”对湖北省全域坡耕地进行了宜耕性评价。结果表明:湖北省坡耕地总面积为9 438.64 km2,占总耕地面积的18.87%,不宜耕坡耕地总面积为2 178.36 km2,占现有坡耕地面积的23.08%; 砾石含量和坡度过高是造成坡耕地不宜耕的主要因素,其中砾石含量>15%的坡耕地总面积为1 205.72 km2,坡度≥25°的坡耕地总面积为1 097.32 km2; 其次不宜耕主导因素是土壤过酸,pH值≤4.5造成坡耕地不宜耕的面积为669.60 km2,土壤侵蚀严重(极强烈以上侵蚀强度)和土层浅薄(土层厚度<30 cm)造成的不宜耕坡耕地面积分别为336.48 km2和67.55 km2。研究对因地制宜制定坡耕地水土流失防治策略以及指导坡耕地土地利用结构调整可提供科学依据和决策支撑。
- Abstract:
- Sloping farmland is an important part of farmland resources, as well as a source of soil erosion and a key area for soil and water conservation. In order to explore the current status of sloping farmland resources and their suitability for cultivation in Hubei Province, GIS technology was applied to build a database of sloping farmland in Hubei Province,which included land slope, soil erosion, soil profile configuration and its physiochemical characteristics. Land slope, soil thickness, soil texture, soil pH and soil erosion intensity degree were selected as key representative indicators. The suitability of slope farmland in Hubei Province was evaluated by ‘limiting factor method'. The results show that the total area of slope farmland in Hubei Province was 9 438.64 km2, accounting for 18.87% of the total farmland area; the total area of non-cultivable slope farmland in Hubei Province was 2 178.36 km2, accounting for 23.08% of the existing slope farmland area; the high gravel content and slope were the main factors that made the slope farmland unfit for cultivation, and the total area of slope farmland with gravel content>15% was 1 205.72 km2, the total area of sloping farmland with a slope≥25° was 1 097.32 km2; secondly, the dominant factor that was not suitable for cultivation was that the soil is too acidic, and the area of slope farmland that was not suitable for cultivation is 669.60 km2 due to the pH value≤4.5; the areas of slope farmland unsuitable for cultivation caused by serious soil erosion(extremely strong erosion gradation or more severe)and shallow soil layer(soil layer thickness < 30 cm)were 336.48 km2 and 67.55 km2, respectively. This study can provide scientific basis and decision support for formulating soil erosion control strategies for slope farmland according to local conditions and guiding the adjustment of land use structure of slope farmland.
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备注/Memo
收稿日期:2021-08-13 修回日期:2021-09-11
资助项目:湖北省水利厅资助项目“湖北省陡垦坡耕地划分调查”(CSCZXWS2020092)
第一作者:陈芳(1986—),女,湖北武汉人,工程师,博士研究生,研究方向为土壤侵蚀与水土保持研究。E-mail:moecf@qq.com