RISK ANALYSIS OF WIND EROSION AND DESERTIFICATION IN BLACK LAND BASED ON ANALYTIC HIERARCHY PROCESS: A Case Study of Fuyu County, Heilongjiang Province
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摘要:
黑土地风蚀沙化危险性分析对黑土地沙化趋势具有一定预测意义, 可以服务下一步沙化灾害预防工作. 通过结合前人所作的风蚀危险性评价和土地沙化敏感性评价因子, 结合富裕县实际, 选出适合其风蚀沙化危险性评价的因子, 采用层次分析法计算各因子所占权重, 依托地表基质调查项目所得调查点位实验数据, 利用GIS平台计算功能, 得出富裕县风蚀沙化危险性的空间分布规律. 评价结果表明, 富裕县以危险型区和轻险型区为主, 总计占比达82.99%, 强险型区占比不到0.1%, 说明区内存在不同程度的风蚀沙化情况, 危险级别从东北向西南上升, 其治理紧迫性和难易程度从东北向西南升高. 本研究界定了风蚀沙化危险级别的界限, 可为土地沙化防治提供借鉴.
Abstract:The risk analysis of wind erosion and desertification in black land is significant for the prediction of desertification trend of black land and prevention of desertification disaster. Based on the previous wind erosion risk assessment and land desertification sensitivity assessment factors as well as the practice in Fuyu County, the study selects the factors suitable for the risk assessment and calculate the weights of each factor with analytic hierarchy process(AHP) method. Adopting the experimental data from the ground substrate survey project, the spatial distribution regularity of wind erosion and desertification risk in Fuyu County is obtained through the calculation function of GIS. The assessment results show that Fuyu County is dominated by risk area and light risk area, accounting for 82.99% of the total, and the high risk area less than 0.1%, indicating that there are varying degrees of wind erosion and desertification in the area, with the risk level rising from northeast to southwest, and the governance urgency and difficulty increasing from northeast to southwest. The study defines the risk level limits of wind erosion and desertification, which can provide references for desertification control and prevention.
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Key words:
- black land /
- wind erosion /
- desertification /
- risk assessment /
- analytic hierarchy process(AHP) /
- Heilongjiang Province
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表 1 风蚀沙化危险性影响因子权重判断矩阵
Table 1. Judgment matrix of impact factor weight for wind erosion and desertification risk
权重因子 黏粒含量 黑土层厚度 含水率 有机碳含量 NDVI 权重值 黏粒含量 1 1.5 2 3.56 2 0.3371 黑土层厚度 0.67 1 1.5 2.5 1.5 0.2382 含水率 0.5 0.67 1 1.75 1 0.1641 有机碳含量 0.28 0.4 0.57 1 0.5 0.092 NDVI 0.5 0.67 1 2 1 0.1687 
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表 2 富裕县风蚀沙化危险等级划分
Table 2. Degrees of wind erosion and desertification risk in Fuyu County
危险型 无险型 轻险型 危险型 强险型 危险性指数 R＜0.5 0.5≤R＜0.7 0.7≤R＜0.9 R≥0.9
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