基于GIS的福建省水土保持功能重要性评价

目的] 对福建省水土保持功能重要性进行评价，为该省生态保护红线划定提供科学参考。方法] 基于GIS技术，利用降水、土壤、数字高程和植被指数等数据，采用修正通用水土流失方程（RUSLE），估算福建省土壤保持量，并对其分级。结果] 全省土壤保持总量为2.65×10⁹ t/a，平均土壤保持模数为20 789.82 t/（km²·a）。水土保持功能极其重要区、高度重要区、中等重要区、较为重要区和一般重要区面积分别为3 192.54，8 205.54，15 547.71，21 519.81，74 000.20 km²，分别占全省面积的2.61%，6.70%，12.70%，17.57%和60.42%。结论] 福建省水土保持功能极其重要区、高度重要区和中等重要区主要分布在闽西和闽中2大山带及其周边丘陵山地区。

Importance Evaluation of Soil and Water Conservation Function in Fujian Province Based on GIS

Objective] The importance of soil and water conservation was evaluated as a means to provided a scientific basis for ecological protection via red line delimitation in Fujian Province.Methods] The soil conservation modulus in Fujian Province was estimated and classified using GIS technology and the revised universal soil loss equation (RUSLE) along with data such as precipitation, soil, digital elevation, and vegetation index.Results] The total amount of soil conservation in Fujian Province was estimated to be 2.65×10⁹ t/a, and the average soil conservation modulus was 20 789.82 t/(km²·a). The soil and water conservation functional areas in Fujian Province were classified into five types: extremely important, highly important, medium importance, relatively important, and generally important. These corresponded to areas of 3 192.54, 8 205.54, 15 547.71, 21 519.81, and 74 000.20 km², respectively, which represent 2.61%, 6.70%, 12.70%, 17.57%, and 60.42% of the total area of the province, respectively.Conclusion] The extremely important areas, highly important areas, and areas of medium importance with respect to the need for soil and water conservation are mainly distributed in two mountain zones of the Western and Central Fujian Province and the surrounding hilly areas.