宁德市生态系统土壤保持功能评价研究

A Study on Evaluation of Soil Conservation Service in the Ecosystems of Ningde City

基于INVEST模型，对宁德地区生态系统土壤保持功能进行评价，并探讨了其空间分布特征。结果表明：宁德地区土壤保持总量为9．35X10^8t／a，单位面积土壤保持量为695，3t／（hm2oa），空间上呈现中部高，东北部次之，西南部低的分布格局，各县市差异显著；各生态系统土壤保持能力从大到小依次为：灌丛〉林地〉草地〉早地〉园地〉水田〉红树林〉草本湿地〉城镇，自然生态系统优于人工生态系统。

Based on an integrated valuation of ecosystem services and tradeoffs （INVEST） model, spatial characteristics of soil conservation service in the ecosystems and its impact factors in Ningde region were analysed. The results showed that the total of soil conserved there was approximately 9.35 x 10^8 t/yr whilst the average capacity per unit area was 695.3 t/ha/yr for the entire region. With regard to the spatial pattern, it displayed the highest capacity in the central part, the next in the northeast, and the lowest in the southwest. There were significant differences from area to areas. The soil conservation capacities differed widely across various ecosystems with a descending order from shrubs to forests, grasslands, dry lands, plantation, paddy lands, mangroves, swamp and towns. Natural ecosystems were generally found to perform better than artificial ones in terms of conserving soil resources.