宁夏盐池县不同土地利用类型的生态服务价值预测

为了评估和预测不同土地利用类型的生态服务价值,以宁夏回族自治区盐池县为例,对6类土地利用类型(耕地、林地、草地、盐碱地、荒漠和其他地)和其生态服务价值的变化情况进行了研究.结果表明,1999-2004年草地和耕地转出量最大,总体以耕地转化为草地的面积多；2004-2010年,耕地和草地转出量最大,草地和耕地互相转换的现象还存在,并且小部分草地存在沙化现象.2004年的总生态服务价值最大,整体呈先增后减的趋势.1级类型服务项中调节服务和支持服务的比例较高,年际间变化不明显.2级类型服务以土壤保持、生物多样性保持和气候调节3项为主.总体上,各年间的林地和草地的贡献率最大.

Prediction of Ecological Service Values Under Different Land Use Types in Yanchi County,Ningxia Hui Autonomous Region

In order to predict and evaluate the ecological service values under different land use types in Yanchi County,Ningxia Hui Autonomous Region,a research on the changes of land uses and ecological service values was conducted for six types of land uses(farmland,forestland,grassland,saline land,desert and other lands).Results showed that from 1999to 2004,the amount of transferred grassland and farmland was greater than other land uses,with farmland being mainly transferred to grassland.From 2004to 2010,the transferred farmland and grassland were still more than other land uses,and the conversion between grassland and farmland still occurred in this period,with a small portion of grassland being turned into desert.In these years,the total ecological service value of 2004was the highest and the overall trend first increased and then decreased.In the first class service,the values for regulating services and support services were greater than others,but the annual changes were insignificant.Soil conservation,biodiversity conservation and climate regulation dominated in the second class service.Generally,the contribution from forestland and grassland was the largest in these years.