摘要
基于2000—2017年北三河流域的气象和遥感资料,采用InVEST模型定量分析了流域内生态系统的土壤侵蚀和保持状况,同时对不同土地利用类型的土壤保持功能进行了动态评估。结果表明:2000—2017年研究区土壤保持量整体上呈微弱减少的趋势,减少率为0.03×10^(8) t·a^(-1)。多年平均土壤保持量为5.90×10^(8) t,而实际土壤侵蚀量与潜在土壤侵蚀量的平均值分别为0.07×10^(8) t和5.04×10^(8) t,实际土壤侵蚀以微度和轻度侵蚀为主。流域土壤保持强度大致呈现北高南低的分布格局,北部植被覆盖度高的山区平均土壤保持量高达493.30 t·hm^(-2)·a^(-1),且土壤保持量变化较大,减少量普遍超过30 t·hm^(-2)·a^(-1),而南部耕地及居民区平均土壤保持量仅为1.87 t·hm^(-2)·a^(-1),土壤保持量变化较小(±10 t·hm^(-2)·a^(-1))。不同土地利用类型的土壤保持能力依次为林地>草地>耕地>水域>未利用地>建设用地,各土地利用类型的土壤保持量均呈减少趋势。
Based on the meteorological and remote sensing data of Beisan River Basin from 2000 to 2017,using the InVEST model to quantitatively analyze the soil erosion and conservation of ecosystem in the watershed,and dynamically evaluate the soil conservation function of different land use types.The results showed that,the soil conservation showed a weak decreasing trend during 2000—2017,and the reduction rate was 0.03×10^(8) t·a^(-1).The annual average soil conservation was 5.90×10^(8) t,while the average values of actual and potential soil erosion were 0.07×10^(8) t and 5.04×10^(8) t,respectively,and the actual soil erosion is mainly micro-erosion and mild erosion.The soil conservation capacity was high in the north and low in the south,the average soil conservation of mountainous areas with high vegetation coverage in the north was 493.30 t·hm^(-2)·a^(-1).The amount of soil conservation changed greatly,and the reduction rate was generally more than 30 t·hm^(-2)·a^(-1).The average soil conservation of cultivated land and residential areas in the south was only 1.87 t·hm^(-2)·a^(-1),and the amount of soil conservation changed slightly(±10 t·hm^(-2)·a^(-1)).The soil conservation capacity of different land use types was:forestland>cultivated land>waterbody>unused land>construction land,and the total amount of soil conservation of each land use type showed decreasing trend.
作者
赵欣悦
王金凤
李庆
李文静
ZHAO Xinyue;WANG Jinfeng;LI Qing;LI Wenjing(Geography Science Institute,Shanxi Normal University,Linfen,Shanxi 041000,China;Institute of Geographical Sciences,Hebei Academy of Sciences/Hebei Engineering Research Center for Geographic Information Application,Shijiazhuang,Hebei 050011,China)
出处
《石河子大学学报（自然科学版）》
CAS
北大核心
2022年第4期487-496,共10页
Journal of Shihezi University(Natural Science)
基金
国家自然科学基金项目(41801034,41807518)
河北省科学院院管项目(20103)。
