砒砂岩覆土区典型小流域土壤可蚀性K值空间变异特征OA北大核心CSTPCD
Spatial Variability of Soil Erodibility Factor K of the Typical Small Watershed in the Soil Covered Area of Pisha Sandstone Region
[目的]研究砒砂岩覆土区典型小流域土壤可蚀性的空间变异特征,为砒砂岩覆土区土壤侵蚀机理深入探究和土壤侵蚀有效防治提供科学依据.[方法]以内蒙古准格尔旗砒砂岩覆土区二老虎沟小流域为研究对象,采集0-10 cm和10-20 cm 土层共144份土壤样品,基于EPIC模型估算土壤可蚀性K值,并利用GIS和地统计学方法分析土壤可蚀性K值空间变异特征.[结果](1)二老虎沟小流域土壤砂粒、粉粒、黏粒和有机碳均呈中等变异程度,除黏粒和有机碳为中等空间自相关性外,其他土壤属性均呈弱空间自相关性.(2)小流域土壤可蚀性K值介于0.018 7～0.047 6 t·hm2·h/(hm 2·MJ·mm),0-10 cm 和 10-20 cm 土层 K 值变异系数分别为 15.5％和 20.3％,属中等变异强度;0-10 cm 土层K值主要受随机性因素影响,呈弱空间自相关性,而10-20 cm 土层受随机性因素和结构性因素共同影响,为中等空间自相关性.(3)3种克里格插值方法结果表明:小流域土壤可蚀性K值空间变异受海拔和坡度影响明显,其总体分布趋势为西部和东南部较高、中部及偏东部较低;普通克里格插值方法较适宜应用于砒砂岩覆土区小流域,其估算结果可较好地显示土壤可蚀性的整体和局部两方面的空间变异特征.(4)在垂直空间变异上,0-10 cm和10-20 cm 土层土壤可蚀性K值总体分布规律相似,但10-20 cm 土层土壤可蚀性K值较0-10 cm 土层空间变异更为明显.[结论]海拔和坡度对砒砂岩覆土区典型小流域土壤可蚀性K值空间变异影响明显,未来应优先对坡面和坡顶区域进行土壤侵蚀防治.
[Objective]The spatial variability of soil erodibility of the typical small watershed in the soil covered area of Pisha sandstone region were explored,and to provide scientific basis for further exploring the mechanism of soil erosion and effectively preventing soil erosion in the soil covered area of Pisha sandstone region.[Methods]Erlaohugou small watershed in the soil covered area of Pisha sandstone region was taking as the study area.144 soil soil samples from 0-10 cm and 10-20 cm soil layers were collected.The EPIC model was used to calculate the soil erodibility K value,and the methods of GIS and geostatistics was used to analyze the spatial variability of soil erodibility K value.[Results](1)The variation coefficients of sand,silt,clay and soil organic carbon were moderate variability in small watershed.Except for the clay and soil organic carbon possessed by moderate spatial correlation,other soil properties had weak spatial correlation.(2)The range of soil erodibility K value was 0.018 7～0.047 6 t·hm2·h/(hm2·MJ·mm),and the variation coefficients of K value in 0-10 cm and 10-20 cm soil layers were 15.5％and 20.3％,respectively,which belonged to moderate variability.The K value in 0-10 cm soil layer affected by random factor was weak spatial correlation,yet the K value in 10-20 cm soil layer was moderate spatial correlation and influenced by random and structural factors.(3)The result of three Kriging methods showed the spatial variability of soil erodibility K value was significantly affected by elevation and slope,and spatial distribution exhibited a trend that the high K value was located in the west and southeast,and the low stand in central and east-central area.Compared with other Kriging methods,the Ordinary Kriging was more suitable for the Pisha sandstone region as a result of the better reflection of spatial variability from whole and partial.(4)In vertical spatial distribution,the soil erodibility K value belonging to different soil layers had similar distribution trend,but the spatial variability of K value in 10-20 cm soil layer was more obvious than that in 0-10 cm soil layer.[Conclusion]The elevation and slope affect the spatial variability of soil erodibility K value significantly,and the priority area for prevention and control is slope surface and top of slope in the future.
蒙雯洋;饶良懿
北京林业大学水土保持学院,北京 100083||水土保持国家林业和草原局重点实验室,北京 100083
农业科学
土壤可蚀性K值EPIC模型空间变异特征砒砂岩覆土区小流域
K value of soil erodibilityEPIC modelspatial variabilitysoil cover area of Pisha sandstone regionsmall watershed
《水土保持研究》 2024 (003)
10-19 / 10
北京市科技新星计划(2006A22);国家重点研发计划"砒砂岩区复合土壤侵蚀综合治理技术"(2017YFC0504503)
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