摘要
为探明色季拉山迎风坡土壤物理性质垂直地带性空间差异,对色季拉山不同海拔土壤物理性质进行分析,以期更为精确地了解该区域的水土流失潜在发生危险性。结果表明:1)土壤容重总均值、总孔隙度、毛管孔隙度和非毛管孔隙度变化范围分别为0.68~1.02 g·cm-3、60.86%~68.52%、51.26%~59.45%和9.07%~11.19%。饱和含水率和毛管含水率具有相同的变化规律,二者从大到小均依次为3800、4400、4600、4200、3600、3400、4000 m,田间持水率随海拔变化大致呈M型变化趋势;2)在相同的海拔高度,容重随土层增加而增大,总孔隙度、毛管孔隙度和持水性则相反,非毛管孔隙度随土层并未表现出规律;3)容重与总孔隙度、饱和含水率、毛管含水率以及土壤渗透率呈极显著负相关(P<0.01)。色季拉山迎风坡土壤物理性质在不同海拔和不同土层均存在空间异质性,且表层土壤(0~10 cm)各物理指标基本优于深层土壤(>10~30 cm)。植被覆盖度和人为干扰强度是导致空间异质性的主要原因。
In order to find out the vertical zonal spatial variations of soil physical properties on the windward slope in Sygera Mountain,the soil physical properties of Sygera Mountain at different altitude gradients were analyzed,so that we could more accurately understand the potential dangers of soil erosion in the region.The results showed that,1)The soil bulk density,total porosity,capillary porosity and non-capillary porosity ranged from 0.68-1.02 g·cm-3,60.86%-68.52%,51.26%-59.45%and 9.07%-11.19%.The saturated water content and capillary water content followed a similar trend,from large to small,the order was 3800,4400,4600,4200,3600,3400,4000 m.Field capacity plotted against altitude revealed an M-shaped trend;2)At the same altitude,soil bulk density increased with the increase in soil layer,the total porosity,capillary porosity and water holding capacity were opposite,and the non-capillary porosity was not significantly related to the soil layer;3)Soil bulk density was significantly negatively correlated with total porosity,saturated water content,capillary water contentand,soil permeability(P<0.01),the soil physical properties at different elevations and soil layers had a spatial heterogeneity,and that of surface soil(0-10 cm)were better than the deeper soil layers(>10-30 cm).Vegetation coverage and human disturbance intensity were important reasons underlying the spatial heterogeneity.
作者
姚甜甜
张鹏
万丹
喻武
张博
梁博
YAO Tiantian;ZHANG Peng;WAN Dan;YU Wu;ZHANG Bo;LIANG Bo(College of Resources and Environment/Research Center for Alpine and Soil Conservation,Tibet Agriculture and Animal Husbandry College,Linzhi,Tibet 860000)
出处
《北方园艺》
CAS
北大核心
2019年第24期94-102,共9页
Northern Horticulture
基金
国家自然科学基金资助项目(41661061)
西藏农牧学院-中国农业大学联合基金资助项目(2017-NY-04)
关键词
色季拉山
迎风坡
土壤物理性质
垂直地带性
Sygera Mountain
windward slope
soil physical properties
vertical zonation
