Spatial heterogeneity of understory soil physical properties for Picea schrenkiana var. tianschanica in the Tianshan mountains | 天山云杉林下土壤物理性质空间异质性研究

chinois. 天山云杉（Picea schrenkiana var.tianschanica）是整个天山植被群落的优势树种和建群种,在新疆天山中段天山云杉分布海拔范围（1960~2700m）内,按海拔梯度每隔100m取样,研究不同海拔高度天山云杉林下土壤物理性质的变化规律。结果表明：（1）土壤容重随土层深度的增加而增加,土壤总孔隙度、毛管孔隙度、非毛管孔隙度、土壤含水量、土壤饱和持水量、毛管持水量和田间持水量随土层加深而减小;（2）0~60cm土层中,在海拨1960~2300m之间,随着高度的增加,土壤容重逐渐减小,在2300~2700m之间则相反;（3）在海拔1960~2300m范围内,土壤总孔隙度、土壤毛管孔隙度、毛管持水量、饱和持水量和田间持水量随海拨升高逐渐增大,在海拨2300m以上,随高度增加而逐渐变小;非毛管孔隙随着海拨高度的变化不大。（4）海拔2500m处的土壤自然含水量最高。[著者文摘]

anglais. Picea schrenkiana vat. tianschanica is dominant tree species and constructive species in the Tianshan mountains. In the middle of Tianshan mountains, elevation ranged from 1 960 - 2 700 m, the spatial heterogeneity of understory soil physical properties for P. schrenkiana vat. tianschanica at 100 m elevation gradient was stud- ied. The results showed that ： （ 1 ） The soil volume weight increased with the increase of soil depth, however, the total porosity, capillary porosity, noncapillary porosity, water content, saturated moisture capacity, capillary holding capacity and field capacity decreased gradually. （2）In the layer of 0 -60 cm, soil volume weight decreased with the increase of elevation from 1 960 m to 2 300 m. While increased from 2 300 m to 2 700 m. （ 3 ） In the layer of 0 - 60 em,total porosity, capillary porosity, capillary holding capacity, saturated moisture capacity and field capacity increased with the rise of elevation from 1 960 m to 2 300 m, and decreased from 2 300 m to 2 700 m. but, noncapillary porosity showed little change among all elevations. （4） In the layer of 0 ~ 60 cm, natural water content was highest in the 2 500 m elevation.