Relationship between Characteristics of Soil and Vertical Distribution of Vegetation on the Northern Slope of Qilian Mountains
There are desert grassland,dry shrub grassland,mountain forest grassland,subalpine shrub meadow,alpine cold desert meadow on vertical vegetation belt along northern slope of Qilian Mountains,Gansu of China from low to high altitude.We set up sample plots on typical vegetation along these belts,and use the semimicro Kjeldahl,Sodium hydroxide and Mo-Sb anti-colorimetric method,the CaCO3 molecular formula,soil drying method,ring sampler method to carry on correlation investigation and the analysis of soil different quality.The results showed that:1.Organic matter content of the desert grassland soil is only 1.65％,and total nitrogen and total phosphorus content are 0.14％ and 0.089％,and content was the lowest,while organic matter content of dry shrub grassland,mountain forest grassland,subalpine shrub meadow soil is similar and change between 10％ and 12％.2.The soil volume-weight in 0 ～ 60 cm deep of Picea crassifolia,alpine brushwood,Sabian przewalskii,the low mountain brushwood,meadowland,open ground is increased in turn from 0.53 g/cm3 to 1.02 g/cm3 accordingly,the soil porosity reduced from 72.64％ to 48.11％.3.The number of dominant species in different types of soils on the north slope of Qilian Mountains was first increased and then decreased with the increase of altitude,that is to say,the inverted U type distribution trend.Understanding and grasping the response relationship between characteristics of soil and vegetation vertical distribution,which can provide technical support for vegetation restoration.
NETL
NSTL
万方数据
维普
