摘要
塔里木河中下游湿地及其周边土壤粒度组成、粒度参数及分维值的分析计算结果表明：其土壤粒度多为以粗粉沙-极细沙-细沙为主的颗粒组成，是沙质或粉沙质壤土；少数以粘粒-极细粉沙-细粉沙为主要成分，属壤质沙土或粉沙土。发育不同植被类型湿地及周边土壤剖面质地垂向变化及粒度参数φ1、Mz和σ值存在差异，反映了不同土地类型和植被类型及盖度对土壤粒度特征的影响。研究样地土壤粒度分维值总体上的相近和类型间分维值变异系数的差异，进一步显示出这些土壤的成土来源和沉积过程的不同。
As the longest continental river in China and one of the famous continental rivers in the world, the Tarim River is located in the Tarim Basin in south Xinjiang, China. The length of its mainstream from the converging place of the Aksu River, Yarkant River and Hotan River to the Taitema Lake is 1 321 km, and its catchment area is 9.206×10^5 km^2. It is extremely arid in the middle and lower reaches of the Tarim River, the annual precipitation varies in a range of 17.4～42.0 mm, but the annual evaporation is as high as 2 500～3 000 mm, and the average annual days of occurring strong winds, dust storms, blowing sands and floating dusts are 16.0, 9.9, 40.4 and 43.5 days respectively. This paper analyzes the distribution, parameters and fractal dimensional values of the granularity of 70 soil samples from 16 plots in the wetlands and their peripheral regions in the middle and lower reaches of the Tarim River. The results show that the soil textures of most samples are mainly the sandy loams or silty loams consisted of coarse silts, extremely fine sand and fine sand, and a few samples are mainly loamy sandy soils or loamy silt＇soils consisted of clay, extremely fine silts and fine silts. The vertical variation of the textures and the parameters of q^l, Mz and c for the soil profiles in the wetlands and the peripheral regions with the different vegetation types are different, which reveals that the effects of different land types, vegetation types and coverages on the characteristics of soil granularity are different. The change extent of the fractal dimensional values of soil granularity in the study area is not so high, and the range is different from the different soils, which further reveal the difference in soil formation sources and soil deposition.
出处
《干旱区地理》
CSCD
北大核心
2005年第5期609-613,共5页
Arid Land Geography
基金
国家自然科学基金(40271011)
研究所绿洲学者"博士人才"培养计划项目(20052109)
关键词
粒度组成及参数
空间分布
湿地土壤
塔里木河中下游
spatial distribution
soil granularity
wetland
peripheral region
middle and lower reaches of the Tarim River
