摘要
选择艾比湖湿地的博尔塔拉河,精河下游河岸带为研究区域,针对土壤中的速效钾进行定量测定,采用描述性统计法、地统计学方法和空间分析法,讨论研究区土壤速效钾的空间变异及分布特征。结果表明:在0~20 cm和40~60 cm土层速效钾空间变异中块金值与基台值之比分别为38.61%、32.63%,表明其空间变异性主要是随机性因素和结构性因素共同引起的,其空间分布体现为中等空间相关性。在20~40 cm土层块金值与基台值之比为17.09%,表明其空间变异性主要是结构性因素引起,其空间分布相关性很强,而在60~80 cm土层块金值与基台值之比为78.96%,表明其空间变异性主要是随机性因素引起,其空间分布相关性很弱。研究区土壤速效钾的取值范围在3.34~632.10 mg kg-1之间,差异很大。调查样地中37.19%的土壤样品速效钾含量3.34~34 mg kg-1之间,属极缺乏型和很缺乏型;31.70%的土壤样品速效钾含量34~68 mg kg-1之间,属很缺乏型和缺乏型,表明研究区速效钾含量整体偏低。土壤速效钾垂直分异规律为:随土层深度的增加而递减;速效钾含量水平分异规律为:精河区域、精博河间的中部区域】博河区域。
In this paper riparian zone of Bortala and Jinghe Rivers of Ebinur Lake wetland was selected as a study area. We measured the soil available K contents, and discussed the spatial variation and distribution characteristic of available K by the method of descriptive statistics, statistical methods and spatial analysis. The results showed that the spatial correlation of(0 ~ 20 cm and 40 ~ 60 cm) layers soil available K was moderately dependent, whose Nugget/Sill ratios were separately 38.61% and 32.63%. This indicated that spatial variability was affected by the structure factor and the stochastic factor together. In 20 ~ 40 cm layer, soil available K was highly dependent, whose Nugget/Sill ratio was 17.09%, which indicated that spatial variability was affected by the structure factor, but weakly dependent in the60 ~ 80 cm layer, whose Nugget/Sill ratio was 78.96%, which showed that spatial variability was affected by the stochastic factor. Soil available K contents in the study area varied significantly between 3.34 ~ 632.10 mg kg-1.According to the survey in the study area, the available K contents of 37.19% soil samples were extremely deficient and varied between 3.34 ~ 34 mg kg-1, 31.70% soil samples were deficient in available K contents ranging between34 ~ 68 mg kg-1. It depicts the overall level of soil available K contents are low. Vertical distributions of available K showed that soil available K contents decreased with the increasing soil depth. Horizontal distributions of soil available K contents are greater in Jinghe River and central area between Jinghe and Bortala Rivers than Bortala River.
出处
《土壤通报》
CAS
CSCD
北大核心
2015年第2期375-381,共7页
Chinese Journal of Soil Science
基金
国家自然科学基金"艾比湖湿地生态环境演变及生态恢复研究"(41171036)
国家自然科学基金重点项目新疆联合基金项目(U1138302-6)
新疆师范大学研究生科技创新项目基金(20142001)资助
关键词
艾比湖
湿地
速效钾
空间变异
Ebinur Lake
Wetland
Available K
Spatial variability
