Soil Salinity and Ion Contents on Peripheral Wetlands around Ebinur Lake
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摘要: 以艾比湖湿地边缘带为研究区域,对土壤中盐分离子进行定量测定,采用野外取样调查结合实验室分析,运用统计学方法,研究艾比湖湿地边缘带土壤盐分离子分布特征。结果表明:研究区所有样点土壤盐分值范围为:0.0629.69g·kg-1,差异较大;各层次土壤变异系数随土层深度增加而增大;05、520cm土层变异系数分别为0.99和0.93;2040、4060cm土层变异系数均为1.08;K++Na+和Cl-是主要的盐分离子,主要盐分包括Na2SO4、NaHCO3和NaCl。湿地边缘带土壤各盐分离子之间存在着一定的相关性,其中Cl-与K++Na+之间的相关系数最高,为0.997。研究区所有样点土壤盐分含量中值与均值差异较大,土壤盐分主要富集在表层;研究区各层次土壤的垂直分布中,05、520cm土层属于中等变异程度,2040、4060cm土层属于强变异程度;土壤盐分离子含量随土层深度的增加呈现递减趋势,其中SO2-4和Ca2+含量递减的趋势最为明显。Abstract: This study aimed to determine the spatial distribution of salt ions in the soil on the peripheral wetlands around Ebinur Lake in Xinjiang.Quantitative determination of salt ions in the soil was conducted by field sampling and analysis carried out in the laboratory.Statistical analysis and descriptive statistics were applied to characterize the soil salinity and ion content in the area.The results indicated that the soil salinities of all sampling points in the area ranged from 0.06g·kg-1 to 29.69g·kg-1,with significant variations among the different locations;the soil variation coefficient increased with increasing ground depth,e.g.,the coefficients were 0.99 and 0.93 in the 0-5cm and 5-20 cm layers of soil,respectively,while in the 20-40 cm and 40-60 cm layers they were both 1.08;Cl-and K++Na+were the main salt ions,and the salts included mostly Na2SO4,NaHCO3 and NaCl in the soil;the ion contents in the soil seemed to correlate to one another,with the highest correlation coefficient between Cland K++Na+at 0.997;and there was a significant difference between the median and the mean values on salt contents of all samples.It was concluded that the salt distribution in the soil was uneven,the highest being in the surface layer.The spatial distribution of salts indicated that 0-5cm and 5-20 cm layers had a medium degree of variation,and 20-40 cm and 40-60 cm layers had a high degree of variation.The salt ion contents decreased with increasing depth of soil,and SO42-and Ca2+were the most significant in that respect.
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Keywords:
- saltions /
- feature analysis /
- Ebinur lake wetland /
- peripheral area
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