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| 于田绿洲不同季节表层土壤盐渍化程度的空间变异特征 |
| 宋玉1,2,塔西甫拉提·特依拜1,2，吴雪梅1,2，姜红涛1,2，陶兰花1,2，周梅1,2，买买提·沙吾提1,2 |
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| （1.新疆大学资源与环境科学学院, 新疆 乌鲁木齐 830046; 2.新疆大学绿洲生态教育部重点实验室, 新疆 乌鲁木齐 830046） |
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| 摘要: |
| 以于田绿洲为对象，运用地统计学和经典统计学的方法，结合实地野外考察数据，对研究区2012年春、夏两季表层土壤盐渍化程度的空间变异性进行分析。结果表明：(1) 对研究区24个样本点表层土壤含盐量进行描述性统计分析，得出5月和7月的表层土壤含盐量均值为18.2 g·kg-1，判断于田绿洲土壤为重盐土类型。5月土壤含盐量变异系数为115.6%，7月为109.5%，都属于强空间变异性。(2) 由半方差函数分析得到研究区5月和7月的块金值和基台值之比均小于25%，判断表层土壤含盐量的空间分布表现为强相关性，且5月的理论模型拟合要优于7月的。(3) 对于田绿洲2012年土壤表层含盐量和地下水位埋深进行普通克里格插值看出，春季到夏季有相同的变化趋势，在绿洲内部，地下水位埋深较深，含盐量较低，土壤碱性小；而绿洲外围地区，地下水位埋深较浅，含盐量较高，相应的碱性较高。 |
| 关键词: 土壤含盐量；空间变异；地下水埋深；半方差函数；地统计学；Kriging插值 于田绿洲 |
| DOI： |
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| 基金项目:国家自然科学基金（U1138303）；教育部长江学者和创新团队(IRT1180) |
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| Analysis of seasonal variation of topsoil salinization in Yutian Oasis |
| SONG Yu1,2, Tashpolat TIYIP1,2, WU Xue-mei1,2, JIANG Hong-tao1,2, TAO Lan-hua1,2, ZHOU Mei1,2, Mamat Sawut1,2 |
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| Abstract: |
| Based on the open field measured data, with the aid of the conventional statistics and geo-statistics analysis method, this paper takes Yutian Oasis as study area and analyses the distribution of the topsoil salinization degrees in spring and summer of 2012 in this area. The results reveal that (1) Through statistical parameter analysis, Yutian Oasis belongs to strongly salinized area, where the topsoil salt content averages 18.2 g·kg-1, the coefficient of variation is between 109.5%～115.6%, belonging to the strong spatial variability. (2) By the judge of semivariogram analysis, the surface spatial distribution of soil salinity shows a strong correlation. (3) Through Kriging method analysis, the conclusion shows that in the oasis, the soil surface salinity from spring to summer has the same tendency; Inside the oasis, as the underground water is deeply buried, the salt content is lower, and the soil alkaline is small; While in the surrounding area of the oasis, as the depth of underground water is shallow, the salt content is higher, and the soil alkaline is simultaneously higher. |
| Key words: topsoil salinity spatial variability depth of under ground water semi-variance geostatistical analysis Kriging interpolation Yutian Oasis |
