面向敦煌市绿洲土壤质量评价的最小数据集构建研究

发布时间：2018-04-23 18:15

本文选题：敦煌市 + 干旱区　；参考：《土壤通报》2017年05期

【摘要】：地处极端干旱区的敦煌市绿洲在气候条件干旱和人类活动加剧的双重压迫下,土壤资源可持续发展面临着严峻的挑战。本研究基于实地调查数据、MODIS-NDVI和DEM数据,在综合分析土壤理化性质的基础上,选取了14项理化指标,利用最小数据集(MDS)方法,从坡向、植被覆盖度和高程3个方面对研究区的土壤质量进行了评价。研究结果表明:不同坡度条件下,土壤质量为阳坡高于阴坡,而阳坡与半阳坡间,阴坡与半阴坡间差异不大;植被覆盖度对土壤质量影响显著,即土壤质量随着植被覆盖度增高而变好;高程对土壤质量的影响具有两面性,随着海拔升高,土壤盐分降低的同时养分含量也在减少;而干旱气候导致土壤盐分偏高,含水量、有效氮和有机质含量显著偏低。此外,研究中基于MDS的方法,引入Norm值以避免仅用因子载荷作为唯一选择标准而导致的部分因子信息被忽略的缺点,在对MDS的可靠性进行验证显示,相关系数检验说明该方法具有很好的可行性。
[Abstract]:The sustainable development of soil resources in Dunhuang oasis, which is located in the extreme arid area, is faced with severe challenges under the dual oppression of drought and intensified human activities. Based on field survey data, MODIS-NDVI and DEM data, based on the comprehensive analysis of soil physical and chemical properties, 14 physical and chemical indexes were selected. The soil quality of the study area was evaluated from three aspects of vegetation coverage and elevation. The results showed that the soil quality of sunny slope was higher than that of shady slope, but there was little difference between sunny slope and semi-sunny slope, and vegetation coverage had a significant effect on soil quality. That is, the soil quality is improved with the increase of vegetation coverage; the influence of elevation on soil quality is dual. With the increase of altitude, the soil salinity decreases and the nutrient content decreases, while the dry climate leads to higher soil salinity and higher water content. The contents of available nitrogen and organic matter were significantly lower. In addition, based on the method of MDS, the Norm value is introduced to avoid the disadvantage of ignoring some factor information caused by using factor load as the sole selection criterion, and the reliability of MDS is verified. Correlation coefficient test shows that this method is feasible.
【作者单位】：陕西师范大学旅游与环境学院;地理学国家级实验教学示范中心(陕西师范大学);
【基金】：国家科技支撑项目《敦煌生态修复关键技术研究与示范》(2012BAC08B07)子课题《干湖盆植被修复技术试验与示范》陕西师范大学中央高校基本科研业务费创新团队项目(GK201101002)“干旱地区生态水文研究”资助
【分类号】：S159

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