| 张体彬,康跃虎,胡伟,窦超银.基于主成分分析的宁夏银北地区龟裂碱土盐分特征研究[J].干旱地区农业研究,2012,30(2):39~46 |
| 基于主成分分析的宁夏银北地区龟裂碱土盐分特征研究 |
| Studies on salinity characteristics of takyric solonetz in Ningxia Yinbei region based on principal component analysis |
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| DOI：10.7606/j.issn.1000-7601.2012.02.07 |
| 中文关键词: 龟裂碱土 盐分特征 主成分分析 |
| 英文关键词:takyric solonetz salinity characteristics principal component analysis |
| 基金项目:中国科学院西部行动计划项目（KZCX2-XB2-13）; 中国科学院百人计划项目 |
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| 中文摘要: |
| 为探明宁夏银北地区龟裂碱土的盐分状况，并构建滴灌利用龟裂碱土过程中具有代表性和限制性的盐分特征因子，利用经典统计和主成分分析方法对龟裂碱土原状土剖面和滴灌利用下的土壤盐分特征进行了研究。结果表明，龟裂碱土剖面盐分离子含量总体呈现“T”字型分布，0～40 cm土壤SAR值较大，均高于15(mmol/L)0.5，土壤pH值9.5左右；Cl-和Na+是该土壤中最主要的阴阳离子；HCO3-含量在100 cm以下的土层中逐渐增加；土壤可溶性总盐(TSS)与Cl-和Na+的相关性较大，相关系数分别为0.967和0.910(P<0.01)，TSS与饱和浸提液电导率（ECe）亦存在着显著的正相关(P<0.01)；主成分分析表明影响土壤利用的4个主成分依次为土壤盐化状况、土壤结构状况、土壤碱化特征以及除Na+、Mg2+和Ca2+等离子之外的其它离子含量状况，其累积方差贡献率为87.18%。由此可见，在宁夏银北地区龟裂碱土具有干旱区盐碱土壤盐分表聚特征，在利用过程中仍需要首先降低土壤盐度，通过改变离子组成减小土壤碱度，改善土壤结构。 |
| 英文摘要: |
| In order to investigate the basic salinity conditions and the dominant, restrictive factors of salinity characteristics of takyric solonetz under drip irrigation in Ningxia Yinbei Region, classical statistical analysis and principle component analysis (PCA) was applied to explore the salinity characteristics of takyric solonetz utilized by drip irrigation. The results showed that the salt ions content distributed as a “T” letter in soil profile of takyric solonetz. SAR in 0～40 cm soil was above 15 (mmol/L)0.5, and pH values about 9.5. Na+ and Cl- were the dominant cation and anion respectively in the soil, and HCO3- content increased gradually in the soils below 100 cm. Total soluble salt (TSS) in the soil had the strangest correlation with the contents of Cl- and Na+, the correlation coefficients were 0.967 and 0.910(P<0.01), meanwhile the positive correlation between TSS and the electrical conductivity of saturation paste extracts (ECe) was significant at 0.01 level. The results of PCA showed that four principle components, which could explain 88.28% of the total variance, represented the saline condition, structure condition, alkaline characteristics and
the contents of ions other than key ions such as Na+, Mg2+ and Ca2+ in solonetz, respectively, affected the utilization of takyric solonetz. For the reasons above, like other salt-affected soils in arid regions, takyric solonetz in Ningxia Yinbei region had the characteristics of the salt accumulation at surface siol layers. To decrease the salinity should be the first step in the utilization, and next, reduce the alkalinity, ameliorate the soil structure through changing the salt components. |
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