干旱区生态环境知识资源中心(Arid): 黑河下游水土理化性质变化及生态环境意义

Arid

	黑河下游水土理化性质变化及生态环境意义
其他题名	Variations of Physical and Chemical Properties of Water and Soil and Their Significance to Ecosystem in the Lower Reaches of Heihe River
	刘蔚 1; 王忠静 1; 席海洋 2
ISSN	1000-0240
出版年	2008
卷号	30 期号:4 页码:688-696
中文摘要	对黑河下游不同类型沙漠化土地土壤的盐分进行了调查和分析. 结果表明: 潜在沙漠化土地土壤水化学类型为Cl~--SO~(2-)_4-Na~+-Mg~(2+)离子型土,正在发展的沙漠化土地为SO~(2-)_4-Cl~--Mg~(2+)-Na~+离子型土, 强烈发展的沙漠化土地为HCO--3-Cl~--Ca~(2+)-Na~+离子型土, 严重沙漠化土地为Cl~--SO~(2-)_4-Mg~(2+)-Na~+离子型土. 不同土壤中全N、全P、全K、 PH值和有机质含量差异较小, 而速效N、速效P和速效K养分含量差异较大;主成分分析显示, 全N、全P、有机质和速效N含量总贡献累计达76.24%. 黑河下游地区随着上中游水量的减少, 在强蒸发作用下, 地表水与浅层地下水的矿化度显著升高. 水文过程的改变, 使维系绿洲的水资源由平衡到失衡, 在水环境的恶化过程中, 周期性积盐作用, 使绿洲内的非盐渍化土壤向轻盐土发展、轻盐土向重盐土方向发展, 盐碱化土地不断扩展导致土地沙漠化程度增加. 上述各过程共同构成绿洲沙漠化复杂的地表动力学过程.
英文摘要	According to soil PH value,total soluble salt content,main iron types and their percentages,the soil desertification and water condition in the lower reaches of Heihe River can be divided into four types.The soil~-water chemical type of the potential desertification land is Cl~--SO~(2-)_4-Na~+-Mg~(2+) type,the on-going desertification land is SO~(2-)_4-Cl~--Mg~(2+)-Na~+ type,the strongly developed desertification land is HCO3-Cl~--Ca~(2+)-Na~+ type,the severe desertification land is Cl~--SO~(2-)_4-Mg~(2+)-Na~+ type,and mean salt content in a soil profile is 4.57%.;According to the analytical results of soils in desertification land in the downstream area,the total N,total P,total K and organic matter in soils are concentrated distributed;while the available N,P and K are dispersedly distributed.The cumulative contribution percentages of total N,total P,organic matter and available N reach up to 76.24%.According to the low-dimensional cluster analysis of principal components,the differentiation and the similarity of the integrated nutrient grades,the soils in the study area can be divided into four types.The four types of soils correspond to the four types of desertified land.;The salinity of surface water and shallow groundwater in the arid inland river basin has an increasing tendency due to decrease of water input from the upper reaches and strong evaporation.The changes in the hydrological process lead to unbalance of the water resources in the oasis system.The periodical accumulation of salts causes ecological deterioration and land desertification.So it is very important to deep study the water chemical properties in the upper and middle reaches,which is one of the important issues in relation to the evaluation of soil and vegetation environments dependent on water quality.
中文关键词	黑河下游 ; 水土壤理化性质 ; 环境意义
英文关键词	lower reaches of Heihe River physical and chemical properties of water and soil environmental significances
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:3357993
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222029
作者单位	1.清华大学, 水沙科学与水利水电工程国家重点实验室, 北京 100084, 中国; 2.中国科学院,寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	刘蔚,王忠静,席海洋. 黑河下游水土理化性质变化及生态环境意义[J]. 中国科学院西北生态环境资源研究院,2008,30(4):688-696.
APA	刘蔚,王忠静,&席海洋.(2008).黑河下游水土理化性质变化及生态环境意义.,30(4),688-696.
MLA	刘蔚,et al."黑河下游水土理化性质变化及生态环境意义".30.4(2008):688-696.