新疆盐渍土渗透势与盐分的关系

干旱区研究 ›› 2013, Vol. 30 ›› Issue (6): 998-1003.

新疆盐渍土渗透势与盐分的关系

陈春秀^1,2, 田长彦¹

1.中国科学院绿洲生态与荒漠环境国家重点实验室,中国科学院新疆生态与地理研究所,新疆乌鲁木齐 830011;
2.中国科学院大学,北京 100049

收稿日期:2012-10-24 修回日期:2013-01-17 发布日期:2013-12-12
通讯作者: 田长彦. E-mail: tuanchy@ms.xjb.ac.cn
作者简介:陈春秀(1986-),女,硕士,主要从事土壤化学研究. E-mail: chenchunxiu24@126.com
基金资助:
新疆南部内陆盐碱地农业高效安全利用配套技术模式研究与示范/公益性行业(农业)科技专项(200903001)

Relationship between Osmotic Potential and Total Salt Content in Saline or Alkaline Soil in Xinjiang

CHEN Chun-xiu^1,2, TIAN Chang-yan¹

1. State Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, ChineseAcademy of Sciences, Urumqi 830011, Xinjiang, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2012-10-24 Revised:2013-01-17 Online:2013-12-12

摘要/Abstract

摘要： 采集新疆不同类型不同质地的盐渍土共30个采样点450份盐碱土土样,分别用土水比为1∶1和1∶5进行浸提,测得浸提土样渗透势、总盐、pH、主要离子含量等化学参数,研究土水比为1∶1和1∶5浸提液渗透势的相互转换关系以及渗透势和总盐的关系。结果表明:新疆盐渍土土水比为1∶1和1∶5之间的渗透势具有极显著线性相关性,两者相互转换方程式为:Ψs_1∶1=4.32Ψs_1∶5+0.007(R²=0.97,P<0.000 1);土水比为1∶1的土壤溶液渗透势与总盐的方程式为Ψs_1∶1=67.26-19.67ln(St_1∶1+30.46)(R²=0.96,P<0.000 1);土水比为1∶5的土壤溶液渗透势与总盐的方程式为Ψs_1∶5=232.59-39.82ln(St_1∶5+343.68)(R²=0.90,P<0.000 1)。这些方程能够很好地诊断新疆盐渍土的盐渍化程度,将对于我国盐渍土的改良应用以及盐生植物的种植具有重要意义。

关键词: 盐渍土, 渗透势, 土水比, 盐渍化程度, 新疆

Abstract: The relationship between osmotic potential and total soil salt content was used to indirectly describe soil salinization degree. Soil osmotic potential measured by extraction was closely related to the soil-water ratio. Therefore, it is very important for setting up the conversion relationships between osmotic potentials in 1∶1 and 1∶5 soil-water extracts. Four hundred and fifty saline or alkaline soil samples with different types and textures were collected in whole Xinjiang, and their osmotic potential (Ψs), total soil salt content (St), pH value, and main cation and anion concentrations in 1∶1 and 1∶5 soil-water extracts were determined. The results showed that osmotic potential in 1∶1 soil-water extract was significantly associated with that in 1∶5 one, and the conversion relationship could be expressed by equation Ψs_1∶1= 4.32Ψs_1∶5+0.007 (R²=0.97, P<0.000 1). The relationship between osmotic potential and total soil salt content (St) could be expressed by equation Ψs_1∶1=67.26-19.67ln(St_1∶1+30.46) (R²=0.96, P<0.000 1) in 1∶1 soil-water extract and by equation Ψs_1∶5=232.59-39.82ln(St_1∶5+343.68) (R²=0.90, P<0.000 1) in 1∶5 soil-water extract respectively. For improving saline or alkaline soil and growing halophytes, these equations can be used to quantitatively assess the degree of soil salinization in Xinjiang, and the study results can provide a scientific basis for further researching saline soil or alkaline soil in Xinjiang

Key words: saline or alkaline soil, osmotic potential, soil-water ratio, degree of soil salinization, Xinjiang

陈春秀, 田长彦. 新疆盐渍土渗透势与盐分的关系[J]. 干旱区研究, 2013, 30(6): 998-1003.

CHEN Chun-xiu, TIAN Chang-yan. Relationship between Osmotic Potential and Total Salt Content in Saline or Alkaline Soil in Xinjiang[J]. Arid Zone Research, 2013, 30(6): 998-1003.

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