民勤绿洲盐生草生境土壤盐分特征及离子组成
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国家自然科学基金项目"石羊河下游(民勤)典型荒漠植物适应逆境胁迫的调控机制研究"(31160118);兰州城市学院教学研究项目(2012-JY-40)


Characteristics of Soil Salinity and Ion Composition in Habitat Soil of Halogeton Glomeratus in Minqin Oasis
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    摘要:

    对民勤绿洲盐生草周围不同距离范围内的总体盐分状况、盐分离子组成及离子之间的相关性进行了研究。结果表明,盐生草具有一定的聚盐作用,在其周围形成了一定的"盐岛"效应。在距盐生草0-60 cm范围内,土壤剖面中的土壤盐渍化程度随土层的加深而加重,土壤阴离子主要有Cl-和SO42-,阳离子主要有Na+和Ca2+,土壤盐分主要是氯化钠、氯化钙、硫酸钠和硫酸钙,其次是氯化镁和硫酸镁。其中在盐生草周围0-40 cm范围内,垂直剖面0-20 cm土层土壤全盐含量为0.98~1.52 g/kg,属于非盐渍化土壤,20-40 cm土层土壤全盐含量达到了2.25~2.30 g/kg,属于轻度盐渍化土壤,40-60 cm土层土壤全盐含量达到了3.10~3.16 g/kg,属中度盐渍化;在距盐生草60 cm处,垂直剖面0-40 cm土层土壤全盐含量为0.83~1.86 g/kg,属非盐渍化,40-60 cm土层土壤全盐含量达到了2.43 g/kg,属轻度盐渍化。除HCO3-外,土壤盐分含量与各盐分离子之间均呈极显著正相关。

    Abstract:

    Soil total salt, salt ions composition and correlations of different salt ions in habitat of Halogeton glomeratus in Minqin Oasis were studied. Results showed that H. glomeratus can accumulate salts and formed a certain salt island around its habitat. In the horizontal direction 0-60 cm away from H. glomeratus, the soil salinization degree aggravated with soil depth increases in 0-60 cm on the soil profile, among which anions were mainly Cl-, and SO42- and cations were Na+ and Ca2+. The main soil salinity were sodium chloride, calcium chloride, sodium sulfate and calcium sulfate, followed by magnesium chloride and magnesium sulfate. In 0-40 cm distance away from plant, the total salinity contents of the 0-20 cm soil layer on the soil profile were 0.98~1.52 g/kg and belonged to non-salinization soil, while that of the 20-40 cm and 40-60 cm soil layers were 2.25~2.30 g/kg and 3.10~3.16 g/kg, which belonged to light salinization soil and medium salinization soil, respectively. Furthermore, in the horizontal direction 60 cm distance away from the H. glomeratus, the total salinity content of 0-40 cm and 40-60 cm soil layers on the soil profile were 0.83~1.86 g/kg and 2.43 g/kg, which belonged to non-salinization and light salinization. There were extremely significantly positive correlations between soil salt content and ions contents except the content of HCO3-.

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张鸣,张力,石晓妮,叶鹤琳,李雪,高天鹏.民勤绿洲盐生草生境土壤盐分特征及离子组成[J].水土保持通报,2014,(6):231-235

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  • 收稿日期:2014-01-10
  • 最后修改日期:2014-01-21
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  • 在线发布日期: 2016-04-05
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