梭梭和沙拐枣对风沙土壤水热盐动态的影响

发布时间：2018-04-09 13:25

  本文选题：塔克拉玛干沙漠　切入点：人工防护林　出处：《水土保持学报》2017年03期

【摘要】：为揭示塔克拉玛干沙漠公路防护林不同植物类型下土壤水热盐运移规律,于2015年5—9月采用CS656土壤水热盐三参数传感器对防护林内梭梭和沙拐枣根区土壤水分、盐分和温度进行实时监测,分析了气温与土壤温度的相互关系和土壤水盐动态变化规律。结果表明:(1)梭梭和沙拐枣根区土壤温度基本一致,气温与土壤温度呈极显著相关(p0.01),各土层间土壤温度相关性随深度的增加逐渐减弱;(2)受灌溉制度影响,防护林土壤水盐呈现出明显的周期性变化规律,梭梭和沙拐枣根区土壤水盐动态变化趋势相似。在垂直方向上呈单峰曲线,其峰值分别位于30,10cm土层处。其中,梭梭林下土壤可分为水分速变层、弱变层和稳定层3个土壤层次,而沙拐枣林下土壤可分为水分速变层和弱变层2个土壤层次;(3)灌溉后土壤湿润体均呈"半椭球形"分布,梭梭和沙拐枣根区土壤灌溉水影响深度分别为60,150cm,而土壤盐分呈"表聚型"分布,但尚未造成土壤盐渍化(1.0 mS/cm);(4)6—9月份梭梭根区土壤平均贮水量(116.34mm)略大于沙拐枣(100.99mm),土壤水分亏缺明显,都大于270mm。
[Abstract]:In order to reveal the water, thermal and salt transport laws of soil under different plant types in shelterbelt of Taklimakan Desert, the soil moisture of Haloxylon ammodendron and Jujube jujube root area in the shelterbelt was studied by CS656 three parameter sensor in May and September 2015.The relationship between air temperature and soil temperature and the dynamic variation of soil water and salt were analyzed.The results showed that the soil temperature of Haloxylon ammodendron and Jujube jujube was basically the same, the correlation between soil temperature and soil temperature was very significant, and the correlation between soil temperature and soil temperature decreased gradually with the increase of soil depth.The soil water and salt in shelterbelt showed obvious periodic variation law, and the dynamic change trend of soil water and salt was similar between Haloxylon ammodendron and Jujube jujube root area.In the vertical direction, there is a single peak curve, the peak value of which is located at 30 ~ 10 cm soil layer.Among them, the soil under Haloxylon ammodendron stands can be divided into three soil layers, I. e., the rapid changing layer of water, the weak layer and the stable layer.The soil under the jujube forest can be divided into two layers, I. e., the rapid and weak layer. The soil wetting body is distributed in the shape of "half ellipsoid" after irrigation.The influence depth of soil irrigation water was 60150 cm in the root area of Haloxylon ammodendron and Jujube jujuba, respectively, and the distribution of soil salt was "apparent aggregation".However, soil salinization was not caused by 1.0 MS / cm ~ (-1) soil average water storage in the root zone of Haloxylon ammodendron in June and September (116.34mm), which was slightly higher than that of Apocynum angustifolia (100.99mm), and the soil water deficit was more than 270mm.
【作者单位】： 中国科学院新疆生态与地理研究所;中国科学院大学;西北农林科技大学资源环境学院;
【基金】：国家千人计划新疆项目(Y472241001) 国家自然科学基金项目(41471222,31300449)
【分类号】：S714
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本文编号：1726614