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中国沙漠 ›› 2025, Vol. 45 ›› Issue (4): 67-74.DOI: 10.7522/j.issn.1000-694X.2025.00096

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科尔沁沙地沙质草地土壤水分时间序列分析

姚淑霞1,2(), 张铜会2(), 赵传成1,2   

  1. 1.兰州城市学院,甘肃 兰州 730070
    2.中国科学院西北生态环境资源研究院,甘肃 兰州 730000
  • 收稿日期:2025-05-19 修回日期:2025-06-26 出版日期:2025-07-20 发布日期:2025-08-18
  • 通讯作者: 张铜会
  • 作者简介:姚淑霞 (1980—),女,甘肃灵台人,博士,教授,主要从事半干旱区生态水文学研究。E-mail: yaoshuxia@163.com
  • 基金资助:
    国家自然科学基金项目(31960273)

Time series analysis of soil moisture in sandy grassland of Horqin Sandy Land

Shuxia Yao1,2(), Tonghui Zhang2(), Chuancheng Zhao1,2   

  1. 1.Lanzhou City University,Lanzhou 730070,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received:2025-05-19 Revised:2025-06-26 Online:2025-07-20 Published:2025-08-18
  • Contact: Tonghui Zhang

摘要:

采用时间序列分析方法,对科尔沁沙地沙质草地2017—2019年生长季不同土层土壤水分与降水、蒸发之间的相关关系进行了研究。结果表明:(1)40~100 cm土层的容重较小,基本小于1.53 g·cm-3,而其有机质含量较高,均大于3.3 g·kg-1;0~20 cm土层的中粗沙含量最高,几乎为50%,而其余各土层基本以细沙含量较高;随土层深度增加,中粗沙含量逐渐减少,而黏粉粒含量逐渐增加。(2)同期降水和蒸发分析显示,3年的生长季均8月降水最多,5月蒸发最高;通过自相关分析发现,降水和蒸发序列的自相关系数均很小,说明这两个序列均为不相关序列。(3)土壤水分统计分析显示,0~20 cm和100~140 cm土壤水分较少;土壤水分标准差和变异系数随土层深度的增加总体呈逐渐减少趋势,说明深层土壤水分含量较为稳定;自相关分析表明,不同土层土壤水分含量具有较高的自相关性,特别是60 cm以下。随着滞后时距的增加,各土层土壤水分含量的自相关性逐渐减弱。(4)降水量与浅层土壤(<60 cm)水分含量的相关系数大于与深层的,随着滞后时距的增加,不同土层降水量与土壤水分含量之间的相关性呈减弱趋势;不同土层土壤水分含量与降水量的相关性不同,说明不同土层受降水的影响在时间上具有差异性。(5)浅层土壤水分含量与蒸发量之间存在显著的负相关,且随着滞后时距的增加,各土层土壤水分含量与蒸发量之间的相关性较为复杂。

关键词: 土壤水分, 时间序列分析, 沙质草地, 科尔沁沙地

Abstract:

The time series analysis method was adopted to study the correlation between soil moisture at different soil depths and precipitation, evaporation during the growing season from 2017 to 2019 in the sandy grassland of Horqin Sandy Land. The results show that: (1) The bulk density of the 40-100 cm soil layer is relatively small, basically below 1.53 g·cm-3, while its organic matter content is relatively high, all above 3.3 g·kg-1. The content of medium-coarse sand in the 0-20 cm layer is the highest, almost 50%, while the content of fine sand is the highest in the rest of the soil layers. With the increase of soil depth, the content of medium-coarse sand gradually decreases, while the content of silt-clay particles gradually increases. (2) The analysis of precipitation and evaporation in the same period shows that the precipitation in August is the highest in the three-year growing season, while the evaporation in May is the highest. Through autocorrelation analysis, it is found that the autocorrelation coefficients of precipitation and evaporation sequences are very small, indicating that the two sequences are irrelevant. (3) The statistical characteristics analysis of soil moisture shows that the soil moisture in 0-20 cm and 100-140 cm is relatively low. The standard deviation and coefficient of variation of soil moisture generally show a gradual decreasing trend with the increase of soil depth, indicating that the deep soil moisture is relatively stable. Autocorrelation analysis shows that soil moisture in different soil layers has high autocorrelation, especially below 60 cm. With the increase of lag time, the autocorrelation of soil moisture in each soil layer gradually weakens. (4) The correlation coefficient between precipitation and shallow soil (<60 cm) moisture is greater than that between precipitation and deep soil moisture. With the increase of lag time, the correlation between precipitation and soil moisture in different soil layers shows a weakening trend. The correlation between soil moisture in different soil layers and precipitation is different, indicating that the influence of precipitation on different soil layers is different in time. (5) There is a significant negative correlation between shallow soil moisture and evaporation, and with the increase of lag time, the correlation between soil moisture in each soil layer and evaporation becomes more complex.

Key words: soil moisture, time series analysis, sandy grassland, Horqin Sandy Land

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