Responses of Soil Moisture to Precipitation Under Three Typical Land-Use Patterns in Desert Steppe

CHEN Lin; SONG Naiping; YANG Xingguo; LI Xuebin

doi:10.13870/j.cnki.stbcxb.2022.02.020

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Responses of Soil Moisture to Precipitation Under Three Typical Land-Use Patterns in Desert Steppe

更新时间：2024-11-07

- Responses of Soil Moisture to Precipitation Under Three Typical Land-Use Patterns in Desert Steppe
- Vol. 36, Issue 2, Pages: 153-160(2022)
- 作者机构：
  
  1. 宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川,750021
  2. 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川,750021
  3. 宁夏大学生态环境学院,银川,750021
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.020
  CLC： S152.7
- Published：2022
- 稿件说明：
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CHEN Lin, SONG Naiping, YANG Xingguo, et al. Responses of Soil Moisture to Precipitation Under Three Typical Land-Use Patterns in Desert Steppe[J]. 2022, 36(2): 153-160.
DOI：

CHEN Lin, SONG Naiping, YANG Xingguo, et al. Responses of Soil Moisture to Precipitation Under Three Typical Land-Use Patterns in Desert Steppe[J]. 2022, 36(2): 153-160. DOI： 10.13870/j.cnki.stbcxb.2022.02.020.

摘要

降水是荒漠草原生态系统重要的水分来源

也是不同时空尺度上各种生物过程的重要驱动因子。为了解荒漠草原土壤水分对降水的响应

以3种典型土地利用方式(天然草地、灌木地和沙地)为研究对象

研究荒漠草原降水事件对不同土地利用类型土壤水分的影响。结果表明:研究期内降水量以<5 mm的小降水事件为主

发生次数占总事件的72%;从降水强度来看

<10 mm/h的降水事件居多

达到86%。0~250 cm的平均土壤含水量以沙地最高

灌木林和天然草地的平均土壤含水量几乎相等

但天然草地平均土壤含水量的波动较大。3种土地利用类型下

表层(<10 cm)土壤含水量波动较大

深层(>80 cm)土壤含水量则相对稳定。与草地和灌木地相比

沙地湿润锋响应最快

入渗深度最大。在102.6 mm的降水量条件下

天然草地累计入渗量最大(7.36 mm)

其次为沙地(3.47 mm)

灌木林地入渗量最低(2.64 mm)。因此

从最大蓄存和有效利用降水资源的角度来看

荒漠草原生态恢复过程中构建草地是该区域可以选择的土地利用方式。

Abstract

Precipitation is an important source of water in desert steppe ecosystem

and is also an important driving factor of various biological processes on different spatial and temporal scales. In order to understand the response of desert steppe soil moisture to precipitation

this study took three typical land use patterns (natural grassland

shrub land and sandy land) in desert steppe as research objects to study the effect of precipitation events on soil moisture under different land use types. The results showed that precipitation in the study period was mainly small precipitation events less than 5 mm

accounting for 72% of the total. Judging from the precipitation rate

precipitation events less than 10 mm/h were the majority

reaching 86%. The average soil water content of 0~250 cm was highest in sandy land. The average soil water contents of shrub forest and natural grassland were almost equal

but the average soil water content of natural grassland fluctuated greatly. Under the three types of land use

the soil water content fluctuated greatly in the surface layer (<10 cm)

while it was relatively stable in the deep (>80 cm). Compared with grassland and shrub land

the wet front of sand had the fastest response and the largest infiltration depth. Under the rainfall of 102.6 mm

the cumulative infiltration amount of natural grassland was the largest (7.36 mm)

followed by sand (3.47 mm)

and shrub land (2.64 mm). Therefore

from the point of view of maximum storage and effective utilization of precipitation resources

natural grassland should be a land use type worthy of selection during the ecological restoration and reconstruction of desert steppe.

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