Response of Soil Moisture of Desert Steppes to Precipitation Patterns in Damao Banner, Inner Mongolia

Fan Ting; Zhang Cunhou; Zhang Deguang; Su Yue

doi:10.13961/j.cnki.stbctb.2020.01.011

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Response of Soil Moisture of Desert Steppes to Precipitation Patterns in Damao Banner, Inner Mongolia

- Response of Soil Moisture of Desert Steppes to Precipitation Patterns in Damao Banner, Inner Mongolia
- Bulletin of Soiland Water Conservation Vol. 40, Issue 1, Pages: 72-77(2020)
- 作者机构：
  
  1. 内蒙古自治区气象局气象灾害监测预警与人工影响天气中心,内蒙古,呼和浩特,010051
  2. 内蒙古自治区气象局生态与农业气象中心,内蒙古,呼和浩特,010051
  3. 内蒙古自治区气象科学研究所,内蒙古,呼和浩特,010051
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.01.011
  CLC： S157;S152.7
- Published：2020
- 稿件说明：
移动端阅览
Fan Ting, Zhang Cunhou, Zhang Deguang, et al. Response of Soil Moisture of Desert Steppes to Precipitation Patterns in Damao Banner, Inner Mongolia[J]. Bulletin of Soiland Water Conservation, 2020, 40(1): 72-77.
DOI：

Fan Ting, Zhang Cunhou, Zhang Deguang, et al. Response of Soil Moisture of Desert Steppes to Precipitation Patterns in Damao Banner, Inner Mongolia[J]. Bulletin of Soiland Water Conservation, 2020, 40(1): 72-77. DOI： 10.13961/j.cnki.stbctb.2020.01.011.

摘要

[目的] 研究不同降水模式土壤水分响应机制，为防治荒漠草原植被退化及土地荒漠化提供理论基础。[方法] 以内蒙古自治区达茂旗为例，基于自动土壤水分观测站2016-2018年逐时土壤水分、降水量资料，利用统计学等方法，研究荒漠草原降水对土壤水分的影响。[结果] 对于5.1~10.0，10.1~25.0 mm和大于25 mm降水事件，土壤水分响应深度分别为10，20 cm和50 cm，响应天数分别为6，7~9 d和10 d。5.1~15.0 mm和20.1~25.0 mm的降水，降水强度越大，土壤水分入渗深度越大；15.1~20.0 mm的降水，降水强度越大，土壤水分入渗深度越小。5.1~15.0，15.1~20.0，20.1~25.0 mm降水事件，0-10 cm土壤水分在降水强度较小时，土壤水分均在1 h后显著响应；在降水强度较大时，土壤水分分别在5，8 h及8 h后显著响应。[结论] 土壤水分对降水响应主要依赖于降水模式，包括降水量、降水强度、降水时间等。5.1~15.0 mm和20.1~25.0 mm降水量时，降水强度对土壤水分入渗深度具有正反馈作用，对入渗速率具有负反馈作用；15.1~20.0 mm降水量时，降水强度对土壤水分入渗深度和速率均具有负反馈作用。

Abstract

[Objective] The response mechanism of soil moisture in moving dunes according to different precipitation patterns was discussed to provide a reference to prevent degraded vegetation and land desertification of grasslands on desert steppes.[Methods] With the desert steppe in Damao Banner of Inner Mongolia being used as an example ecosystem

based on the hourly soil moisture and precipitation of soil moisture at automatic observation stations from 2016 to 2018

statistical methods were used to study the effects of precipitation on soil moisture.[Results] When the precipitation intensity was lower

the soil moisture response depth was 10 cm

20 cm

and 50 cm

respectively. The days of the moisture response was 6 d

7-9 d

and 10 d accordingly when the precipitation amount was 5.1-10.0 mm

10.1-25.0 mm and >25.0 mm. The higher precipitation intensity led to deeper infiltration when the precipitation amount was 5.1-15.0 mm or 20.1-25.0 mm. When the precipitation was 15.1-20.0 mm

higher precipitation intensity corresponded to shallower infiltration. When the precipitation intensity was lower

the soil moisture of the 0-10 cm soil layer responded significantly after one hour regarding the number of total precipitation-amounts of 5.1-10.0 mm

15.1-20.0 mm

and 20.1-25.0 mm

respectively. However

when the precipitation intensity was higher

the soil moisture of the 0-10 cm soil layer responded significantly after 5 h

8 h

and 8 h

respectively.[Conclusion] The response of soil moisture to precipitation is mainly dependent on the precipitation pattern

including the precipitation amount

intensity

and duration. The intensity had positive feedback on soil moisture infiltration depth and negative feedback on soil moisture infiltration velocity when the precipitation amount was 5.1-15.0 mm or 20.1-25.0 mm. However

the precipitation intensity had a negative feedback on soil moisture infiltration depth and velocity when the precipitation amount was 15.1-20.0 mm.

关键词

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