半干旱地区半流动沙丘水分深层渗漏量及其对降雨格局的响应

doi:10.13287/j.1001-9332.202008.011

应用生态学报 ›› 2020, Vol. 31 ›› Issue (8): 2710-2720.doi: 10.13287/j.1001-9332.202008.011

半干旱地区半流动沙丘水分深层渗漏量及其对降雨格局的响应

王宇祥¹, 刘廷玺^1,2*, 段利民^1,2, 童新^1,2, 王冠丽^1,2, 李东方^1,2

¹内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018;
²内蒙古自治区水资源保护与利用重点实验室, 呼和浩特 010018

收稿日期:2020-03-17 修回日期:2020-05-19 出版日期:2020-08-15 发布日期:2021-02-15
通讯作者: * E-mail: txliu1966@163.com
作者简介:王宇祥, 男, 1994年生, 硕士研究生。主要从事半干旱地区降水入渗研究。E-mail: 18347927303@163.com
基金资助:
国家自然科学基金重点国际合作研究项目(51620105003)、国家自然科学基金地区项目(51869017,51769020,51669017)、国家自然科学基金重点项目(51139002)、教育部创新团队发展计划项目(IRT_17R60)、科技部重点领域科技创新团队项目(2015RA4013)、内蒙古自治区草原英才产业创新创业人才团队项目和内蒙古农业大学寒旱区水资源利用创新团队项目(NDTD2010-6)资助

Deep water leakage from semi-mobile dunes in semi-arid regions and its response to rainfall patterns

WANG Yu-xiang¹, LIU Ting-xi^1,2^*, DUAN Li-min^1,2, TONG Xin^1,2, WANG Guan-li^1,2, LI Dong-fang^1,2

¹College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
²Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China

Received:2020-03-17 Revised:2020-05-19 Online:2020-08-15 Published:2021-02-15
Supported by:
This work was supported by the International Cooperation Project (51620105003), the Region Program (51869017, 51769020, 51669017), the Key Program (51139002) of National Natural Science Foundation for the Key Program of China, the Ministry of Education Innovation Research Team (IRT_17R60), the Innovation Team in Priority Areas Accredited by the Ministry of Science and Technology (2015RA4013), the Inner Mongolia Industrial Innovative Research Team, and the Inner Mongolia Agricultural University Innovative Research Team of Water Resource in Cold and Dry Area (NDTD2010-6).

摘要/Abstract

摘要： 降雨是荒漠化地区土壤水分的主要补给源,对土壤水分的变化有着深远影响,在沙区深层土壤水分补给中具有重要作用。本研究基于参数优化后的Hydrus-1D模型,分析了半干旱的科尔沁沙地半流动沙丘200 cm深层渗漏量的动态变化过程及其对降雨格局的响应关系。结果表明: 2016—2019年4—10月,半流动沙丘的年均渗漏补给量为254.31 mm,占同期降雨量的61.8%。深层渗漏主要发生在6—8月,该期渗漏量占比72.8%;渗漏速率变化在0.03～2.70 mm·h^-1,最大渗漏速率发生在降雨量大、频次高的降雨事件下。降雨入渗补给深层土壤水受到降雨量、降雨强度、降雨历时及前期土壤水分含量的影响,历时长、雨强小的降雨事件更有利于水分深层渗漏,渗漏量与降雨量呈显著正相关关系(R²=0.85),16～18 mm降雨量是产生土体200 cm深度渗漏的阈值。高频次降雨事件通常在17～38 h后达到渗漏速率峰值,整个渗漏过程长达164 h以上。深层渗漏量的准确估算对荒漠化地区水资源评价和生态建设具有理论和现实意义。

关键词: 降雨入渗, Hydrus-1D, 降雨量, 降雨频次, 渗漏补给系数

Abstract: As the main source of soil moisture supply in desertified areas, rainfall has a profound impact on soil moisture changes and plays an important role in deep soil moisture replenishment. Based on the Hydrus-1D model with optimized parameters, we analyzed the dynamic change process of the leakage in the 200 cm deep layer of the semi-mobile dunes in Horqin Sandy Land and its response to the rainfall patterns. The results showed that the averaged leakage replenishment of semi-mobile dunes was 254.31 mm from April to October each year during 2016 to 2019, accoun-ting for 61.8% of the rainfall in the same period. Deep leakage mainly occurred from June to August, accounting for 72.8% of the total. The leakage rate was distributed between 0.03-2.70 mm·h^-1, with the maximum leakage rate occurring under heavy rainfall and frequent rainfall events. The deep soil water supplied by rainfall infiltration was affected by the amount of rainfall, rainfall intensity, duration of precipitation and soil moisture content in the earlier period. Precipitation events with long duration and small rainfall intensity were more conducive to deep water lea-kage, with a significant positive correlation between the leakage and rainfall (R²=0.85). 16-18 mm rainfall was the threshold for the leakage of 200 cm soil depth. The high-frequency rainfall event usually reached peak after 17-38 hours, with the entire leakage process being more than 164 hours. Accurate estimation of deep leakage has theoretical and practical significance for water resource assessment and ecological construction in desertified areas.

Key words: rainfall infiltration, Hydrus-1D, rainfall, frequency of rainfall, leakage supply coefficient

王宇祥, 刘廷玺, 段利民, 童新, 王冠丽, 李东方. 半干旱地区半流动沙丘水分深层渗漏量及其对降雨格局的响应[J]. 应用生态学报, 2020, 31(8): 2710-2720.

WANG Yu-xiang, LIU Ting-xi, DUAN Li-min, TONG Xin, WANG Guan-li, LI Dong-fang. Deep water leakage from semi-mobile dunes in semi-arid regions and its response to rainfall patterns[J]. Chinese Journal of Applied Ecology, 2020, 31(8): 2710-2720.

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半干旱地区半流动沙丘水分深层渗漏量及其对降雨格局的响应

Deep water leakage from semi-mobile dunes in semi-arid regions and its response to rainfall patterns

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