[1]罗 叙,李建平,张 翼,等.荒漠草原土壤水分时空变化对降水变化的响应[J].水土保持研究,2021,28(04):142-150.
　LUO Xu,LI Jianping,ZHANG Yi,et al.Response of Spatial and Temporal Variation of Soil Moisture to Precipitation Change in Desert Steppe[J].Research of Soil and Water Conservation,2021,28(04):142-150.
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荒漠草原土壤水分时空变化对降水变化的响应

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 28 期数: 2021年04期 页码: 142-150 栏目: 出版日期: 2021-08-10
Title:
Response of Spatial and Temporal Variation of Soil Moisture to Precipitation Change in Desert Steppe
文章编号:
1005-3409(2021)04-0142-09
作者:
罗 叙1, 李建平1,2, 张 翼1, 井 乐1, 王誉陶1, 张 娟1
(1.宁夏大学 农学院, 银川 750021; 2.西北退化生态系统恢复与重建国家重点实验室培育基地, 银川 750021)
Author(s):
LUO Xu1, LI Jianping1,2, ZHANG Yi1, JING Le1, WANG Yutao1, ZHANG Juan1
(1.School of Agriculture, Ningxia University, Yinchuan 750021, China; 2 Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China)
关键词:
荒漠草原;  降水变化;  不同土层;  土壤含水量;  变异系数;  植被特征
Keywords:
desert steppe;  precipitation variation;  different soil layers;  soil moisture content;  coefficient of variation;  vegetation characteristics
分类号:
P426.6
文献标志码:
A
摘要:
为了探讨荒漠草原土壤水分时空变化对降水变化的响应,以毛乌素沙地南缘荒漠草原为研究对象,利用人工遮雨棚和人工补水的方式模拟了5个不同的降水梯度处理(正常降水的33%,66%,100%,133%和166%),采用TDR技术监测0—200 cm土层土壤含水量,系统研究了降雨变化对荒漠草原土壤水分滞留规律。结果表明:(1)各降水处理下土壤含水量均在7月份达到最大值,且正常降水处理的土壤含水量高于其他降水处理。(2)不同土层土壤含水量对降雨变化的响应不同,0—40 cm土层含水量对降雨量最为敏感,40—80 cm土层水分比较稳定,随着土层深度的增加含水量增加,在120—200 cm土层水分值最大。(3)不同降水处理之间土壤水分变异系数波动范围较小,深层土壤含水量变异系数值相对较小。(4)降水增加提高了植被密度和生物量。(5)降雨量与土壤水分呈正相关关系; 控雨处理下,大气温度与浅层土壤水分呈正相关。因此,全面探讨降水量对荒漠草原土壤水分时空变化的影响,需要考虑降雨季节与土层深度的交互作用,以及区域植被类型的特殊性。
Abstract:
In order to investigate the response of spatial and temporal variation of soil moisture to precipitation in desert steppe, the desert grassland in the southern Mu Us sandy land as the research object, we used the way of artificial awnings and artificial filling water to simulate the 5 different precipitation gradients(33%, 66%, 100%, 133% and 166% of normal precipitation), to monitor soil moisture content in 0—200 cm soil layer by TDR technology, and to systematically examine effect of rainfall on change patterns of soil moisture retention in desert grassland. The results show that:(1)the soil moisture contents in all precipitation treatments reached the maximum values in July, and the soil moisture content in normal rainfall treatment was higher than that in other precipitation treatments;(2)soil moisture contents of different soil layers had different responses to rainfall changes, the moisture content of surface soil(0—40 cm)was the most sensitive to rainfall, soil moisture in 40—80 cm layer was relatively stable, with the increase of soil depth, the water content in the 120—200 cm layer was the largest;(3)the variation coefficient of soil moisture fluctuated in a small range between different precipitation treatments, while the variation coefficient of soil moisture content in deep layer was relatively small;(4)precipitation resulted in the increases of vegetation density and biomass;(5)there was a positive correlation between rainfall and soil moisture; under rain-controlled treatment, atmospheric temperature was positively correlated with shallow soil moisture. Therefore, in order to comprehensively explore the effects of precipitation on the spatial and temporal variation of soil moisture in desert steppe, it is necessary to consider the interaction between rainfall season and soil depth as well as the particularity of regional vegetation types.

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备注/Memo

收稿日期:2020-08-21 修回日期:2020-09-30
资助项目:国家自然科学基金(31660143); 宁夏自然科学基金(2019AAC03042); 宁夏大学草学一流学科建设项目(NXYLXK2017A01)
第一作者:罗叙(1995—),男,甘肃白银人,在读硕士研究生,研究方向为草地生态、资源与环境。E-mail:2278890189@qq.com
通信作者:李建平(1982—),男,陕西延安人,博士,副教授,硕士生导师,主要从事草原生态、模型构建与模拟分析研究。E-mail:lijianpingsas@163.com

更新日期/Last Update: 2021-08-20