文献类型：期刊文献

中文题名：白刺(Nitraria tangutorum)灌丛沙堆干沙层土壤水分动态及其对小雨事件的响应

英文题名：Soil Moisture Dynamics in Dry Sand Layers of Nitraria tangutorum Nebkha and Its Responses to Small Rainfall Events

作者：李新乐[1,2] 安景源[1] 王丹阳[1] 刘雅婧[1] 辛智鸣[1] 吴波[2]

第一作者：李新乐

机构：[1]中国林业科学研究院沙漠林业实验中心/内蒙古磴口荒漠生态系统国家定位观测研究站,内蒙古巴彦淖尔015200;[2]中国林业科学研究院生态保护与修复研究所/国家林业和草原局荒漠生态系统与全球变化重点实验室,北京100091

年份：2022

卷号：44

期号：5

起止页码：20-30

中文期刊名：中国草地学报

外文期刊名：Chinese Journal of Grassland

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中国林业科学研究院基本科研业务费专项(CAFYBB2020MB007);内蒙古自治区科技计划项目(2020GG0127)。

语种：中文

中文关键词：白刺灌丛沙堆;干沙层;土壤水分动态;小雨事件

外文关键词：Nitraria tangutorum nebkha;Dry sand layer;Soil moisture dynamics;Small rainfall events

分类号：S812.2

摘要：干沙层对抑制蒸发、保护沙漠地区的生态水具有重要作用。以乌兰布和沙漠东缘白刺灌丛沙堆不同部位的干沙层为研究对象,采用烘干称重法对降雨前后灌丛沙堆不同部位干沙层土壤水分进行连续测定,结果表明:(1)从土壤水分空间变异来看,0~10cm干沙层土壤水分变化受降雨影响最为明显,4.3mm降雨能影响到0~5cm干沙层土壤水分,5.4mm和10.8mm降雨能影响到0~15cm干沙层土壤水分;(2)从土壤水分时间动态来看,与降雨前相比,降雨后干沙层土壤水分呈迅速增加-逐渐降低的变化趋势,在降雨后第1d增加最为明显,然后从降雨后第2d开始逐渐下降;(3)位于沙丘不同部位的干沙层土壤水分对降雨的响应存在显著差异,降雨后干沙层厚度变化速率表现为:阳坡中部>阳坡底部>阴坡底部>阴坡中部>坡顶。小降雨对白刺灌丛沙堆干沙层的消失和产生有重要影响,干沙层的形成是水分下渗和地表蒸发共同作用的结果。
Dry sand layer plays an important role in inhibiting evaporation and protecting ecological water in desert areas.In this study,we took the dry sand layers in different slope positions of Nitraria tangutorum nebkha on the eastern edge of the Ulanbuh desert as the research object,and used dry-weighing method to continuously measure the soil moisture of the dry sand layers in different slope positions before and after rainfall.The results show that:1)From the perspective of spatial variation of soil moisture,the change of soil moisture in the 0~10cm dry sand layer was most obviously affected by small rainfall,4.3mm rainfall can affect the soil moisture in 0~5cm dry sand layer,5.4mm and 10.8mm rainfall can affect the soil moisture in 0~15cm dry sand layer.2)From the perspective of the time dynamics of soil moisture,compared with that before rainfall,the soil moisture in the dry sand layer showed a rapid increase-gradual decrease trend after rainfall,and the most significant change occurred within 3 days after rainfall,especially in 0~5cm soil layer.3)There were significant differences in the response of the soil moisture in the dry sand layer located in different slope positions to rainfall.The change rate of dry sand layer thickness after rainfall was shown as:the middle of sunny slope>the bottom of sunny slope>the bottom of shady slope>the middle of shady slope>the top of slope.Small rainfall had an important impact on the disappearance and formation of the dry sand layer in Nitraria tangutorum nebkha.The formation of dry sand layer was the result of the combined action of water infiltration and surface evaporation.