摘要
为了分析变化条件下洲滩内部土壤水分时空变化特征及不同深度土壤水分含量和湖水位的相关性,以洞庭湖典型洲滩断面为研究对象,利用原位监测装置连续2个月监测了湖水位、大气温度及土壤水分含量的动态变化过程。结果表明:洞庭湖洲滩水分场的分布在垂向上呈现明显的分层现象,同一位置的土壤水分含量的波动幅度随着深度的增加而逐渐减小,至深层处(大于50 cm)趋于稳定,同一深度的土壤水分含量的波动幅度随着与岸边距离的增加而逐渐减小。土壤水分含量与湖水位之间的相关性随着深度的增加呈先增强后减弱的趋势,浅层及深层的土壤水分含量和湖水位之间均呈无显著相关性,地表以下50~70 cm深度处土壤水分含量与湖水位相关性较高。研究结果有助于了解土壤水分在洲滩生态系统地下含水层-土壤-大气界面的相互作用机制,为洲滩水文过程及生态环境保护研究提供重要方法和理论参考。
In order to study the temporal and spatial variation characteristics of soil moisture and the correlation between soil moisture content and lake water level in the beach wetlands under changing conditions,the typical continental wetland section of Dongting Lake was taken as the research object,and the water level,atmospheric temperature,and soil moisture content were monitored by in-situ monitoring device for two months.The results indicate that the distribution of moisture field in the wetland of Dongting Lake presents an obvious stratification phenomenon in the vertical direction.The fluctuation range of soil moisture content in the same location gradually decreased with the increase of depth,and became stable in the deep(>50 cm).The fluctuation range of soil moisture content at the same depth decreased with the increase of distance from the bank.The correlation between soil moisture content and lake water level increased first and then weakened with the increase of depth.There was no significant correlation between the soil moisture content of the shallow and deep layers and the lake water level.The soil moisture content at the depth of 50~70 cm below the surface was highly correlated with the lake water level.The results reveal the interaction mechanism of soil moisture in the underground aquifer-soil-atmosphere interface of the wetland ecosystem,and provide important methods and theoretical references for the study of hydrological processes and ecological environment protection in the wetlands.
作者
陈波
陈建湘
代娟
任杰
CHEN Bo;CHEN Jianxiang;DAI Juan;REN Jie(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi′an University of Technology,Xi′an 710048,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China;Middle Changjiang River Bureau of Hydrology and Water Resources Survey,Hydrology Bureau of Changjiang Water Resources Commission of the Ministry of Water Resources,Wuhan 430072,China;Changjiang River Scientific Research Institute,Changjiang Water Resources Commission of the Ministry of Water Resources,Wuhan 430012,China)
出处
《水资源与水工程学报》
CSCD
2020年第1期254-260,共7页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51679194、51509014)
陕西省水利厅科技计划项目(2019slkj-12)
水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金项目(2019490711)。
关键词
湖水位
土壤水分含量
时空变化特征
相关性分析
洲滩湿地
洞庭湖
lake water level
soil moisture content
spatiotemporal variation characteristics
correlation analysis
beach wetland
Dongting Lake