鄱阳湖典型洲滩湿地土壤质地与水分特征参数研究

发布时间：2018-06-09 20:46

本文选题：土壤质地 + van　；参考：《长江流域资源与环境》2016年08期

【摘要】：频繁干湿交替增强了鄱阳湖洲滩土壤水对湿地系统的动态调节作用。以鄱阳湖吴城国家自然保护区的一个典型洲滩湿地为研究区,调查分析了土壤质地沿高程梯度的分布特征,确定了不同土壤质地的水分特征参数,并阐述了土壤质地与其水分特征参数的空间异质性。结果发现:该洲滩湿地主要分布砂土、粉壤土和粘土三种类型。水平断面方向上,粒径较粗的砂土和粉壤土主要分布在高位滩地,而粒径相对较细的粘土主要分布在近湖区开阔水面的低位滩地;土壤剖面方向上,土壤质地呈现出固有分层特性。van Genuchten模型应用于鄱阳湖洲滩湿地土壤水分特征曲线拟合,证实了该模型在鄱阳湖洲滩湿地的适用性。模型结果表明土壤残余含水率θr变化约9%~19%,饱和含水率θs变化约42%~57%,土壤进气值的倒数α约0.01 cm~( 1),水分特征曲线形状参数n介于1.11~4.65之间。土壤含水率变化对van Genuchten模型中参数α和n较为敏感,而对θr和θs的敏感性相对较弱。研究成果可为后续该区域以及全湖区湿地生态水文模型的构建和发展提供背景信息和参数资料。
[Abstract]:Frequent dry and wet alternation enhanced the dynamic regulation effect of soil water on wetland system in Poyang Lake. Taking a typical beach wetland in Wucheng National Nature Reserve of Poyang Lake as the research area, the distribution characteristics of soil texture along the elevation gradient were investigated and analyzed, and the water characteristic parameters of different soil textures were determined. The spatial heterogeneity of soil texture and its water characteristic parameters was also discussed. The results show that there are three types of sandy soil silty loam and clay in the wetland. In the horizontal section direction, the coarse sand and silty loam are mainly distributed in the highstand beach, while the relatively fine clay is mainly distributed in the low beach near the open water surface of the lake area, and in the soil profile direction, The soil texture showed inherent stratification. Van Genuchten model was applied to fitting the soil moisture characteristic curve of Poyang Lake beach wetland, which confirmed the applicability of the model in Poyang Lake beach wetland. The model results showed that the residual water content 胃 _ r was about 9 / 19, the saturated water content 胃 _ s was about 42 / 57, the reciprocal 伪 of the soil air intake value was about 0.01 cm ~ (-1), and the shape parameter of the water characteristic curve was between 1.114.65 and 1.114.65. The variation of soil moisture content was sensitive to the parameters 伪 and n in van Genuchten model, but the sensitivity to 胃 r and 胃 s was relatively weak. The research results can provide background information and parameter data for the construction and development of eco-hydrological model of wetland in this region and the whole lake area.
【作者单位】：中国科学院南京地理与湖泊研究所流域地理学重点实验室;河海大学水文水资源与水利工程科学国家重点实验室;华北水利水电大学;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室;
【基金】：国家重点基础研究发展计划(2012CB417003) 国家自然科学基金项目(41401031) 河海大学水文水资源与水利工程科学国家重点实验室开放研究基金(2014491611) 江西省重大生态安全问题监控协同创新中心项目(JXS-EW-00)~~
【分类号】：S151.9

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