| 三江平原退化湿地土壤物理特征变化分析 |
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| 引用本文： | 王世岩.三江平原退化湿地土壤物理特征变化分析[J].水土保持学报,2004,18(3):167-170,174. |
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| 作者姓名： | 王世岩 |
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| 作者单位： | 中国水利水电科学研究院水环境研究所,北京,100038 |
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| 基金项目： | 国家自然科学基金资助项目(49771002) |
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| 摘 要： | 针对不同退化程度的湿地土壤物理特征的变化进行了分析。首先对退化湿地土壤剖面特征进行了阐述,然后分析了退化湿地土壤的温度特征变化、电导率状况变化、土壤的水分特征变化和土壤容重变化。研究表明,不同退化程度的湿地土壤具有不同的土壤物理性质,在未退化湿地→轻度退化湿地→中度退化湿地→重度退化湿地→已垦湿地(农田)的湿地退化研究样带上,湿地土壤温度呈现逐渐升高的变化趋势、土壤电导率呈降低变化、土壤水分呈降低趋势、土壤容重则呈现升高的变化规律。土壤表层与下层相比较,土壤表层温度、含水量与容重均高于土壤下层;在电导率的变化中,除了未退化湿地土壤的下层高于表层以外,其它退化状态的湿地土壤均为表层高于下层。另外,对退化湿地土壤的各物理特征在空间距离上的退化过程进行模型模拟,发现指数增加(或分解)模型能够较好地模拟出湿地土壤物理特征的空间退化过程。本研究将有助于理解退化湿地土壤物理特征的变化规律和查明湿地的退化机理,为退化湿地的恢复与重建研究奠定科学基础。
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| 关 键 词： | 湿地退化 退化湿地土壤 物理特征 三江平原 |
| 文章编号： | 1009-2242(2004)03-0167-04 |
Analysis on Change of Physical Characteristics of Degraded Wetland Soils in Sanjiang Plain |
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| WANG Shi-yan.Analysis on Change of Physical Characteristics of Degraded Wetland Soils in Sanjiang Plain[J].Journal of Soil and Water Conservation,2004,18(3):167-170,174. |
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| Authors: | WANG Shi-yan |
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| Abstract: | This paper analyzes the change regularity of soil physical characteristics of degraded wetlands. Firstly, the soil profiles of degraded wetlands are been described and then that the change of soil temperature characteristics, electric conductance status, water physical property and soil bulk density are all been analyzed. The research shows that wetland soils in different degraded status have their different physical characteristics. In the typical sampling zone of wetland degradation which means primitive wetland will transform to simple degraded wetland, and then to medium degraded wetland, and then to serious degraded wetland and to cultivated wetland (farmland), soil temperature and bulk density of wetlands increase continuously, and wetland soil electric conductance and soil bulk density trend to decrease. Compare soil surface layer (0~20 cm) and lower layer (20~40 cm), the surface temperature, water physical property and bulk density of wetland soils are all higher. In addition, this paper gives the simulation models of spatial degradation process of different physical characteristics of degraded wetland soils, which shows that exponential growth or decay models could preferably simulate spatial degradation process of different physical characteristics of degraded wetland soils. This study will be helpful to understand the change regularity of physical characteristics of degraded wetland soils and the mechanism of wetland degradation, and will establish scientific base for restoration and reconstruction of degraded wetland. |
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| Keywords: | wetland degradation degraded wetland soils physical characteristics the Sanjiang Plain |
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