Analysis of Relation between Change of Lakes and the Spatial Pattern of Soils in the Lake District in Sihu Drainage Basin,Middle Reaches of Yangtze River
Analysis of Relation between Change of Lakes and the Spatial Pattern of Soils in the Lake District in Sihu Drainage Basin,Middle Reaches of Yangtze River
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发表时间：
2012
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通讯作者：
Xiao Fei
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作者：
Xiao Fei
为分析长江中游四湖流域湖泊变化幅度与湖区土壤空间格局的关系，利用历史地形图、湖泊图、水资源图和遥感影像，收集了20世纪20年代至2005年四湖流域湖泊分布信息，分析了四湖流域土壤空间格局与湖泊变化的关系。将湖泊图的时间序列导入GIS软件中，根据所收集的数据，按年代划分成若干阶段，然后利用叠置分析方法检测和检验湖泊在不同时间段的空间变化与土壤类型空间格局之间的关系，从湖泊变化的空间分析入手，结果表明，研究区湖泊经历了扩张-萎缩-稳定的演变过程，20世纪20 ~ 40年代为湖泊扩张阶段，之后湖泊不断萎缩，50年代中期~ 60年代，湖泊面积在20世纪70年代末以后趋于稳定，2000年以后基本保持不变。叠加分析结果表明，湖泊波动区土壤类型的空间格局与20世纪20 - 70年代湖泊变化过程具有一定的相关性。整个湖泊消落区的潜育性水稻土和沼泽性水稻土占整个四湖流域的67%以上，在20世纪40年代以来的湖泊萎缩期，潜育性水稻土和沼泽性水稻土在湖泊消落区的比例随着湖泊的变化而增加，淹水水稻土和水成水稻土所占比例随湖泊演变时间的延长而沿着降低，在与湖泊演变阶段相对应的不同空间范围内，水稻土比例与湖泊变化时期的相关性在一定程度上反映了土壤改良利用的影响，根据沼泽化水稻土转化率的空间差异，推测地形对沼泽化过程有明显的影响.
The purpose of this study is to analyze whether the spatial pattern of soils in the lake district has some relationships with the course of change of lakes at the lakes’fluctuation extent in Sihu drainage basin, middle reaches of Yangtze River.Information of lakes’distribution in Sihu drainage basin from 1920s to 2005 was collected from historical topographic maps,lake maps,water resources maps,and remotely sensed images.Afterwards,the time series of lake maps were imported into GIS software and characterized into several stages by decade according to the collected data.Then,overlay analysis were used to detect and test the relationships between the spatial changes of the lakes among different time intervals and the spatial patterns of the soil types.From the spatial analysis of the lakes changes,it turned out that the lakes in the study area changed from spread to shrink and to stabilization.The period from 1920s to 1940s is the lake spread stage.After this stage,lakes in the study area shrunk continuously.Between the middle of 1950s and 1960s,shrink speed of the lakes reached its maximum level.Area of the lakes was steadying after the end of the 1970s,and remained basically unchanged after 2000.The results of overlay analysis showed that the current spatial pattern of soil types was correlative with the course of lakes changes from 1920s to 1970s at the lakes’fluctuation regions. The whole lakes’fluctuation regions concentrated more than 67%gleyed paddy soil and swamp paddy soil of all the Sihu drainage basin.During the lakes’shrunk period since 1940s,the percentage of the gleyed paddy soil and swamp paddy soil in the lake fluctuation regions increased following the time of the lakes’changes, whereas the percentage of submergic paddy soil and hydromorphic paddy soil decreased along with the time of the lakes changes.At the different spatial ranges corresponding with the stages of lakes’changes,the relevance between the proportion of paddy soils and the periods of lake changes reflected the influence of the soil amelioration and utilization to some extent.It also could presume that the topography has distinct effects to the deswamping process according to the spatial differences of the transformation rate of the swamp paddy soil.