基于典范对应分析的滨海滩涂围垦区景观格局与土壤盐渍化关系

发布时间：2018-10-05 19:34

【摘要】：以江苏中部如东滩涂围垦区为研究区,利用典范对应分析探讨不同空间尺度景观格局对土壤盐渍化程度的影响和贡献度。结果表明:(1)研究区斑块密度、边缘密度、景观形状指数、聚集度指数、散布与并列指数较高,说明景观破碎化程度较高,景观结构复杂,景观分布受人为干扰的程度较大。(2)土壤中Na+和Cl-分别占阳离子总量和阴离子总量的87.4%和90.1%,土壤盐渍化指标的变异系数为53.49%~129.03%,反映了土壤盐分的非均匀分布。(3)研究区景观格局指数在100 m和200 m缓冲区尺度分别能累积解释土壤盐渍化程度变化的66.6%和80.1%,土壤盐渍化程度与农建地和水浇地面积比例呈正相关关系,与旱地面积比例呈负相关关系。(4)景观水平上的土壤盐渍化程度与最大斑块指数、蔓延度指数呈正相关关系,与斑块密度、边缘密度、景观形状指数、香农多样性指数呈负相关关系;斑块类型水平上,最大斑块面积指数、边缘密度、景观形状指数是影响研究区土壤盐渍化程度的共性指标。研究对于优化滩涂围垦区土地利用格局,降低土壤盐渍化程度具有重要意义。
[Abstract]:The typical correspondence analysis was used to study the effect and contribution of landscape pattern of different spatial scales on soil salinization in the coastal reclamation area of Rudong in the middle of Jiangsu Province. The results showed that: (1) the patch density, edge density, landscape shape index, aggregation index, dispersion and juxtaposition index were higher in the study area, which indicated that the landscape fragmentation was higher and the landscape structure was complex. (2) Na and Cl- accounted for 87.4% and 90.1% of total cations and anions, respectively. The coefficient of variation of soil salinization index was 53.49 and 129.03, which reflected the non-uniform distribution of soil salt. The landscape pattern index can accumulate 66.6% and 80.1% of the variation of soil salinization at the scale of 100m and 200m buffer zone, respectively. The soil salinization degree has a positive correlation with the proportion of agricultural land and irrigated land area. (4) soil salinization at landscape level was positively correlated with the maximum patch index and spread index, and positively correlated with patch density, edge density and landscape shape index. Shannon diversity index was negatively correlated with patch type level, the maximum patch area index, edge density and landscape shape index were the common indexes affecting soil salinization in the study area. The study is of great significance for optimizing the land use pattern and reducing the soil salinization in the reclamation area.
【作者单位】：南京大学地理与海洋科学学院;国土资源部海岸带开发与保护重点实验室;
【基金】：国家自然科学基金重点项目(41230751) 国土资源部公益性行业科研专项(201511086)
【分类号】：S156.41;P901

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