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首页> 外文期刊>International Journal of Environmental Research and Public Health >Landscape Grain Effect in Yancheng Coastal Wetland and Its Response to Landscape Changes
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Landscape Grain Effect in Yancheng Coastal Wetland and Its Response to Landscape Changes

机译：盐城沿海湿地景观粒度效应及其对景观变化的响应

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The landscape grain effect reflects the spatial heterogeneity of a landscape and it is used as a research core of landscape ecology. The landscape grain effect can be used to not only explore spatiotemporal variation characteristics of a landscape pattern, but also to disclose variation laws of ecological structures and functions of landscapes. In this study, the sensitivity of landscape pattern indexes to grain sizes 50–1000 m was studied based on landscape data in Yancheng Coastal Wetland acquired in 1991, 2000, 2008, and 2017. Response of the grain effect to landscape changes was analyzed and an optimal grain size for analysis in the study area was determined. Results indicated that: (1) among 27 indexes (12 in a class level and 15 in a landscape level), eight indexes were highly sensitive to grains, ten indexes presented moderate sensitivity, eight indexes presented low sensitivity, and one was unresponsive. It was shown that the area-margin index and the shape index were more sensitive to the different grain sizes. The aggregation index had some differences in the grain size change, and the diversity index had a low response degree to the grain size. (2) Landscape indexes showed six different responses to different grains, including slow reduced response, fast reduced and then slow reduced response, monotonically increased response, fluctuating reduced response, up-down responses, and stable response, which indicated that the landscape index was closely related to the spatial grain. (3) From 1991 to 2017, variation curves of the landscape grain size of different landscape types could be divided into four types: fluctuation rising type, fluctuation type, monotonous decreasing type, and monotonous rising type. Different grain size curves had different interpretations of landscape changes, but in general, Yancheng Coastal Wetland’s landscape tended to be fragmented and complicated, internal connectivity was weakened, and dominant landscape area was reduced. Natural wetlands were more sensitive to grain size effects than artificial wetlands. (4) The landscape index at the 50 m grain size had a strong response to different grain size changes, and the loss of landscape information was the smallest. Therefore, it was determined that the optimal landscape grain size in the study area was 50 m.
机译：景观颗粒效应反映了景观的空间异质性，被用作景观生态学的研究核心。景观颗粒效应不仅可以用来探索景观格局的时空变化特征，而且可以揭示景观生态结构和功能的变化规律。本研究基于1991、2000、2008和2017年盐城沿海湿地的景观数据，研究了景观格局指数对50-1000 m粒度的敏感性。确定了研究区域中用于分析的最佳晶粒尺寸。结果表明：（1）在27个指标中（一个级别的12个和一个景观级别的15个），其中8个对谷物高度敏感，10个具有中等敏感度，8个具有低敏感度，1个没有响应。结果表明，面积裕度指数和形状指数对不同的晶粒尺寸更为敏感。聚集指数在晶粒尺寸变化中具有一些差异，而多样性指数对晶粒尺寸的响应度低。 （2）景观指数显示出对不同谷物的6种不同响应，包括缓慢降低响应，快速降低然后缓慢降低响应，单调增加响应，波动减少响应，上下响应和稳定响应，这表明景观指数为与空间纹理密切相关。 （3）从1991年至2017年，不同景观类型的景观粒度变化曲线可分为波动上升型，波动型，单调下降型和单调上升型四种。不同的粒度曲线对景观变化有不同的解释，但总的来说，盐城沿海湿地的景观趋于破碎和复杂，内部连通性减弱，优势景观面积减小。天然湿地比人工湿地对粒度影响更为敏感。 （4）50 m粒径景观指数对不同粒径变化有较强的响应，景观信息的损失最小。因此，确定研究区域的最佳景观粒度为50 m。

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