岷江源头区植被景观与流域土壤侵蚀的动态相关性
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摘要
作为复杂的生态过程之一，土壤侵蚀常常被空间景观异质性影响。深入地研究土壤侵蚀与植被景观的相关性对以减少水土流失为目的的河流中上游生态恢复工作来说十分重要。本文利用遥感和GIS技术，对岷江源头区的植被景观和土壤侵蚀动态(1974年～2002年)进行分析，并从景观生态学的角度，系统地研究了整体植被景观和不同的植被景观类型的景观特征与土壤侵蚀量、侵蚀模数以及土壤侵蚀强度的相关性，得出的结论主要有以下几个方面：
1．从植被景观特征与土壤侵蚀量和土壤侵蚀模数的相关性的角度出发，森林能最大限度地控制土壤侵蚀，草地对土壤侵蚀的控制能力不及森林，而且能在一定程度上增加土壤侵蚀。灌丛与土壤侵蚀量和土壤侵蚀模数的关系则比较复杂，还需要进一步地研究。农用地与森林、灌丛、草地等植被类型不同，它的增加将会明显地增加产沙量。随着各景观类型(灌丛除外)分布的镶嵌性的增强，土壤侵蚀量和侵蚀模数会减少。
2．从植被景观特征与土壤侵蚀强度的相关性的角度出发，在景观水平上，植被景观的景观多样性指数、景观破碎度指数、景观形状指数和景观聚集度指数均与土壤侵蚀强度有明显的相关性。在较轻侵蚀强度的区域中的植被景观具有更丰富的多样性和更低的破碎程度，景观的组分和结构都更加复杂，景观斑块的形状也比较复杂。同时，植被景观的空间异质性也较强。
3．从不同景观类型对土壤侵蚀强度的控制能力大小看：针叶林＞落叶阔叶林＞针阔混交林＞灌丛＞草地＞农用地。同时，对于除农用地以外的其他植被景观类型来说，增加其平均斑块面积和形状的复杂性会在一定程度上减少土壤侵蚀强度。而对于农用地来说，斑块形状的简单化以及分布形式的均匀镶嵌化则是减少土壤侵蚀强度的有效手段。
As a complex ecological process, soil erosion is affected by the spatial landscape heterogeneity.The relation between soil erosion and landscape characteristic weights a lot in ecosystemrestoration that aim to control the soil erosion in watershed. By means of RS and GIStechniques, this study analyzed dynamic variations in landscape characteristic and soil erosionin the Minjiang headwater region over a period of 28 years to elucidate the interrelationshipsbetween landscape characteristics and soil erosion. The results are as follows:
1. In terms of relation between landscape characteristics and soil erosion module, forest canmitigate the soil erosion much better than grass. The relation between shrub and soil erosionmodule is rather complicated that requests further more study to confirm how those two factorscorrelated with each other. Cultivated land differs from other landscape classes in creatingconditions most favorable for soil erosion. Moreover, the dispersion of all landscape classes,except for shrub, correlates with soil module negatively.
2. In terms of relation between landscape characteristics and soil erosion strength, the diversityindex, fragment index, shape index and contagion index of the vegetation in Minjiangheadwater region at landscape-level correlated with soil erosion clearly. Vegetation landscapein No and Slight erosion region is more diverse, fragmental and constructed in more complexway. The shape of those vegetation patches is also more complicated. The spatial heterogeneityof the vegetation landscape is much more evident than that located in moderate and strongerosion region too.
3. At class-level, different landscape classes affected soil erosion strength in different ways. Taking the mitigating effect on erosion strength into consideration, landscape classes can bearranged in this turn: coniferous forest＞Deciduous forest＞Mixed forest＞Shrub＞Grassland＞Cultivated land. At the same time, for most landscape classes, except for cultivated land,increase the mean patch size and complicate the shape of patch will help to relieve the erosionstrength. However, for cultivated land, simplifying the shape of patch and scattering thepatches have the same effect.
1．从植被景观特征与土壤侵蚀量和土壤侵蚀模数的相关性的角度出发，森林能最大限度地控制土壤侵蚀，草地对土壤侵蚀的控制能力不及森林，而且能在一定程度上增加土壤侵蚀。灌丛与土壤侵蚀量和土壤侵蚀模数的关系则比较复杂，还需要进一步地研究。农用地与森林、灌丛、草地等植被类型不同，它的增加将会明显地增加产沙量。随着各景观类型(灌丛除外)分布的镶嵌性的增强，土壤侵蚀量和侵蚀模数会减少。
2．从植被景观特征与土壤侵蚀强度的相关性的角度出发，在景观水平上，植被景观的景观多样性指数、景观破碎度指数、景观形状指数和景观聚集度指数均与土壤侵蚀强度有明显的相关性。在较轻侵蚀强度的区域中的植被景观具有更丰富的多样性和更低的破碎程度，景观的组分和结构都更加复杂，景观斑块的形状也比较复杂。同时，植被景观的空间异质性也较强。
3．从不同景观类型对土壤侵蚀强度的控制能力大小看：针叶林＞落叶阔叶林＞针阔混交林＞灌丛＞草地＞农用地。同时，对于除农用地以外的其他植被景观类型来说，增加其平均斑块面积和形状的复杂性会在一定程度上减少土壤侵蚀强度。而对于农用地来说，斑块形状的简单化以及分布形式的均匀镶嵌化则是减少土壤侵蚀强度的有效手段。
As a complex ecological process, soil erosion is affected by the spatial landscape heterogeneity.The relation between soil erosion and landscape characteristic weights a lot in ecosystemrestoration that aim to control the soil erosion in watershed. By means of RS and GIStechniques, this study analyzed dynamic variations in landscape characteristic and soil erosionin the Minjiang headwater region over a period of 28 years to elucidate the interrelationshipsbetween landscape characteristics and soil erosion. The results are as follows:
1. In terms of relation between landscape characteristics and soil erosion module, forest canmitigate the soil erosion much better than grass. The relation between shrub and soil erosionmodule is rather complicated that requests further more study to confirm how those two factorscorrelated with each other. Cultivated land differs from other landscape classes in creatingconditions most favorable for soil erosion. Moreover, the dispersion of all landscape classes,except for shrub, correlates with soil module negatively.
2. In terms of relation between landscape characteristics and soil erosion strength, the diversityindex, fragment index, shape index and contagion index of the vegetation in Minjiangheadwater region at landscape-level correlated with soil erosion clearly. Vegetation landscapein No and Slight erosion region is more diverse, fragmental and constructed in more complexway. The shape of those vegetation patches is also more complicated. The spatial heterogeneityof the vegetation landscape is much more evident than that located in moderate and strongerosion region too.
3. At class-level, different landscape classes affected soil erosion strength in different ways. Taking the mitigating effect on erosion strength into consideration, landscape classes can bearranged in this turn: coniferous forest＞Deciduous forest＞Mixed forest＞Shrub＞Grassland＞Cultivated land. At the same time, for most landscape classes, except for cultivated land,increase the mean patch size and complicate the shape of patch will help to relieve the erosionstrength. However, for cultivated land, simplifying the shape of patch and scattering thepatches have the same effect.
引文
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