Nine indices, such as elevation, topographical index, precipitation, temperature, soil, etc, were used to define the environmental characteristics of wetland habitats in Zoige Plateau. Based on ArcGIS 9.2 platform, scatter quadrats were randomly generated, sample-environmental factors matrix and sample-landscape structure matrix were obtained through spatial analysis module. And then, a DCCA was used to quantitatively analyze the roles of the environmental factors and their effects on the spatial distribution of wetland landscape. The results suggest that: 1) the first two DCCA axes explained 79.4% of the relationships between environmental influence and wetland distribution, suggesting that DCCA was an effective analysis technique at landscape scale. 2) There is no evident correlationship (-0.2117, 1st axis; 0.0348, 2nd axis) between precipitation and wetland distribution, meanwhile, various wetland landscapes changed obviously along the moisture gradient (0.8003, P<0.001, 1st axis), which was represented approximately by topographical index. Precipitation redistribution by topography and geomorphology was core process in formation of wetland landscape spatial distribution. 3) Elevation significantly correlated to slope, topographical index and annual average temperature, suggesting that not only the spatial differentiation of hydrothermal regime but also the water conservation ability in local area were deeply influenced by terrain. Terrain was the basic influence factor of wetland landscape in the study area. 4) The 2nd DCCA axis was mainly composed of soil type (0.6029, P<0.01) and the distance to road (-0.4322, P<0.05). These two factors had important impact on wetland landscape of Zoige Plateau. Above all, applying DCCA which is widely used in quantitative ecology areas for multivariate analysis is helpful to understand the relations between wetland distribution and environmental factors at landscape scale in Zoige Plateau. And topographical index is an effective indicator in delineating the moisture differentiation and wetland distribution.
YE Yu, LIU Gaohuan, HUANG Chong, NING Jicai, LI Yafei
. Analysis on Relationship between Wetland Landscape and Environmental Factors in Zoige Plateau Based on DCCA[J]. Journal of Geo-information Science, 2011
, 13(3)
: 313
-322
.
DOI: 10.3724/SP.J.1047.2011.00313
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