摘要
以武夷山自然保护区为研究区域,用海拔、坡度、坡向和NDVI作为地形和植被景观变量,研究了地形-植被关系的尺度依赖性问题;利用小波分析工具,分别构建地形、植被因子在不同尺度上的小波方差图,然后利用小波系数计算NDVI和地形因子相关性。结果表明:武夷山自然保护区内NDVI及其地形因子均存在至少2个清晰的尺度结构,并且均是较大尺度上的小波方差更大,地形-植被二者存在的较小尺度区间比较一致,而较大的尺度区间略有差异;地形因子在中高尺度上与NDVI的相关性更强,反映了地形因子作为大的宏观制约因素对NDVI起作用;坡度和坡向与NDVI的相关性随尺度变化规律复杂并且波动性非常大。本研究有助于揭示自然保护区境内地形-植被多尺度复杂相关关系,同时也表明小波分析为揭示自然要素的多尺度空间结构提供了强有力的工具。
With the altitude, slope, aspect, and Normalized Difference Vegetation Index （NDVI ） as the landscape variables of topography and vegetation, this paper studied the scale dependency of topography-vegetation relations in Wuyi Mountain Nature Reserve. Different scale variograms of topographic factors and NDVI were established by wavelet transform, and the correlations between the topographic factors and NDVI were analyzed by using wavelet coefficients. In the study area, there existed at least two distinct scale patterns of topographical factors and NDVI. The nearly synchronous in scale domain, especially in small scale domain, suggested that there was a tightly-coupled relationship between topographic factors and NDVI. The topogTaphyvegetation relations were scale-dependent, and the correlation coefficients of NDVI and topographical factors were larger in larger scales than in smaller scales, suggesting that topographical factors played important roles in controlling NDVI patterns in larger scales. The relationships of NDVI with slope and aspect showed a large and complicated variation with spatial scale. This study could help to the understanding on the muhi-scale complicated correlations between topography and vegetation in the Reserve, and indicated that wavelet transform was useful in exploring the multi-scale spatial pattern of natural resources.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第9期1915-1920,共6页
Chinese Journal of Ecology
基金
中匈政府间国际科技合作项目
福建省科技计划重点项目(2009Y0032,2007I0016)
福建省自然科学基金资助项目(D0710011)
关键词
武夷山自然保护区
多尺度空间分析
NDVI
DEM
Wuyi Mountain Nature Reserve
multi-scale spatial analysis
NDVI
topographic factor.
