黄土丘陵区退耕地景观植被与土壤特征时空变异及其相关分析

对黄土丘陵区退耕地景观不同尺度的植被特征中的物种丰富度、物种多样性、物种均匀度,土壤特征中的有机质、全N和全P含量的相关关系和时空格局进行了研究。结果表明:区域尺度退耕地的植被指数小于流域尺度,但具有更大的变异性。两种尺度上物种丰富度与物种均匀度之间、物种多样性与物种均匀度之间均存在接近显著或具有显著的正相关关系,有机质含量与全N含量之间存在着极显著的正相关关系。区域尺度和流域尺度退耕地的植被特征与土壤养分含量具有不同的时空格局,但并没有显著的相关关系。说明黄土丘陵区退耕地植被特征和土壤养分含量可能受控于别的环境因素或干扰过程,导致了其植被特征与土壤养分特征的时空差异性。

Spatio-Temporal Variance and Correlation of Vegetation Characteristics and Soil Properties of Cropland to Forest in the Loess Hilly Region

Vegetation and soil is the two most active factors of landscape and the important content of evaluation for cropland to forest. The relationship between them is central to ecological research. In the loess hilly region, study of relationship is required for understanding of landscape ecological processes and restoration of cropland to forest. Spatio-temporal variance and correlation of (vegetation) species richness, diversity, evenness, soil organic matter, total nitrogen, total phosphorus of cropland to forest and their interaction at different spatial scales and habitats in the loess hilly region are analyzed in this paper. The vegetation index of cropland to forest in area scale is less than that in catchment scale, but it has more variance. To come near significant and significant positive correlations between species richness and evenness, species diversity and evenness, soil organic matter and total nitrogen were revealed at two scales and habitats studied. Different spatio-temporal patterns of vegetation characteristics and soil properties of cropland to forest were found, but no significant correlations between were observed in two scales. These results indicated vegetation characteristics and soil properties of cropland to forest were controlled by others environmental factors or interferential process. These factors or interferential process resulted in spatio-temporal variance vegetation characteristics and soil properties of cropland to forest.