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《Acta Ecologica Sinica》 2004-03
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Analysis on the environmental and spatial factors for plant community distribution in the arid valley in the upper reach of Minjiang River

ZHANG Wen-Hui~1, LU Tao~1, MA Ke-Ming~2,ZHOU Jian-Yun~1,Liu Shi-Liang~2, (1.Northwest Sci-tech University of Agriculture and Forestry, Yangling 712100; 2.Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085,China).  
Minjiang river is an important branch of upper reach of the Yangtze River. The upper reach of Mingjiang river lies in the east margin of Qing-zang altiplano, a typical arid valley because of the special alpine canyon physiognomy, where the ecological security and the environment conservation is important for all of the Yangtze River valley. In this arid valley the mean annual precipitation is 493mm, the mean evaporation is 1332mm and the altitude 1300~2200m. The main plant communities are composed of xerophil plants. As the altitude increases, the special plant community's spatial pattern, with corresponding soil environmental factors, is formed. The paper aims to explain the influence of soil factors on the species quantitative pattern in communities and give the reference for vegetation recovery, after the analysis on the relation between the environmental factors and the plant community spatial pattern along with the spatial variation in the arid valley. Based on the investigation of 53 plots in the arid valley, the parameters of soil (soil water, pH, soil organic matter, total N, available N, total K, available K, Total P, and available P), the parameters of plant communities (the coverage, number, height for different plant species, etc.) and the spatial parameters (longitude, latitude, etc.) were analyzed. The ordination based on the community plots and the quantitative classification is performed with the TWINSPAN (Two Way Indicator Species Analysis) method. The species quantitative pattern of shrub and herb layers of communities were analyzed with detrended canonical correspondence analysis (DCCA) ordination, and the influence of soil factors, spatial factors and their interaction with the total variance of plant species abundance pattern were quantitatively partitioned. The results showed, that the shrub layer of communities could be divided into 5 types and the herb layer could be divided into 7 types. The soil water as the most principal factor with other environmental factors plays important role in forming the distribution pattern of communities. However, the environmental factors in different layers of communities were different. In shrub layer, the contribution rate of the soil environmental factors was 28.02% solely; the contribution rate of the soil environment factors with spatial factors coupling function was 8.90%; the spatial factors was 10.69% solely and other undetermined factors constituted 52.39% for explaining the community distribution pattern forming. Whereas in herb layer, the contribution rates of the four aspects above-mentioned were 20.64%, 0.83%, 5.10% and 73.43% respectively. The other undetermined factors might be the biological factors and random factors. It is clear that the undetermined factor in the herb layer is much higher than in the shrub layer. Therefore, that the herb layer was influenced by environmental factors should be less than that in the shrub layer. Whether in the shrub layer or in the herb layer, among the many environmental factors, the soil water always plays the most important role in the forming of community distribution pattern or species abundance variation in the communities.
【Fund】: 国家重点基础研究资助项目( G2 0 0 0 0 4 6 80 7);; 中国科学院知识创新资助项目 ( KZCX1 - 0 6 - 2 )~~
【CateGory Index】: Q948
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