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[1]ZHANG He-quan.Species Diversity of Plant Community in the Origin Area of the Minjiang River， Southwestern China[J].Research of Soil and Water Conservation,2013,20(05):135-140.

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Species Diversity of Plant Community in the Origin Area of the Minjiang River， Southwestern China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 05 Page number: 135-140 Column: Public date: 2013-10-28

Title:: Species Diversity of Plant Community in the Origin Area of the Minjiang River， Southwestern China

Author(s):: ZHANG He-quan; Qinghai Engineering Consulting Center, Xi’ning 810001, China

Keywords:: origin area of the Minjiang river; plant community; species diversity; environmental factors; canonical correlation analysis

CLC:: Q948.15

DOI:: -

Abstract:: Species diversity of plant community is one of the major components of ecosystem functions. It was influenced by many environmental factors, such as soil and topographic characteristics. Conversely, plant community diversity patterns also influence the soil characteristics. The upper reaches of the Minjiang River is located in the transition zone between the Qinghai-Tibet Plateau and the Sichuan Basin. It has a typical arid valley climate with complex topography and variable water and heat conditions. Based on the field investigation of plant species and environmental factors (altitude, microtopography, soil water content, and soil nutrients) in the origin area of Minjiang River, Sichuan Province, southwestern China, plant community diversity and its relationship with environmental factors were studied. The diversity in different vegetation types varied as follows: forest formations>shrub formations>meadow formations. The diversity in herb layer of form Salix spp., form Sibiraea angustata, form Spiraea spp.and form Caragana spp.are at high level, while form Hippophae rhamnoides and form Berberis amurensis are at lower level. In meadow formations, the diversity of form Imperata cylindrica and form Carex spp.are higher than that of form Sub-alpine and form Kobresia spp. As for shrub layer, form Caragana spp. has the highest diversity, form Hippophae rhamnoides has the lowest diversity. Diversity in herb layer is higher than that of shrub layer. Under a great influence of altitude gradient, species compositions in plant communities in the origin area of Minjiang River show significant differences. With an increase of altitude, diversity of both the herb layer and shrub layer displays symmetrical changing trends that they are almost the same at altitude ranges of 2 700~3 300 m and 3 300~3 900 m. The higher diversity can be observed at altitude ranges of 2 900~3 100 m and 3 500~3 700 m, while a lower one can be observed at altitude ranges of 2 700~2 900 m, 3 100~3 400, 3 700~3 900 m. The maximum diversity of shrub layer and herb layer occurs at the altitudes of 3 000 m and 3 600 m, respectively. Canonical correlation analysis among vegetation, soil and topography factors shows that significant correlation exists between each pair of the variables. Altitude and slope aspect have great influences on total N, soil water content, soil pH, species diversity in the shrub layer, shrub and herb layer coverage, while species diversity and coverage of shrub and herb layer coverage is closely related to the total nitrogen, available K and soil water content.

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