关键词: 茶梅, 叶片, 组织结构, 气孔

Abstract: Based on the data of land use and hydrochemistry of river water in the Binggou River Basin in September 2016, buffers at three scales were established by the center of the water sampling points. The landscape index was calculated by Fragstats 4.2. The relationship between landscape pattern and hydrochemistry at different scales was analyzed by redundant analysis method. The results showed that different land use/cover types had different effects on chemical characteristics of river water. Increased area of farmland and construction land promoted the major chemical elements to be converged into river water. Grassland retained water chemical elements, whereas water area and desert had dilution effects. Forest land was positively related to water chemical characteristics in the upper reaches. Patch density, landscape division index, and patch cohesion index were good indicators for water chemistry at the scale of 200 m and 600 m in the Binggou River Basin. The relationships of the areaweighted patch fractal dimension at 1000 m buffer scale and the landscape shape index at 600 m scale with the water chemistry characteristics accorded with the objective law. The Shannon’s diversity index at the 600 m buffer scale in the middle and lower reaches of this basin could better indicate water chemistry characteristics. Our results revealed the ecological hydrological processes in the Qilian Mountains and thus provide reference for the rational use of land and the optimization of landscape pattern.

Key words: Camellia sasanqua, leaf, tissue structure, stomatal.