在生态环境方面草原植被破坏严重, 草原沙化,草场退化, 土地盐碱化.In the aspect of environment destroy the plant, sandy grassland, saline soil.长江源区存在不同程度的沙化现象,沙地种类多样,分布广泛.Desertification of various degrees have been happening source region of Yangtze R...
细胞壁上有不规则的增厚, 增厚的部分通常在几个细胞 邻接处 的角隅上特别明显.The cell walls are irregularly thickened and pectin , the thickening giving distinct the cells in cross - section....