摘要
C4植物水分利用效率高于C3植物,CAM植物具有最高的水分利用效率。在我国荒漠地区,CAM植物稀少,C4植物,特别是C4木本植物在荒漠生态系统中具有重要地位和作用。我国荒漠地区有C4木本植物45种,包括半木本植物,占我国荒漠植物总种数的6%,集中在藜科和蓼科,分别为19种和26种。C4草本植物共计107种,其中单子叶植物48种,双子叶植物59种。C4木本植物主要分布在贺兰山以西的西北干旱荒漠区。C4草本植物的耐旱性和抗旱能力不如C4木本植物,主要分布在荒漠地区潜水埋深较浅,水分条件较好的区域,在绿洲边缘广泛分布。C4木本植物丰度与干旱紧密相关,C4草本植物丰度随湿润条件而增加。
Water use efficiency of C4 plants is higher than that of C3 plants,and CAM（Crassulaceae acid metabolism） plants have the highest water use efficiency.In the desert regions of China,CAM plants are scarce,and C4 plants,especially C4 woody plants,have an important position and role in the desert ecosystem.There are 45 species of C4 woody plants in the desert regions of China,including semi-woody plants,which account for 6% of total desert plant species in China,and most of them concentrate in the families of Chenopodiaceae and Polygonaceae,which are 19 species and 26 species,respectively.The numbers of C4 herbaceous plants are 107 species,including 48 species of monocotyledon and 59 species of dicotyledons.C4 woody plants mainly inhabit in the northwestern arid desert region of China to the west of the Helan Mountains.The drought-resistance and drought-tolerance in C4 herbaceous plants are worse than C4 woody plants,and the C4 herbaceous plants mainly inhabit in the areas with shallow groundwater and better water conditions in desert regions,and widely distribute in the edge of oasis.The abundance of C4 woody plants is closely correlated with drought,but the abundance of C4 herbaceous plants increases with wet conditions.
出处
《中国沙漠》
CSCD
北大核心
2011年第2期267-276,共10页
Journal of Desert Research
基金
国家自然科学基金项目(3107035991025026)资助
关键词
荒漠植物
C4光合作用
木本植物
地理分布
desert plant
C4 photosynthesis
woody plant
geographical distribution
