摘要
选择农业种植(玉米)和造林(竹柳)两种不同土地利用方式,探讨其对三峡库区消落带植被组成和多样性的影响。结果表明:(1)造林地消落带植被的物种数量、平均高度和生物量显著高于农业种植;(2)造林地消落带优势种依次为狼杷草、空心莲子草和苍耳,而农业种植优势种依次为马唐、雾水葛和叶下珠;(3)Simpson指数、Shannon-Wiener指数和Pielou指数在造林地和农业种植之间并没有显著差异,但造林地Patrick指数明显高于农业种植。不同土地利用方式显著地影响着消落带植被群落基本特征及多样性,差异主要与农业种植的人工干扰(除草)和造林对消落带微生境(光照、温湿度等)改变有关。相对传统农业种植,人工造林地消落带有着较高的物种数量和生物多样性。
Agriculture （Corn） and afforestation （Willow bamboo） were selected to explore effects of different types of land use on vegetation composition and diversity of riparian zone in the Three Gorges Reservoir area. Results show that： first, the number of species, mean height and biomass of vegetation in afforestation sites were significantly higher than those of Agriculture sites; second, plant community was dominated by Bidens tripartite, Alternanthera philoxeroides and Xanthium sibircum in afforestation sites, while Digitaria sanguinalis, Pouzolzia zeylanica and Phyllanthus urinaria were dominant species in agriculture sites; third, no significant differences in Simpson index, Shannon-Wiener index and Pielou index were found between the two types of land use, but Patrick index in afforestation sites was obviously higher than that in agriculture sites. Different ways of land use significantly affect the basic characteristics of the vegetation community and diversity, which was attributed to artificial interference （weed control） in agricultural activities and the change of micro habitat （light, temperature and humidity, etc. ） by afforestation. Compared with agriculture, artificial afforestation was a good way to improve the plant diversity of riparian zone.
出处
《环境影响评价》
2015年第4期68-71,共4页
Environmental Impact Assessment
基金
国家水体污染控制与治理科技重大专项(2012ZX07104-003)
重庆市自然科学基金项目(cstc2012jj A00008
cstc2012jj B20003)
关键词
土地利用
消落带
植被群落
多样性
三峡库区
land use
riparian zone
plant vegetation
diversity
Three Gorges Reservoir Area
