綠洲-荒漠交錯帶活化沙丘的植物群落特征分析

摘要： 以民勤綠洲-荒漠交錯帶活化沙丘上的植物群落為對象,研究了活化沙丘不同部位的沙地植物群落物種組成、結(jié)構(gòu)和多樣性的變化.研究結(jié)果表明:從活化沙丘的下部、中部、丘頂,到背風(fēng)坡的中部、下部,再到丘間低地,每一個生境對應(yīng)著不同的群落類型.各部位不僅植物種類和數(shù)量存在差異,而且群落結(jié)構(gòu)差異明顯,其中丘頂為一年生草本植被構(gòu)成,而丘間低地處只有灌木.群落物種多樣性與相似性指數(shù)表明,從沙丘下部到丘頂再到丘間地,生態(tài)因子的差異對物種的分布格局產(chǎn)生了影響,從而導(dǎo)致了群落結(jié)構(gòu)和功能發(fā)生了變化.活化沙丘植被簡單,退化嚴(yán)重,需加強(qiáng)保護(hù),防止繼續(xù)退化. Abstract： The vegetation communities of activating dune in the Minqin oasis-desert ecotone were investigated by a conventional way for researching the plant species structures and characteristics in different position of the dune. The results showed that there is a different plant community type in each position of the activating dune from low,midst,dune tops and midst, low of slope depressions and sandy land among the dunes. The differences of plant species and quantity had exist, also the variance of plant communities obviously. There is only annual grass species on dune tops, but shrubs on sandy land. The bio-diversity and the similarity index of communities showed that the differenee of ecological factors not only affected the distribution patterns of species, but also changed the structures and functions of plant communities. The vegetations of these activating sanddunes are simple and suffer degeneration serious, then need enhanced protection methods to prevent sand dunes from becoming mobile. 作 者： 孫濤    王繼和    劉虎俊    紀(jì)永福    丁峰    袁洪波    SUN Tao    WANG Ji-he    LIU Hu-jun    JI Yong-fu    DING Feng    YUAN Hong-bo   作者單位： 甘肅省治沙研究所,甘肅省荒漠化防治重點(diǎn)實(shí)驗(yàn)室,甘肅,武威,733000  期 刊： 水土保持研究  ISTICPKU   Journal： RESEARCH OF SOIL AND WATER CONSERVATION  年，卷(期)： 2009, 16(6)  分類號： X171.1  關(guān)鍵詞： 綠洲-荒漠交錯帶    活化沙丘    植物群落    生物多樣性    Keywords： oasis-desert ecotone    activating sanddunes    vegetation community    biodiversity   

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