作　　者： ; ; ; ;

机构地区： 九江学院生命科学学院

出　　处： 《华中农业大学学报》 2010年第3期300-305,共6页

摘　　要： 在四川省德昌县弃耕荒地紫茎泽兰入侵区,开展植物群落的结构、物种组成及其多样性调查,并与紫茎泽兰种群结构特征进行了比较。结果表明：紫茎泽兰轻度发生区植物群落多样性指数年际变化不大,介于0.550 1-0.683 3之间;中度发生区多样性指数年际变化最大,介于0.333 5-0.639 3之间;重度发生区已经形成紫茎泽兰单优群落;轻度发生区紫茎泽兰的生长扩散速度较慢,种群多为零星丛状分布,1 a后密度从3株/m^2增至8株/m^2,盖度从5%扩大到10%;中度发生区紫茎泽兰密度从32株/m^2增至次年的103株/m^2,盖度从35%扩散至90%以上;重度发生区域的紫茎泽兰的盖度、密度以及株高等均已达到最大,同期伴生植物极少。 Based on the mild,moderate and severe communities of Eupatorium adenophorum,the structure,species composition and diversity of the plant community in the abandoned arable land of Dechang county,Sichuan province was investigated comparing with the structure characteristics of Eupatorium adenophorum.The results showed that in mildly occurred sites,the internal diversity index of this plant community varied slightly from 0.550 1 to 0.683 3;in moderately occurred sites,that decreased from 0.639 3 to 0.333 5;in the severe sites,Eupatorium adenophorum formed a regional community-gifted.The spreading of Eupatorium adenophorum in mild growth sites was relatively slow,the community was distributed fascicularly and sporadically,the density increased from 3 stems/m2 to 8 stems/m2 after a year,the coverage expanded from less than 5% to near 10%;The density of Eupatorium adenophorum in moderate sites increased from 32 stems/m2 to 103 stems/m2 in the following year and the coverage expended from less than 35% to more than 90%;the coverage,density and height of Eupatorium adenophorum in severe sites reached to the maximum,and accompanying plants were quite rare in the same period.

关 键 词： 弃耕荒地 紫茎泽兰 植物群落 多样性

领　　域： [农业科学]