【摘要】 试验通过对不同处理下的玉米田生态系统中杂草进行调查研究,统计分析放牧前各杂草的生物多样性指数,地上生物量。结果表明:从杂草群落多样性角度看,林芝玉米田养鹅处理后的多样性指数为1.87,比对照高0.56,处理间差异显著(P<0.05);玉米田养鹅处理后的优势度指数均值为0.79,比对照高0.11,处理间的差异不显著(P>0.05);玉米田养鹅处理后的均匀度指数均值为0.78,比对照低0.05,处理间的差异不显著(P>0.05);玉米田养鹅处理后的物种丰富度指数均值为2.12,比对照高0.90,处理间的差异不显著(P>0.05)。从杂草群落生产力角度看,林芝玉米田养鹅处理的地上生物量均值为347.30g,比对照高330.62g,处理间的差异极显著(P<0.01)。从杂草群落多样性与生产力之间的相关性来看,林芝多样性指数和物种丰富度指数均与地上生物量极显著相关(0.8<R<1);均匀度指数与地上生物量显著相关(0.8<R<1);均匀度指数与地上生物量不显著相关(-0.4<R<-0.2)。玉米田养鹅方式管理的农田生态系统提高了物种多样性和地上生物量,物种多样性与地上生物量显著相关性高,物种多样性的提高促进了群落生产力的提高。更多还原

【Abstract】 The study was carried out by investigating the weeds in the corn field ecosystem under different treatments to analyze the biodiversity index and aboveground biomass of the weeds before grazing. The results showed that, from the perspective of the diversity of weed community, the diversity index of raising geese group was 1.87, which was 0.56 higher than that of the control group, and the difference was significant(P< 0.05).The mean of the dominance index of the cornfield raising geese was 0.79, which was 0.11 higher than the control group, and the difference was not significant(P> 0.05).The evenness of cornfield raising goose was 0.78, which was 0.05 less than the control group, and the difference was not significant(P> 0.05).The mean index of species richness was 2.12, which was 0.90 higher than the control group, and the difference was not significant(P> 0.05).From the perspective of the productivity of weed community, the mean of the ground biomass in Nyingchi cornfield raising goose was 347.30 g, which was 330.62 g higher than the control, and the difference between processing was significant(P<0.01).In terms of the correlation between the diversity and productivity of weed community, the indexes of the diversity and species richness of the Nyingchi were significantly correlated with the biomass of the ground(0.8<R<1).The uniformity index was significantly correlated with the biomass of the ground(0.8<R< 1);the uniformity index was not significantly correlated with the biomass of the ground(-0.4<R<-0.2). Corn field management of farmland ecosystem raising goose way increased the species diversity and biomass on the ground, moreover, there was a significant relationship between species diversity and biomass on the ground, and high species diversity was improved to promote the improvement of productivity in the community.更多还原