摘要
以东祁连山2012年建植的不同组合禾草混播草地为对象，研究混播草地建植第1年、第3年的杂草发生规律与变化。结果表明：多年生禾草混作草地建植第1年杂草以密花香薷（Elsholtzia densa）、迷果芹（Sphallero-carpus gracilis）、藜（Chenopodium glaucum）为优势，建植第3年杂草则以迷果芹、甘露子（Stachys sieboldi）、密花香薷、西伯利亚蓼（Polygonim sibir cum）为主；混播草地建植3年的杂草的丰富度指数、Pielou 指数、Shannon －weiner指数高于建植第1年，密度、盖度和生物量低于建植第1年；建植第1年，不同混作组分间丰富度指数、Pielou 指数、Shannon －weiner 多样性指数差异不显著。建植第3年，随混作组分的增加，杂草的丰富度、均匀度和多样性增加，地上生物量、盖度和密度下降。
Abstract
Weed occurrence regularity and change in the first and third years of mixed pasture cultivation was analyzed u-sing different combinations of mixed pasture cultivation in east Qilian Mountains in 201 2.In the first year dominant weeds in cultivated perennial grasses were Elsholtzia densa,Sphallerocarpus gracilis and Chenopodium glaucum,and the third year dominant weeds were S.gracilis,Stachys sieboldi,E.densa and Polygonim sibircum.The richness index,pielou in-dex and Shannon -wiener index for weeds in the third year were higher than in the first year,but the weeds density,cover-age and biomass were less than those found in the first year.In the first year,the richness index,Pielou index and Shan-non -Weiner index of the weeds were not significantly affected by different mixtures.As mixture gradually increased,the richness index,Pielou index and Shannon -Weiner index also increased,but the relative density and aboveground biomass decreased.
基金项目
现代农业产业技术体系(CARS －35)
甘肃省退牧还草科技支撑项目(2012－252－2)
NETL
NSTL
维普
万方数据