摘要
以陇中黄土高原旱地连续7 a保护性耕作定位试验为基础,通过测定株数、盖度、鲜重等指标,计算了农田杂草群落的优势度、物种丰富度、香农威纳指数、辛普森指数、均匀性指数、相似性指数,并分析了不同耕作方式对农田杂草群落组成及物种多样性的影响,结果表明:传统耕作秸秆覆盖、免耕、免耕秸秆覆盖3种耕作方式下,豌豆、小麦田的藜科杂草发生较为普遍,灰绿藜(Chenopodium glaucum)、藜(Chenopodium album)、地肤(Kochia sco-paria)、猪毛菜(Salsola collin)的综合优势度达43.78,3种耕作方式下杂草群落物种多样性差异不显著(P<0.05).杂草群落之间种相似性系数的变化表明,传统耕作秸秆覆盖、免耕及免耕秸秆覆盖经过多年实施后,农田杂草群落开始逐步向较稳定的传统耕作杂草群落方向演替.
Based on the orientated experiment of protective cultivating for seven years in dry land of the Loess Plateau in the middle of Gansu Province, some species indexes,including the dominance degree, species richness,Shannon-Wiener index,Simpson index and Sorensen index, of weed communities were calculated, and effects of different tillage methods on weed community composition and species diversity were also analyzed. The results showed that. in three different treatments of conventional tillage with straw cover （TS）,no-till with no straw （NT）, no-till with straw cover （NTS）, some species of Chenopodiaceae as weeds developed generally in wheat and pea field, among which total dominance degree of Chenopodium glaucum,Chenopodium album, Kochia scoparia and Salsola collin reached to 43. 78. Species diversity of weed communities under three tillage models had no significant difference to each others. Changes of similarity coefficient among weed communities showed that species composition of weed communities in the fields treated with TS, NT and NTS for several years would gradually changed toward that in the fields under conventional tillage.
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2009年第3期122-127,139,共7页
Journal of Gansu Agricultural University
基金
科技部科技支撑计划项目(2006BAD15B06)
关键词
保护性耕作
杂草群落
物种多样性
黄土高原
protective cultivation
weed community
species diversity
Loess Plateau
