窄行平作密植大豆田杂草群落组成与发生特点

Composition and occurrence characteristics of weed community in flat-planting narrow-row solid-seeded soybean fields

通过W曲线五点取样法，调查窄行平作密植大豆田的杂草群落组成和发生特点。调查结果表明，窄行平作密植大豆田杂草群落组成复杂，为多种优势杂草群落，不同地区杂草群落组成不同；种群密度大，发生密度200株／m左右。发生特点表现为：杂草群落按逻辑斯蒂（Logistic）曲线模式增长；发生较集中，发生高峰期仅10d左右；杂草发生高峰期比大豆出苗高峰期早4～5d。

Through W-sampling technique with 5 sampling points, the species composition and occurrence characteristics of weed community were investigated in fiat-planting narrow-row solid-seeded soybean fields. The composition of weed community was complicated and diverse in different regions, and several dominant weeds were identified. The weed population density was about 200 plants/m^2 in fiat-planting narrow-row solid-seeded soybean fields. Weed community increased with the mode of Logistic curve. The peak period of weed occurrence was about 10 days, which was 4-5 days earlier than that of the soybean.