河口低热河谷区辣木林四季杂草调查研究

对河口低热河谷区辣木林四季杂草种类、群落组成进行调查。结果表明,该辣木林有杂草73种,隶属22科65属,其中外来入侵种19种,占杂草总数的26.0%。通过分析四季主要杂草的优势度得出,春、夏、秋季优势杂草主要是菊科的鬼针草(Bidens pilosa),禾本科的马唐(Digitaria sanguinalis)、十字马唐(Digitaria cruciata)、光头稗(Echinochloa colona)、牛筋草(Eleusine indica)等组成;冬季优势杂草主要有菊科的鬼针草、小飞蓬(Conyza canadensis)、鼠麴草(Gnaphalium affine)、野茼蒿(Gnaphalium affine)组成。其中,鬼针草为常年优势杂草,在四季杂草组成中外来入侵杂草优势明显。

Investigation of Weeds in Moringa Plantation in Yunnan Hekou Low-hot River Area in Four Seasons

Weed species and their communities in Moringa plantations in low-hot river area in Hekou,Yurnan Province were investigated in 4 seasons.The results showed that there were 73 species of weeds belonging to 22 families and 65 genera in the Moringa plantations,of which there were 19 species of alien invasive weeds accounting for 26％ of the total weeds.The analysis of dominance of main weeds in four seasons showed that dominant weeds in spring,summer and autumn were Bidens pilosa,Digitaria sanguindis,Digitaria cruciata,Echinochloa colona,Eleusine indica,etc.Dominant weeds in winter were Bidens pilosa,Conyza canadensis and Gnaphalium affine.Among all the weeds,B.pilosa was a perennial dominant weed in all seasons and is hence a highly dominant alien invasive weed in all the weeds in 4 seasons.