右江河谷地区空心莲子草的发生与分布

Occurrence and Distribution of Alternanthera philoxeroides in Youjiang River Valley

于2018年9-11月对广西壮族自治区右江河谷4个县(市、区)不同生境空心莲子草(Alternanthera philoxeroides)的发生及分布情况进行调查。结果表明,右江河谷4个县(市、区)的河道、农田田埂、沟渠、道路边、绿化带均有空心莲子草的分布。其中,田埂发生频率最高,其次为沟渠、道路边。与其他生境相比,活水沟渠生长的空心莲子草较其他生境的表现最为旺盛。在地理区划分布上,田阳区、田东县的空心莲子草分布面积最大,右江区与平果市在农田、绿化带、村宅旁有少量分布,且具有局部种群密度高、聚集性强的特点,但面积比其他县(市、区)小。

The occurrence and distribution of Alternanthera philoxeroides were investigated in different habitats of four cities(districts or counties)in the Youjiang river valley of Guangxi Zhuang Autonomous Region from September to November 2018.A.philoxeroides distributed in watercourses,farmland ridges,ditches,roadsides and green belts of the four districts or counties of the Youjiang river valley.It occurred at highest frequency in the farmland ridges,followed by the ditches and roadsides.A.philoxeroides growing in ditches of flowing water had the highest population advantage compared with other habitats.A.philoxeroides was most widely distributed in Tianyang district and Tiandong county.A.philoxeroides was less disseminated in the farmlands,green belts and villages houses of Youjiang district and Pingguo city,with characteristics of high local population density and strong aggregation,although the area was smaller than in other districts or counties.