深圳市草坪杂草发生季节变化及杂草群落聚类分析

Seasonal Variations and Cluster Analysis of the Turf Weed Communities in Shenzhen,China

用样线法调查了深圳市区不同管理类型草坪的杂草周年发生及分布情况,并用系统聚类法分析了各草坪杂草群落的发生规律。共观察到25科83种草坪杂草,其中春季发生的杂草种类67种,夏季68种,秋季70种,冬季49种,四季共有的种类40种,占总数的48.2%;香附子、光鳞水蜈蚣、狗牙根、千根草等9种杂草为优势种,也是重要的防除对象;深圳市草坪杂草全年共分为15类群落,其中春季3类,夏、秋、冬季各4类,管理水平是影响杂草群落发生特征的最直接因素。

The species composition and seasonal variations of the turf weed communities were investigated in Shenzhen with line intercept method, and all the data obtained were analyzed with cluster analysis. Totally 83 species belonging to 25 families were found ,of which 67,68,70 and 49 species were observed in spring, summer, autumn and winter, respectively. The species occurred in all the four seasons counted for 48.2% of the total species. Cyperus rotundus ,Kylling abrevitolia var. leiolepis,Cynodon dactylon and Euphorbia thymifolia were dominant and the most dangerous weed species. The turf weeds were classified into 15 communities ,of which 3 communities observed in spring while 4 communities investigated in each of the other three seasons. Management level is the most important factor affecting the weed communities＇ structure.