贵州省烟田杂草优势种群的种间联结关系

在样方调查的基础上，采用方差比率法、Pearson点相关系数和X²检验分析贵州烟田杂草优势种群的种间关系。结果表明：①贵州省烟田杂草优势种的总体联结性为显著的正联结，处于比较稳定的状态；②Pearson点相关系数有21个种对呈正相关，23个种对呈负相关，尼泊尔蓼与繁缕无联结关系；③牛膝菊与马唐、尼泊尔蓼之间正联结关系达到极显著水平，牛膝菊与鸭趾草、马唐与尼泊尔蓼之间正联结关系为显著水平，其他种对之间均为不显著水平。本文旨在了解和掌握烟田杂草在群落中的分布状况，烟田杂草群落的演替趋势及为烟田杂草的防除提供基础资料。

Interspecific Relationships among the Dominant Weeds Species of Tobacco Field in Guizhou Province

Based on the datasets from sampling plots, the interspecific relationships among dominant weeds species of tobacco field in Guizhou province were studied by using the methods of variance analysis, Pearson’s correlation and X²-test. The results indicated that: ①The total associations among all the dominant weeds species of tobacco field in Guizhou are remarkably positively significant in stable state; ②There were positive associations for 21 pair-species, negative associations for 23 pair-species and no association between Stellaria media (L.) Cyr. and Polygonum nepalense Meisn. by Pearson point correlation coefficient; ③The remarkably significantly positive interspecific associations were found between Galinsoga parviflora Cav. and Digitaria sanguinalis(L.) Scop., G.parviflora and P.nepalense, the remarkably positive interspecific associations were found between G.parviflora and Commelina communis L., D.sanguinalis and P.nepalense and the others were unremarkable. The study arms to realize and master the distribution of tobacco field weeds in community and change the trend of tobacco field weeds, and supply the basic data for tobacco field weeds control.