元谋干热河谷干湿季侵蚀沟草本群落优势种种间关系研究

Dominant Species of Herbaceous Community in the Erosion Ditch of Dry and Wet Season in Yuanmou Dry-hot Valley

草本优势种对于干热河谷侵蚀沟地区的水土保持与生态恢复具有重要意义。本研究采用样方法、重要值法、种间联结分析法,对元谋干热河谷侵蚀沟地区干湿季草本群落优势种种间关系进行研究与分析。AC值、X^2值变化最大的前6个种对干季数值均小于湿季;完全负联结(AC=-1)显示干季(总种对的52.38%)草本优势种种间关系较湿季(总种对46.42%)负联结更为显著;X^2值显示湿季种间联结性均为极显著负联结,占总种对数的100%,其中扭黄茅-孔颖草之间的显著性变化湿季(X^2=23.240)较干季(X^2=10.751)更为显著;OI值均处于[0,0.5],湿季干季群落各个物种出现在同一个样方的几率较小,草本优势种群落较为单一。该研究有利于进一步探索和筛选适合干湿季水保效应的不同优势种对。

Herbaceous dominant species are great significance for soil and the water conservation and ecological restoration in gully area of dry-hot valley.Sample methods,importance value methods,and interspecific association analysis were used in this study.The values of the first six species with the greatest changes in AC and X^2 values are lower in the dry season than in the wet season;complete negative association(AC=-1)showed that the interspecific relationship of dominant species in the dry season(52.38%of the total species pair)was more significant than that in the wet season(46.42%of the total species pair);the X^2 value illustrates that during wet season interspecific association is extremely significant,100%of total species logarithm,among them,the significant change between the Heteropogon contortus and Bothriochloa pertusa was most significant in the wet season(X^2=23.240)than in the dry season(X^2=10.751);OI values are between[0,0.5],it indicates that the probability of each species appearing in the same plot in the wet season dry season community is small,herb dominant species community is relatively single.This study is helpful for further exploration and selection of different dominant species pairs suitable for water and soil conservation in dry and wet seasons.