黄土丘陵沟壑区铁杆蒿群落种间联结性研究

Study on the Interspecific Association of the Artemisia sacrorum Community in Loess Hilly Region.

取样技术对种间联结性的测定有很大影响 ,取样面积过大、过小以及取样数目过少都会造成较大偏差。黄土丘陵沟壑区铁杆蒿群落的取样面积在 0 .12 5～ 1m2 、取样数不小于 6 0时能取得良好的测定效果。对于其它群落 ,样方面积的大小可以根据样方中平均出现的物种数占统计物种数的 5 5 %～ 80 %来确定。铁杆蒿群落中有 8个种对具有显著正联结 ,11个种对具有显著负联结 ,这种联结是种间竞争、种间互利或偏利以及物种对环境的趋同或分异的结果。根据物种对生境的要求并结合种间联结系数星座图 ,11个物种可以划分为 2个生态种组。

The sampling technology has a key effect on the measure of the interspecific association. A good result can be acquired from Artemisia sacrorum community when sampling area is between 0.125m 2 and 1m 2 and the sampling numbers are more than 60.As for other communities,the area can be determined according to 55%～80% of the ratio of the number of the species in the sample to the statistical species.There are 8 pairs of species with positive association and 11 pairs with negative association.The association is related to the competition,benefit and the living condition of the species.According to the constellation diagrams,11 species can be divided into two ecospecies groups in Artemisia sacrorum community.