The interspecies association among several dominant populations in 3 portions (early, mid, and late-melting portion) , which were established along snowmelt gradient was compared in a natural alpine snow bed on eastern Qinghai-Tibetan plateau. The results showed that the overall association among the dominant species appeared positive association, no association, and negative association in earlymelting, mid-melting, and late-melting portions, respectively. In terms of association correlation coefficients in each species pair, positive association was in majority in early-melting portion, almost half positive and half negative in mid-melting portion, and negative was in majority in late-melting portion. Carex atrofusca subsp. minor and Polygonum macrophyllum had the strongest association in earlymelting portion, while in mid-melting portion was association of C. atrofusca subsp. minor and Pyrethrum tatsienense, and in late-melting portion was association of P. tatsienense and C. atrofusca subsp. minor. It indicated that snowmelt time had a strong effect on interspecies association in alpine meadow community.%以青藏高原东部的一个天然高山雪床为样点,根据融雪梯度,设置早融、中间和晚融3个融雪部位,并对各个部位几种优势牧草种群间的联结性进行比较.结果表明:几种优势牧草的总体关联性在早融部位表现为正联结,中间部位表现为无联结,而晚融部位则表现为负联结.各种对间的联结性以早融部位正联结占多数,中间部位正负几乎各占50%,晚融部位负联结占多数.在早融部位以黑褐穗苔草和圆穗蓼间的联结性强度最强,中间部位以黑褐穗苔草和川西小黄菊间的联结性最强,晚融部位以川西小黄菊和圆穗蓼的联结性最强.说明,融雪时间对高山草地物种间联结性的影响较大.
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