温度变化对伊犁绢蒿荒漠土壤种子萌发的初步研究

为探明土壤种子库种子萌发对未来温度变化的响应机制，采用模拟控温方法，研究了不同温度处理（10℃/20℃，20℃/30℃）对伊犁绢蒿荒漠土壤种子库种子萌发密度、物种组成、幼苗株高及生物量的影响。结果表明：温度增加后围栏内外土壤种子库及总体可萌发种子数量呈现降低，低温下物种丰富度高于高温，且增温对围栏内土壤种子库种子萌发的抑制作用高于围栏外。增温抑制伊犁绢蒿、涩芥、新疆落芒草、鹤虱、角果毛茛、针茅的萌发数量，促进小画眉草、灰藜的萌发。温度升高抑制了伊犁绢蒿、涩芥株高的生长，降低了萌发幼苗的总体生物量及其群落高度，促进小画眉草株高的增加。总之，温度升高不利于伊犁绢蒿荒漠土壤中种子的萌发及其萌发幼苗的生长。

Temperature Change Affects Seed Germination of Soil Seed Bank in Seriphidium tranasillense Desert

The paper aims to explore the response mechanism of seed germination in soil seed bank to temperature change in the future, the authors studied the effect of different temperature treatments (10℃/20℃, 20℃/30℃) on seed germination density, species composition, height and biomass of seedlings in soil seed bank in Seriphidium tranasillense desert by adopting simulation temperature control method. The results showed that: the seed germination quantities of soil seed bank under inside and outside fence and the total soil seed bank decreased after increasing temperature, and the species richness under low temperature was higher than that of high temperature; the inhibition of seed germination in soil seed bank in inside fence was higher than that of outside fence; the warming inhibited the seed germination quantities of S. tranasillense, Malcolmia africana, Piptatherum kokanicum, Lappula myositis, Ceratocarpus arenarius, Stipa capillata, and promoted the germination quantities of Eragrostis minor and Chenopodium serotinum. Warming inhibited the plant height of S. tranasillense and M. africana, decreased the total biomass and height of germination seedlings community, and promoted plant height of E. minor. In conclusion, warming was unfavorable for the seed germination in the soil and its growth of germination seedling in Seriphidium tranasillense desert.