宁夏荒漠草原种子雨研究

The Study on Seed Rain of Desert Steppe in Ningxia Hui Autonomous Region

近年来,有关土壤种子库研究的报道较多,但种子雨的研究较少,因此以宁夏荒漠草原为研究对象,采用样线法,以培养皿为种子雨收集器,对种子雨的散布特点及种子雨与地上植被的关系进行了研究。结果表明:种子雨的植物种类为8种,多年生草本植物所占比例较大为62.5%;种子雨的散布8—10月份为逐渐递增的趋势,10月份为种子雨散布的高峰期,8—10月份种子雨的密度分别为(73.60±12.24)个/m2,(77.85±11.81)个/m2,(240.62±41.08)个/m2;种子雨植物密度和地上植物密度没有显著的相关性;种子雨植物种和地上植物种的相似性为0.457,相似性较低。研究结果可以为种子雨、种子库、地上植被间相互关系的研究提供参考。

In recent years, the soil seed bank has been widely reported, but few studies on seed rain has been concerned. Therefore, the desert steppe in Ningxia was selected as the study site. By using the line transect method, the Petri dish for seed rain collector, the seed rain characteristics and seed rain and vegetation were studied. The results showed that seed rain covered 8 plant species, perennial herbaceous plants accounted for a larger proportion which was 62. 5%; seed rain from August to October presented gradually increasing trend, in October for the seed rain scatter is the peak, from August to October, seed rain densities were （73.60 ± 12.24） /m2 , （77.85 ±11.81） /m2, （240.62 ±41.08） /m2 , respcectively; seed rain plant densi- ty and aboveground plant density had no significant correlation; similarity of seed rain plant and aboveground plant species was 0. 457, which is the lower similarity. The research results can provide reference for the studies on seed rain, seed bank, the ground vegetation interaction.