沙地恢复过程中两种一年生植物种子萌发和幼苗种群动态研究

摘要/Abstract

摘要： 狗尾草和虫实是科尔沁沙地两种常见一年生草本植物,在沙地恢复过程中起着非常重要的作用。采用固定样方法对自然条件下两种植物种子萌发和幼苗种群动态进行了研究。结果表明,沙地恢复不同阶段虫实和狗尾草萌发数量随季节和样地的变化而变化,种子萌发和幼苗存活显示出强烈的降雨依赖性,并且虫实和狗尾草种子当年可萌发数量都随沙地固定程度增加而逐渐增大。从4月到8月,各月虫实种子萌发比例依次降低,但大多数狗尾草种子在5月到6月才开始萌发。虫实和狗尾草种子呈现出分批萌发的策略。虫实和狗尾草主要分4批出苗,相对虫实而言,狗尾草出苗对降雨的响应存在一定的滞后性,且狗尾草萌发所需的温度较虫实高。虫实和狗尾草的存活曲线均属于C型曲线,是较为典型的r对策者。

关键词: 沙地恢复, 一年生植物, 种子萌发, 种群动态

Abstract: Setaria viridis and Corispermum marocarpum are two familiar annual plants in Horqin Sand Land, and the two plant species play a very important role in sand land restoration process. In this study, seed germination and seedling population dynamic of the two plant species were studied by fixed natural quadrats method. The results showed that the germination number of the two plants in different stage of sand land restoration changed with season and site, and the seed germination and seedling survival were strongly dependent on precipitation, and the germination number of two plants in present year increased with sand land fixation. The monthly germination ratios of the two plants decreased from April to August, but most of S. viridis seed germinated during May to June. The two plants germinated in patches. There was some hysteresis for the response of S. viridis germination to precipitation compared to C.marocarpum. The suitable temperature for S. viridis germination was higher than for C. marocarpum. There were C-pattern survival curves for S. viridis and C.marocarpum seedling, and this implied that their life strategy belongs to r-strategy.

Key words: sand land restoration, annual plant, seed germination, population dynamics

中图分类号:

Q945.34

何玉惠;赵哈林;刘新平;张铜会. 沙地恢复过程中两种一年生植物种子萌发和幼苗种群动态研究[J]. 中国沙漠, 2010, 30(6): 1331-1335.

HE Yu-hui;ZHAO Ha-lin;LIU Xin-ping;ZHANG Tong-hui. Seed Germination and Seedling Population Dynamic of Two Annual Plants during Sand Land Restoration Process[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(6): 1331-1335.

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