封育年限对云雾山典型草原植物繁殖与植被更新的影响

发布时间：2018-12-12 06:33

【摘要】：研究封育年限对黄土高原典型草原繁殖更新的影响,为退化黄土高原植被恢复和生物多样性维持提供一定的理论依据。在云雾山自然保护区的实验区选取不同封育年限区(5,15,23,32年)和放牧地(对照)草地作为试验样地,采用挖掘取样法进行草地繁殖更新的研究。结果表明:封育年限对后代繁殖更新苗的物种丰富度影响显著(P0.05)。封育5年草地和封育15年草地的后代更新苗的物种丰富度与放牧地差异不明显(P0.05),而封育23年草地和封育32年草地的后代更新苗的物种丰富度显著小于放牧地。封育年限对草地后代繁殖更新总密度、无性繁殖密度、根茎型、分蘖型、匍匐型和分枝型的繁殖密度均影响显著(P0.05)。随着封育年限的增加,繁殖更新总密度和无性繁殖密度均呈递减趋势,根茎型和分蘖型密度均呈先升高后降低趋势,根蘖型和分枝型密度呈先降低后升高趋势,匍匐型的密度呈逐渐增加趋势,无性繁殖密度与有性繁殖密度之比呈先增加后降低趋势。植物群落密度与无性繁殖密度、繁殖更新总密度之间均呈正显著相关。在云雾山典型草原,短期封育有利于植物后代繁殖更新,长期封育反而不利于草地的繁殖更新,对退化草地封育5年最有利于植物的繁殖更新。植物无性繁殖密度的变化直接影响着繁殖总密度的变化,从而影响了植物群落的密度变化。
[Abstract]:This paper studies the effect of fencing years on reproduction and regeneration of typical steppe in the Loess Plateau, and provides some theoretical basis for vegetation restoration and biodiversity maintenance in degraded Loess Plateau. In the experimental area of Yunwushan Nature Reserve, the grassland of different fencing years (515232,32 years) and grazing land (control) were selected as experimental plots, and the method of excavation sampling was used to study the breeding and regeneration of grassland. The results showed that the species richness of progeny reproduction and regeneration seedlings was significantly affected by the period of fencing (P0.05). There was no significant difference between the species richness of regenerated seedlings and grazing land in 5 years and 15 years (P0.05), but the species richness of regenerated seedlings in 23 years and 32 years was significantly lower than that in grazing land. The total reproductive regeneration density, asexual reproductive density, rhizome type, tiller type, creeping type and branching type were significantly affected by the years of fencing (P0.05). With the increase of the number of years, the total density of reproductive regeneration and the density of asexual reproduction decreased, the density of rhizome type and tiller type increased first and then decreased, and the density of root type and branching type decreased first and then increased. The density of creeping type increased gradually, and the ratio of asexual reproductive density to sexual reproductive density increased first and then decreased. There was a positive correlation between plant community density and asexual reproductive density and total reproductive regeneration density. In the typical grassland of Yunwu Mountain, the short-term fencing is beneficial to the reproduction and regeneration of plant progeny, but the long-term fencing is not conducive to the reproductive renewal of grassland, and 5 years of fencing the degraded grassland is the most favorable for the reproduction and regeneration of the plant. The variation of asexual reproductive density of plants directly affects the variation of total reproductive density, thus affecting the change of plant community density.
【作者单位】：河南科技大学动物科技学院;河南省饲草饲料资源开发与畜禽健康养殖院士工作站;
【基金】：国家自然科学青年基金项目(31302013) 河南省教育厅科学技术研究重点项目(13A2302812013) 河南科技大学博士启动基金项目(09001634)资助
【分类号】：S812

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