摘要
研究了青南地区“黑土滩”退化过程中植被组成、群落综合特征的变化规律,探讨了退化演替的物种替代机制及恢复演替模式。结果表明,在退化演替过程中群落主要种的优势地位发生明显的替代变化。植被覆盖度、地上生物量、优良牧草产量比例随草地退化程度的加剧而明显下降。随着退化程度的加重,草地植物根系逐渐减少,草土比的比值明显减少,比值由轻度退化类型的1:5左右演变到极度退化类型的1:400左右。
The vegetation composition, change law of community synthetical characteristics and species alternation mechanism during grassland degradation, and model of recovery succession were studied on the paper. The results showed that the dominance of main species had obvious alternation change during degradation succession of grassland. Vegetation coverage, aboveground biomass and proportion of good herbages all decreased with grassland degradation. In addition, plant root biomass and ratio of grasses and soil all obviously decreased due to grassland degradation, such as ratio of grasses and soil was 1：5 on lightly degraded grassland while that was about 1：400 on severely degraded grassland.
出处
《中国农学通报》
CSCD
2005年第9期284-285,293,共3页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金资助项目"嵩草属植物繁殖策略与‘黑土滩’形成机制的研究"(39960053)
