摘要
基于2007、2008年对冀北南山嘴沙荒地的封育区、未封育区植被种类组成和数量特征的调查,通过Shannon-Wiener生态位计算公式和对称α法(Pianka公式)分析了演替初期干扰对种群生态位的影响,研究了短期封育对沙荒地植被恢复的作用。结果表明:短期封育使植被状况得到了明显的改善,封育区的植被盖度、生物量指标均有42%以上的显著提高。经短期封育,多花胡枝子(Lespedeza floribunda)代替猪毛蒿(Artemisia scoparia)、细野麻(Boehmeria gracilis)、金毛狗尾草(Setaria viridis)等成为群落优势种。短期封育对优势植物种群在总种群中所占比例影响不大,但能够促进优势种间的竞争和共存,使得资源得到更为充分的利用。由于2007年降水少于2008年,优势种群间的生态位重叠值的分布趋势也由2007年的分散分布变为2008年的集中分布;而且由于降水增加,2008年未封育区优势种群的总体竞争水平较2007年有了明显提高。
A survey on composition and quantitative characteristics of vegetation species was conducted in an enclosed area and a non-enclosed area in a sandy badlands of Nanshanzui,northern Hebei Province. The effects of short-term enclosure on vegetation restoration in the badlands were studied using Shannon-Wiener coefficient and Pianka＇s coefficient by analyzing the disturbance of enclosure to population niche in early succession. Result showed that vegetation condition became much better in the enclosed-area due to the obviously increased vegetation coverage and biomass （ more than 42% ） . By short-term enclosure,Lespedeza floribunda predominated instead of Artemisia scoparia,Boehmeria gracilis and Setaria viridis. The effect of short-term enclosure on the proportion of dominant plant populations was unobvious,while it promoted the competition and coexistence between dominant populations. The utilization of environmental resources became more sufficient. Owing to water conditions in different years,the distribution trend of niche overlap values of dominant populations changed from a dispersed distribution in 2007 to a concentrated distribution in 2008. Compared with the year of 2007,the level of competition for dominant populations was improved in 2008 for the improvement of water condition.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第6期49-52,共4页
Journal of Northeast Forestry University
基金
“十一五”国家科技支撑计划项目(2006BAD03A11)
国家教育部留学回国人员基金资助项目(20071108)
关键词
短期封育
退化山地
植被恢复
生态位
生态位重叠
Short-term enclosure
Degraded mountainous areas
Vegetation restoration
Niches
Niche overlap
