摘要
[目的]明确氮素添加对退化草原、优势种生态位与种间关联度的影响，为退化草原的管理与恢复提供理论依据。[方法]以退化草原优势种为研究对象，分析群落物种间关联性、物种生态位及生态位重叠，研究不同浓度的氮素添加对退化草原种间关系的影响。[结果]低、中水平氮素添加群落中羊草与多根葱呈显著负相关；随着氮素浓度的增加，羊草、针茅生态位宽度逐渐变大，多根葱生态位宽度逐渐减小。[结论]在群落的恢复过程中，氮素添加提高了羊草竞争能力。
Abstract
Objective] The aim was to study effects of nitrogen addition on dominant species niche and species association in degraded grass-land, to provide theoretical basis for management and restoration of degraded grassland.[Method] Species associations, niche and niche over-laps of dominant species were analyzed to indicate relationships among species in degraded grassland under different concentrations of nitrogen addition.[ Result] The results showed that negative significant association was observed between Leymus chinensis and Allium polyrhizum when low and medium level nitrogen was added into community; Increasing nitrogen could expand the niche breadth of Leymus chinensis and Stipa grandis, at the same time, narrow the niche breadth of Allium polyrhizum.[Conclusion] During the recovery of degraded community, nitrogen addition can improve the competitive ability of Leymus chinensis.
国家科技期刊平台
NSTL
维普
万方数据