Li Lu-Jun, Zeng De-Hui, Yu Zhan-Yuan, Ai Gui-Yan, Yang Dan, Mao Rong
Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
Ying Yong Sheng Tai Xue Bao. 2009 Aug;20(8):1838-44.
Species diversity and productivity are the important indices of the structure and functioning of ecosystems. With Keerqin sandy grassland as test object, this paper studied its species composition, species diversity, and productivity under effects of different level nitrogen (N) addition. Nitrogen addition altered the species composition and the dominant species in the community, increased the vegetation height and coverage, and decreased vegetation light penetration. With the increase of N addition, both the species richness and the diversity decreased. Nitrogen addition increased the aboveground biomass significantly (P<0.01). There was a significant positive relationship between species richness and vegetation light penetration (P<0.01), and a significant negative relationship between species richness and vegetation coverage (P<0.01). It was suggested that nitrogen deposition and artificial nitrogen addition would affect the species composition, species diversity, and productivity of sandy grassland ecosystem.
物种多样性和生产力是生态系统结构与功能的重要指标。本文以科尔沁沙地草原为研究对象，研究了不同水平氮（N）添加对其物种组成、物种多样性和生产力的影响。氮添加改变了群落中的物种组成和优势物种，增加了植被高度和盖度，降低了植被透光率。随着氮添加量的增加，物种丰富度和多样性均降低。氮添加显著增加了地上生物量（P<0.01）。物种丰富度与植被透光率之间存在显著正相关（P<0.01），与植被盖度之间存在显著负相关（P<0.01）。研究表明，氮沉降和人工施氮会影响沙地草原生态系统的物种组成、物种多样性和生产力。
