title: [Effects of nitrogen addition on grassland species diversity and productivity in Keerqin Sandy Land].
abstract: 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.
authors: Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China. lilj_86@163.com
authors: Lu-Jun
authors: LJ
authors: Li
authors: De-Hui
authors: DH
authors: Zeng
authors: Zhan-Yuan
authors: ZY
authors: Yu
authors: Gui-Yan
authors: GY
authors: Ai
authors: Dan
authors: D
authors: Yang
authors: Rong
authors: R
authors: Mao
mesh_terms: D044822:Biodiversity; D018533:Biomass; D002681:China; D003889:Desert Climate; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis / Q000494:pharmacology*; D006109:Poaceae / Q000145:classification* / Q000254:growth & development*; D012822:Silicon Dioxide
chemical_list: D005308:Fertilizers; D012822:Silicon Dioxide; D009584:Nitrogen