[Effects of nitrogen addition on grassland species diversity and productivity in Keerqin Sandy Land].
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.
Li
Lu-Jun
LJ
Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China. lilj_86@163.com
Zeng
De-Hui
DH
Yu
Zhan-Yuan
ZY
Ai
Gui-Yan
GY
Yang
Dan
D
Mao
Rong
R
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
D005308:Fertilizers; D012822:Silicon Dioxide; D009584:Nitrogen