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黄土区封育和放牧草地物种多样性和 地上生物量对氮素添加的响应
赵洁1; 李伟2; 井光花2; 魏琳2; 程积民1,2
Source Publication草业学报


Other Abstract

Nitrogen addition can increase the aboveground biomass of the plant community in grasslands.However,
it can also lead to a loss of species diversity,but the mechanisms involved in this process are unclear.The
objective of this study was to explore the effects of nitrogen addition on aboveground biomass,species diversity,
community composition,and the relationship between species richness and aboveground biomass in longterm
fenced grassland and grazed grassland on the semi-arid Loess Plateau.We focused on the differences and
similarities in the grassland responses under these two typical management systems,and tried to identify the
the ecological mechanisms underlying these responses.We added nitrogen at different rates[0,5,10,20,40,
80g CO(NH2)2/(m2·yr)]to long-term fenced grassland and grazed grassland.After 3years of treatment,we
measured aboveground biomass,calculated species diversity indexes(species richness,Shannon-Wiener index,
and Pielou index)and analyzed the relationship between species diversity and productivity using regressionanalyses.The results showed that,in the long-term fenced grassland,nitrogen addition significantly increased
the aboveground biomass and decreased species diversity,while the grazed grassland showed similar but weaker
responses to nitrogen addition.The species diversity in fenced and fertilized grassland decreased as the litter biomass
increased,and also increased with greater light penetration.In comparison,species diversity in grazed
and fertilized grassland decreased slowly and did not change significantly with greater light penetration.The
Shannon-Wiener index was significantly negatively correlated with above-ground productivity in fenced and
fertilized grassland,but no such relationship existed in grazed grassland.These results indicated that grazing
can relieve the negative effect of fertilization on species diversity.Therefore,grazing is a reasonable grassland
management method to retain species diversity while increasing the community aboveground biomass by fertilization.

Keyword放牧 封育 氮素添加 物种多样性 物种多样性 地上生物量 群落组分
Indexed By中文核心期刊要目总览
Document Type期刊论文
Recommended Citation
GB/T 7714
赵洁,李伟,井光花,等. 黄土区封育和放牧草地物种多样性和 地上生物量对氮素添加的响应[J]. 草业学报,2017,26(8):54-64.
APA 赵洁,李伟,井光花,魏琳,&程积民.(2017).黄土区封育和放牧草地物种多样性和 地上生物量对氮素添加的响应.草业学报,26(8),54-64.
MLA 赵洁,et al."黄土区封育和放牧草地物种多样性和 地上生物量对氮素添加的响应".草业学报 26.8(2017):54-64.
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