首页|Seasonal changes in the relationship between species richness and community biomass in grassland under grazing and exclosure, Horqin Sandy Land, northern China

Seasonal changes in the relationship between species richness and community biomass in grassland under grazing and exclosure, Horqin Sandy Land, northern China

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How species diversity-productivity relationships respond to temporal dynamics and land use is still not clear in semi-arid grassland ecosystems.We analyzed seasonal changes of the relationships between vegetation cover,plant density,species richness,and aboveground biomass in grasslands under grazing and exclosure in the Horqin Sandy Land of northern China.Our results showed that in grazed and fenced grassland,vegetation cover,richness,and biomass were lower in April than in August,whereas plant density showed a reverse trend.Vegetation cover during the growing season and biomass in June and August were higher in fenced grassland than in grazed grassland,whereas plant density in April and June was lower in fenced grassland than in grazed grassland.A negative relationship between species richness and biomass was found in August in fenced grassland,and in grazed grassland the relationship between plant density and biomass changed from positive in April to negative in August.The relationship between the density of the dominant plant species and the total biomass also varied with seasonal changes and land use (grazing and exclosure).These results suggest that long-term grazing,seasonal changes,and their interaction significantly influence vegetation cover,plant density,and biomass in grasslands.Plant species competition in fenced grassland results in seasonal changes of the relationship between species richness and biomass.Long-term grazing also affects seasonal changes of the density and biomass of dominant plant species,which further affects the seasonal relationship between plant density and biomass in grasslands.Our study demonstrates the importance of temporal dynamics and land use in understanding the relationship between species richness and ecosystem function.

densitysandy grasslandproductivityspecies richnesslinear relation

XiaoAn Zuo、XueYong Zhao、TongHui Zhang、ShaoKun Wang、YaYong Luo、Xin Zhou

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Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

Knowledge Innovation Program of the Chinese Academy of Sciences国家自然科学基金国家自然科学基金Key Project of Scientific and Technical Supporting ProgramsWest Light Foundation of the Chinese Academy of Sciences

KZCX2-EW-QN31341171414410711852011BAC07B02-09O928711001

2013

10.3724/SP.J.1226.2013.00177

寒旱区科学(英文版)
中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

CSCD
影响因子：0.237
ISSN：1674-3822
年,卷(期)：2013.5(2)
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