Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness

NWIPB OpenIR

	Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness
	Hirota, Mitsuru ; Zhang, Pengcheng ; Gu, Song ; Shen, Haihua ; Kuriyama, Takeo ; Li, Yingnian ; Tang, Yanhong
	2010-07-01
发表期刊	JOURNAL OF PLANT RESEARCH ; Mitsuru Hirota;Pengcheng Zhang;Song Gu;Haihua Shen;Takeo Kuriyama;李英年;Yanhong Tang.Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness,Journal of plant research,2010,123():531-541
摘要	Characterizing the spatial variation in the CO2 flux at both large and small scales is essential for precise estimation of an ecosystem’s CO2 sink strength. However, little is known about small-scale CO2 flux variations in an ecosystem. We explored these variations in a Kobresia meadow ecosystem on the Qinghai-Tibetan plateau in relation to spatial variability in species composition and biomass. We established 14 points and measured net ecosystem production (NEP), gross primary production (GPP), and ecosystem respiration (Re) in relation to vegetation biomass, species richness, and environmental variables at each point, using an automated chamber system during the 2005 growing season. Mean light-saturated NEP and GPP were 30.3 and 40.5 lmol CO2 m-2 s-1 [coefficient of variation (CV), 42.7 and 29.4], respectively. Mean Re at 20 C soil temperature, Re20, was -10.9 lmol CO2 m-2 s-1 (CV, 27.3). Re20 was positively correlated with vegetation biomass. GPPmax was positively correlated with species richness, but 2 of the 14 points were outliers. Vegetation biomass was the main determinant of spatial variation of Re, whereas species richness mainly affected that of GPP, probably reflecting the complexity of canopy structure and light partitioning in this small grassland patch.; Characterizing the spatial variation in the CO2 flux at both large and small scales is essential for precise estimation of an ecosystem's CO2 sink strength. However, little is known about small-scale CO2 flux variations in an ecosystem. We explored these variations in a Kobresia meadow ecosystem on the Qinghai-Tibetan plateau in relation to spatial variability in species composition and biomass. We established 14 points and measured net ecosystem production (NEP), gross primary production (GPP), and ecosystem respiration (Re) in relation to vegetation biomass, species richness, and environmental variables at each point, using an automated chamber system during the 2005 growing season. Mean light-saturated NEP and GPP were 30.3 and 40.5 mu mol CO2 m(-2) s(-1) [coefficient of variation (CV), 42.7 and 29.4], respectively. Mean Re at 20A degrees C soil temperature, Re-20, was -10.9 mu mol CO2 m(-2) s(-1) (CV, 27.3). Re-20 was positively correlated with vegetation biomass. GPP(max) was positively correlated with species richness, but 2 of the 14 points were outliers. Vegetation biomass was the main determinant of spatial variation of Re, whereas species richness mainly affected that of GPP, probably reflecting the complexity of canopy structure and light partitioning in this small grassland patch.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/30979
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Hirota, Mitsuru,Zhang, Pengcheng,Gu, Song,et al. Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness[J]. JOURNAL OF PLANT RESEARCH, Mitsuru Hirota;Pengcheng Zhang;Song Gu;Haihua Shen;Takeo Kuriyama;李英年;Yanhong Tang.Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness,Journal of plant research,2010,123():531-541,2010.
APA	Hirota, Mitsuru.,Zhang, Pengcheng.,Gu, Song.,Shen, Haihua.,Kuriyama, Takeo.,...&Tang, Yanhong.(2010).Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness.JOURNAL OF PLANT RESEARCH.
MLA	Hirota, Mitsuru,et al."Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness".JOURNAL OF PLANT RESEARCH (2010).