Knowledge Management System of Northwest Institute of Plateau Biology, CAS
| Small-scale variation in ecosystem CO2 fluxes in an alpine meadow depends on plant biomass and species richness | |
| Hirota, Mitsuru1; Zhang, Pengcheng1; Gu, Song2; Shen, Haihua3; Kuriyama, Takeo4; Li, Yingnian2; Tang, Yanhong3 | |
| 2010-07-01 | |
| 发表期刊 | JOURNAL OF PLANT RESEARCH
 |
| ISSN | 0918-9440 |
| 卷号 | 123期号:4页码:531-541 |
| 文章类型 | Article |
| 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 20C 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. |
| 关键词 | Ecosystem Co2 Flux Ecosystem Structure And Functioning Spatial Heterogeneity Species Richness Qinghai-tibetan Plateau |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 关键词[WOS] | QINGHAI-TIBETAN PLATEAU ; CARBON-DIOXIDE EXCHANGE ; NET PRIMARY PRODUCTIVITY ; TEMPERATE GRASSLAND ; SOIL RESPIRATION ; SEASONAL-VARIATION ; VEGETATION ; LIGHT ; VARIABILITY ; ATMOSPHERE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| WOS记录号 | WOS:000278939900015 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://210.75.249.4/handle/363003/2222 |
| 专题 | 中国科学院西北高原生物研究所 |
| 作者单位 | 1.Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 3.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan 4.Toho Univ, Fac Sci, Dept Biol, Chiba 2748510, Japan |
| 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,2010,123(4):531-541. |
| 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,123(4),531-541. |
| 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 123.4(2010):531-541. |
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