Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland
文献类型：期刊论文
| 作者 | Wang, Yonghui1,2; Liu, Huiying1,2; Chung, Haegeun3; Yu, Lingfei4; Mi, Zhaorong5; Geng, Yan1,2; Jing, Xin1,2; Wang, Shiping6; Zeng, Hui7; Cao, Guangmin5 |
| 刊名 | global biogeochemical cycles
 |
| 出版日期 | 2014-10-01 |
| 卷号 | 28期号:10页码:1081-1095 |
| 关键词 | winter soil respiration carbon cycling alpine ecosystem soil freezing Tibetan Plateau |
| ISSN号 | 0886-6236 |
| 中文摘要 | the tibetan alpine grasslands, sharing many features with arctic tundra ecosystems, have a unique non-growing-season climate that is usually dry and without persistent snow cover. pronounced winter warming recently observed in this ecosystem may significantly alter the non-growing-season carbon cycle processes such as soil respiration (r-s), but detailed measurements to assess the patterns, drivers of, and potential feedbacks on r-s have not been made yet. we conducted a 4 year study on r-s using a unique r-s measuring system, composed of an automated soil co2 flux sampling system and a custom-made container, to facilitate measurements in this extreme environment. we found that in the nongrowing season, (1) cumulative r-s was 82-89g c m(-2), accounting for 11.8-13.2% of the annual total r-s; (2) surface soil freezing controlled the diurnal pattern of r-s and bulk soil freezing induced lower reference respiration rate (r-0) and temperature sensitivity (q(10)) than those in the growing season (0.40-0.53 versus 0.84-1.32 mu mol co2 m(-2)s(-1) for r-0 and 2.5-2.9 versus 2.9-5.6 for q(10)); and (3) the intraannual variation in cumulative r-s was controlled by accumulated surface soil temperature. we found that in the summer monsoon-dominated tibetan alpine grassland, surface soil freezing, bulk soil freezing, and accumulated surface soil temperature are the day-, season-, and year-scale drivers of the non-growing-season r-s, respectively. our results suggest that warmer winters can trigger carbon loss from this ecosystem because of higher q(10) of thawed than frozen soils. |
| 英文摘要 | the tibetan alpine grasslands, sharing many features with arctic tundra ecosystems, have a unique non-growing-season climate that is usually dry and without persistent snow cover. pronounced winter warming recently observed in this ecosystem may significantly alter the non-growing-season carbon cycle processes such as soil respiration (r-s), but detailed measurements to assess the patterns, drivers of, and potential feedbacks on r-s have not been made yet. we conducted a 4 year study on r-s using a unique r-s measuring system, composed of an automated soil co2 flux sampling system and a custom-made container, to facilitate measurements in this extreme environment. we found that in the nongrowing season, (1) cumulative r-s was 82-89g c m(-2), accounting for 11.8-13.2% of the annual total r-s; (2) surface soil freezing controlled the diurnal pattern of r-s and bulk soil freezing induced lower reference respiration rate (r-0) and temperature sensitivity (q(10)) than those in the growing season (0.40-0.53 versus 0.84-1.32 mu mol co2 m(-2)s(-1) for r-0 and 2.5-2.9 versus 2.9-5.6 for q(10)); and (3) the intraannual variation in cumulative r-s was controlled by accumulated surface soil temperature. we found that in the summer monsoon-dominated tibetan alpine grassland, surface soil freezing, bulk soil freezing, and accumulated surface soil temperature are the day-, season-, and year-scale drivers of the non-growing-season r-s, respectively. our results suggest that warmer winters can trigger carbon loss from this ecosystem because of higher q(10) of thawed than frozen soils. |
| WOS标题词 | science & technology ; life sciences & biomedicine ; physical sciences |
| 类目[WOS] | environmental sciences ; geosciences, multidisciplinary ; meteorology & atmospheric sciences |
| 研究领域[WOS] | environmental sciences & ecology ; geology ; meteorology & atmospheric sciences |
| 关键词[WOS] | increased snow depth ; co2 efflux ; temperature sensitivity ; climate-change ; arctic tundra ; microbial respiration ; ecosystem respiration ; solar-radiation ; vegetation type ; north-america |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000344797500005 |
| 公开日期 | 2014-12-19 |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/4180]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 作者单位 | 1.Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China 2.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 3.Konkuk Univ, Dept Environm Engn, Seoul, South Korea 4.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing, Peoples R China 5.Chinese Acad Sci, Key Lab Adaptat & Evolut Plateau Biota, Northwest Inst Plateau Biol, Xining, Peoples R China 6.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Inst Tibetan Plateau Res, Beijing, Peoples R China 7.Peking Univ, Key Lab Urban Habitat Environm Sci & Technol, Shenzhen Grad Sch, Shenzhen, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Yonghui,Liu, Huiying,Chung, Haegeun,et al. Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland[J]. global biogeochemical cycles,2014,28(10):1081-1095. |
| APA | Wang, Yonghui.,Liu, Huiying.,Chung, Haegeun.,Yu, Lingfei.,Mi, Zhaorong.,...&He, Jin-Sheng.(2014).Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland.global biogeochemical cycles,28(10),1081-1095. |
| MLA | Wang, Yonghui,et al."Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland".global biogeochemical cycles 28.10(2014):1081-1095. |
入库方式： OAI收割
来源：西北高原生物研究所
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