Soil respiration in sloping rubber plantations and tropical natural forests in Xishuangbanna, China
Goldberg, Stefanie Daniela1,2; Zhao, Yongli1,5; Harrison, Rhett D.3,4; Monkai, Jutamart1,2,5; Li, Yuwu6; Chau, Kating7; Xu, Jianchu1,2,5
2017-11-01
发表期刊AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN0167-8809
卷号249页码:237-246
摘要Soil respiration (SR) plays an important role in the global carbon cycle. The widespread and continued conversion of tropical forests to plantations is expected to drastically alter CO2 production in soil, with significant consequences for atmospheric concentrations of this crucial greenhouse gas. In Southeast Asia, rubber plantations are among the most widespread monoculture tree plantations. However, knowledge of how SR differs in rubber plantations compared to natural forests is scarce. In this study, surface CO2 fluxes and soil CO2 concentrations (at 5 cm, 10 cm, 30 cm and 70 cm depths) were measured at regular intervals over a one-year period along slopes at three sites in paired natural tropical forests and mature rubber plantations. Annual surface soil CO2 fluxes were 15% lower in the rubber plantations than in natural forest. This difference was due to substantially lower SR during the dry season in rubber plantations compared to natural forest. During the wet season, SR did not differ significantly between rubber plantations and natural forests. In rubber plantations, soil moisture increased from lower and middle to upper slope positions, but this did not significantly impact SR. Throughout the year, net CO2 production per unit volume in the topsoil (2.5-7.5 cm) exceeded by 2-3 orders of magnitude net CO2 production in the subsoil (7.5-50 cm). However, CO2 originating from 5 cm depth and below in both land cover types could only explain up to 30% of the aboveground measured CO2 flux, indicating that >70% of the total CO2 respired and emitted to the atmosphere originated from the uppermost few cm of the soil. Net CO2 production at different soil depths did not differ significantly between rubber plantations and natural forests. Our results indicate that SR characteristics in mature rubber plantation and natural forest were broadly similar, although dry season soil surface CO2 fluxes were lower in rubber plantations. However, further information on the drivers of CO2 production in the uppermost topsoil layers which are responsible for most CO2 emissions is needed to understand the extent to which these results are generalisable.
关键词Forest Conversion Rubber Plantation Hevea Brasiliensis Soil Respiration Soil Co2 Concentrations Soil Co2 Turnover
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/54866
专题植物化学与西部植物资源持续利用国家重点实验室
作者单位1.Chinese Acad Sci, Kunming Inst Bot, Ctr Mt Ecosyst Studies, Kunming 650201, Yunnan, Peoples R China
2.World Agroforestry Ctr, East & Cent Asia, Kunming 650201, Yunnan, Peoples R China
3.Chinese Acad Sci, Key Lab Plant Div & Biogeog East Asia, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China
4.East & Southern Africa Reg, World Agroforestty Ctr, 13 Elm Rd, Lusaka, Zambia
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Chuxiong Management Bur Yunnan Ailao Mt Natl Nat, Chuxiong, Yunnan, Peoples R China
7.Peking Univ, Coll Life Sci, Ctr Nat & Soc, Beijing 100871, Peoples R China
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Goldberg, Stefanie Daniela,Zhao, Yongli,Harrison, Rhett D.,et al. Soil respiration in sloping rubber plantations and tropical natural forests in Xishuangbanna, China[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2017,249:237-246.
APA Goldberg, Stefanie Daniela.,Zhao, Yongli.,Harrison, Rhett D..,Monkai, Jutamart.,Li, Yuwu.,...&Xu, Jianchu.(2017).Soil respiration in sloping rubber plantations and tropical natural forests in Xishuangbanna, China.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,249,237-246.
MLA Goldberg, Stefanie Daniela,et al."Soil respiration in sloping rubber plantations and tropical natural forests in Xishuangbanna, China".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 249(2017):237-246.
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