文献类型：期刊文献

英文题名：Effects of tree species mixture on soil organic carbon stocks and greenhouse gas fluxes in subtropical plantations in China

作者：Wang, Hui[1] Liu, Shirong[1] Wang, Jingxin[2] Shi, Zuomin[1] Lu, Lihua[3] Zeng, Ji[3] Ming, Angang[3] Tang, Jixin[3] Yu, Haolong[3]

通信作者：Liu, SR[1]

机构：[1]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Chinas State Forestry Adm, Key Lab Forest Ecol & Environm, Beijing 100091, Peoples R China;[2]W Virginia Univ, Div Forestry & Nat Resources, Morgantown, WV 26506 USA;[3]Chinese Acad Forestry, Guangxi Youyiguan Forest Ecosyst Res Stn, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China

年份：2013

卷号：300

起止页码：4-13

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20132116364841);Scopus(收录号：2-s2.0-84877922520);WOS:【SCI-EXPANDED(收录号:WOS:000320425100002)】；

基金：We are grateful to Riming He, Hai Chen, Zhongguo Li, Xueman Huang, Yuan Wen, Jia Xu, Lu Zheng and En Liu for their assistance in field sampling and data collection. We also gratefully acknowledge the support from the Chinese Academy of Forestry's Experimental Center of Tropical Forestry. This study was funded by the Ministry of Finance (200804001 and 201104006), the Ministry of Science and Technology (2011CB403205 and 2012BAD22B01), China's National Natural Science Foundation (31290223 and 31100380) and Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry Foundation (CAFRI-FEEP201104), and was supported by the CFERN & GENE Award Funds on Ecological Paper.

语种：英文

外文关键词：Soil carbon; Soil-atmosphere trace gas exchanges; Mixed plantation; Forest conversion; Subtropical China

摘要：Indigenous broadleaf plantations are increasingly being developed as a prospective silvicultural approach for substituting coniferous plantations in subtropical China. Three plantations of monoculture and mixed Pinus massoniana and Castanopsis hystrix were selected to examine soil organic carbon (SOC) stocks and temporal and spatial patterns of the main greenhouse gases fluxes for understanding the effects of mixed forests on soil carbon and nitrogen (N) cycling processes. We found that SOC stock in 0-20 cm layer in the mixed plantation was 14.3% higher than that in the P. massoniana, and 8.1% higher than that in the C. hystrix plantations. Differences in SOC stock among the plantations were attributed to soil N stock and leaf litterfall input. Soil CO2 and N2O fluxes in the mixed plantation displayed the seasonal trends, while soil CH4 flux did not show the seasonal trend. The seasonal variations in soil CO2 and N2O emissions were positively related to soil temperature and moisture. Mean soil CO2 and N2O emissions (53.2 mg C m(-2) h(-1) and 5.21 mu g N m(-2) h(-1), respectively) were significantly higher in the mixed plantation than in the P. massoniana plantation, while they were lower than in the C. hystrix plantation. Mean soil CH4 uptake (38.4 mu g C m(-2) h(-1)) was significantly higher in the mixed plantation than in the C. hystrix plantation, while it is similar to that in the P. massoniana plantation. Variations in soil CO2 flux among the plantations were influenced by fine root biomass, leaf litterfall mass, soil N stock and soil C:N ratio. Differences in soil N2O flux among the plantations could be attributed to the differences in soil N stock, soil NO3--N content and soil C:N ratio. Soil respiration rate and soil NO3--N content could account for variations in soil CH4 flux among the plantations. This study confirms that the mixed plantation has a higher SOC stock than the monoculture plantations, and there is an increase in amount of GHG absorbed by the soil of mixed plantations compared to C. hystrix plantations. Therefore, a mixture of C. hystrix versus P. massoniana, could be a better silvicultural approach for SOC sequestration than monoculture C. hystrix plantation for substituting P. massoniana plantations in subtropical China. (c) 2012 Elsevier B.V. All rights reserved.