Pedosphere 27(4): 737--746, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Temporal changes of ecosystem carbon stocks in rubber plantations in Xishuangbanna, Southwest China
SUN Yanci1,2,3, MA Youxin1, CAO Kunfang4, LI Hongmei1, SHEN Jinxiang5, LIU Wenjun1, DI Liang1,2 and MEI Cencen1,2
1Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303 (China)
2Yunnan College of Business Management, Kunming 650106 (China)
3University of Chinese Academy of Sciences, Beijing 100094 (China)
4State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, and College of Forestry, Guangxi University, Nanning 530004 (China)
5 Yunnan Land and Resources Vocational College, Kunming 650217 (China)
Corresponding Author:SUN Yanci
      Rubber (Hevea brasiliensis) plantations have been expanded rapidly in tropical regions of Southwest China and cover more than 20% of land area in Xishuangbanna. Several studies have addressed changes of soil C stocks in rubber plantations; however, estimates of total ecosystem C stocks and their temporal changes in rubber plantations have been inadequately studied. This study calculated C stocks in soil, biomass, litter, and dry rubber (latex), and estimated the total ecosystem C stock of rubber plantations in an age sequence of 3-, 7-, 9-, 21-, 27-, and 34-year-old in Xishuangbanna. The total C stocks in rubber plantations ranged from 150.3 to 283.7 Mg C ha-1, with a mean of 213.4 Mg C ha-1. The plantations ≤ 9-year-old had significantly lower (P < 0.05) total C stocks than those older than 9 years. Carbon stocks were 107.1--170.5 Mg C ha-1 in soil (mass equivalent) and 2.8--95.7 Mg C ha-1 in living biomass, representing the largest and the second largest C components in a rubber plantation ecosystem. Neglect of dry rubber C stock resulted in an underestimate of 7.8%--14.2% of the total C stock in the rubber plantations older than 9 years, which was much larger than the contribution of litter C stock (less than 2%).
Key Words:  age sequence, carbon sequestration, dry rubber, Hevea brasiliensis, litter
Citation: Sun, Y., Ma, Y., Cao, K., Li, H., Shen, J., Liu, W., Di, L. and Mei, C. 2017. Temporal changes of ecosystem carbon stocks in rubber plantations in Xishuangbanna, Southwest China. Pedosphere. 27(4): 737-746.
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