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Growths and Carbon Stocks of Para Rubber Plantations on Phonpisai Soil Series in Northeastern Thailand

Case studies of projects in 7 countries suggest that widespread concern about large-scale farming being associated with potentially large risks is justified. Key risks include (i) weak land governance and an associated failure to recognize, protect, or -if voluntary transfer can be agreed upon- properly compensate local communities’ land rights (Alden-Wily 2010); (ii) lack of capacity to process and manage large scale investments, including inclusive and participatory consultations that result in clear and enforceable agreements; (iii) investor proposals that were non-viable technically, or inconsistent with local visions and national plans for development, in some cases leading investors to encroach on. | RUBBER THAI JOURNAL 1 1-18 2012 Journal home page www.rubberthai.com Rubber Research Institute of Thailand ARTICLE INFO Article history Revise 1 January 2012 Revise in revise Presentation of IRRDB Conference 15-16 December 2011 Chiangmai Thailand Accepted 12 January 2012 Available online 15 January 2012 Keywords carbon stock rubber growth rubber plantation biomass Chakkarat soil series Growths and Carbon Stocks of Para Rubber Plantations on Phonpisai Soil Series in Northeastern Thailand Chakarn Saengruksawong Soontorn Khamyong Niwat Anongrak Jitti Pinthong Department of Plant Science and Natural Resources Faculty of Agriculture Institution Chiang Mai University ABSTRACT Growths and carbon stocks in a series of para rubber plantations on Chakkarat soil series in northeastern Thailand were investigated including 1 5 10 15 and 20 years old and a natural forest. Totally 15 40 x 40 m sampling plots were used for studying rubber growths three plots per each aged class plantation and one plot for the natural forest. In each plot stem girth at 1.3 m above ground crown width and height of trees were measured. One rubber tree having the mean growth in each aged class plantation was cut and separated to stem branch leaf and root biomass for making allometry equations. Fifteen soil pits were made in each plot and soil samples were collected along soil profile. Soil physical and chemical properties were analyzed in laboratory. Rubber tree densities varied between 80-109 trees rai 1ha 6.25 rai . Stem girth and height growths were increased with the plantation ages. The growths were very rapid for rubber trees having ages between 1 and 15 years old and become slow for the older trees. The biomass amounts of 1 5 10 15 and 20 years old plantations were in the order of 21.25 55.24 102.39 140.50 and 215.39 Mg ha. Ecosystem carbon stocks in these plantations were increased with tree ages as 26.29 48.28 76.62 95.83 and 135.38 Mg ha respectively. They involved two compartments 1 biomass