Carbon and Macronutrient Storages in a Dry Dipterocarp Forest with Enriched Three Needle Pine (Pinus kesiya Royle ex Gordon), Northern Thailand
Thananiti Thichan, Soontorn Khamyong, Niwat Anongrak and Panida Kachina
Storages of carbon and micronutrient in the ecosystem of dry dipterocarp forest (DDF) with 34-year-old enrich pine (Pinus kesiya Royle ex Gordon) were investigated at the Huai Hong Khrai Royal Development Study Center (HHKRDSC). This study used a method of plant community analysis for studying plant species diversity and biomass production. Ten sampling plots, 40x40 m2 in size, were arranged using a random technique over the forest from about 226 m to 518 m above mean sea level. Forest biomass of 86 plant species was calculated using allometric equations. The total plant biomass was estimated to be 101.62 Mg/ha. The total amounts of stored carbon (C), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) in the biomass were calculated to be 50.18 Mg/ha, 463.75 kg/ha, 53.38 kg/ha, 229.54 kg/ha, 899.23 kg/ha, and 134.98 kg/ha, respectively. Pinus kesiya had the highest amount of nutrient storage, followed by Dipterocarpus tubercula, Dipterocarpus obtusifolius, Shorea obtusa, etc. The total amounts of C, N, extractable P, extractable K, extractable Ca and extractable Mg in a one-meter soil profile were evaluated to be as follows: 13.51 Mg/ha, 804.95 kg/ha, 50.95 kg/ha, 3,523.94 kg/ha, 1,752.54 kg/ha and 2,337.48 kg/ha, respectively. Thus, the total ecosystem storages of carbon and nitrogen were in the following order: 63.69 Mg/ha and 1,268.70 kg/ha. The planted pine could increase carbon and nitrogen stored in forest biomass as 36.19% and 35.88% of the total, respectively.