In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

175Table 1. D. alatus plantation area during 1962-1967, TritreungPlantation StationPlantingYearArea(ha)Budget(ThaiBaht)1962 8 34,0001963 16 44,0001964 19 49,0001965 19 41,9231966 4.5 49,8721967 18 17,000Total 84.5 235,795remainingarea todaySupervisorMr. Prasert PakdeeMr. Prasert PakdeeMr. Thammasak SuwapatMr. Thammasak SuwapatMr. Prasert PakdeeMr. Prasert PakdeeSource: Nakhon Sawan Regional Forest Office, 19868Remarks1. D. alatus trees planted during1963-1967 were damaged byfire and the area was substitutedwith teak.2. Data from Nakorn SawanRegional Forest Office wastransferred to SilvicultureResearch Center No. 5 inKampaeng Phet, in 1996.Apart from the plantation at Tritreung, there are four other smallplantations and two roadside plantings of D. alatus that have been used forgene conservation purposes and were mainly used as additional seed sourcesby RFD (Table 2)Table 2. Major ex situ gene conservation sources of D.alatus by the RFDNo. Site Location Status Area(ha)1. Bang Saphan Noi Bang Saphan Noi DistrictPrachuab Khiri Khan Province2. Reforestation Researchand Training StationWang Naam Khaew DistrictNakhon RatchasimaProvinceExperimental 0.16plot(Undisturbed)Gene bank 1.6Remarks3. Paa Huay Khayaeng Tong Phaaphum District Plantation 0.16Kanchanaburi Province (Undisturbed)4. Taa Yaang Petchaburi Taa Yaang DistrictPetchaburi Province- Planting alongroadside5. Sarapee Forest CheckPointNhong Phueng districtChiang Mai province- Planting alongroadside6. Kew Tubyang Mae Chan districtPlantationChiang Rai provinceTotal 1.92Plantation of D. alatus by Forest Industry Organization (FIO)FIO, a semi-government organization, has established plantations for industrialpurposes. Although D. alatus was not a main species for plantation by FIO, D.alatus was planted both as pure stands and in mixed stands in an agroforestrysystem. The plantation of D. alatus was established at Lang Suan district,Chumphon province in 1977 on an area of 22 rai (3.52 ha) and at Somdet