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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Carbon Stock and Net CO2 Emission in Tropical Upland Soils under Different Land Use) ผู้เขียน: Natthaphol Lichaikul, Amnat Chidthaisong, Narumon Withers Havey, จงรัก วัชรินทร์รัตน์ สื่อสิ่งพิมพ์:pdf AbstractCarbon storage and CO2 emissions were measured during May 2003-February 2004 in three land use types in northeastern Thailand. These included a natural dry evergreen forest (DEF), a reforestation planted with 16-years old Acacia mangium (AC) and a cornfield site (CF). The main objective was to estimate and compare carbon stock as affected by land use type. On the area-basis, the estimated of carbon storages in the upper 50 cm-layer of soil were 118, 66 and 57 ton C ha-1 in DEF, AC and CF soils, respectively. The total carbon storages (standing biomass plus soil carbon, excluding belowground biomass) were 418, 164 and 60 ton C ha-1 in DEF, AC and CF soils, respectively. At forest site, majority of carbon was stored in the standing biomass (71% and 60% of total carbon storage at DEF and AC site, respectively). At CF site, however, about 95% of carbon was stored in the soil. Total net CO2 emission was not significantly different among these three sites (12-17 ton C ha-1 yr-1), presumably due to large spatial and temporal variations. The results indicated that the amount and characteristics of carbon storage differed significantly depending on land use type. Conversion of natural forest to agriculture (after 16 years), in addition to loss of carbon stored in the standing biomass, might result in about 50% loss of soil carbon in the upper 50 cm. On the other hand, reforestation for 16 years might increased soil carbon by 14% (0.6 ton C yr-1) compared with a continuous cultivated soil (maize). |
ที่มา:Agricultural Science Journal (วารสารวิทยาศาสตร์เกษตร)หัวเรื่อง:การดูดซับประจุของดินดอนที่พัฒนามาจากหินกลุ่มแกรนิต บริเวณชายฝั่งทะเลตะวันออกเฉียงใต้ของประเทศไทย |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Lime Application to Two Acidic Upland Soils for Soybean Production in Champasak Province, Lao PDR) ผู้เขียน:วงวิลัย เพงสุวรรณา,  ดร.ทัศนีย์ อัตตะนันทน์, ศาสตราจารย์ , Russell S. Yost สื่อสิ่งพิมพ์:pdf AbstractLow yield of soybean in the Lao People’s Democratic Republic (Lao) have been reported, where soil acidity could be one of the limiting factors affecting crop growth. In Champasak province, Lao, the effect of lime application on soybean production was studied on two acid upland soils, which varied in their chemical and physical properties. The NuMaSS software predicted that lime was needed and that the soil at the Bachieng site needed more lime than the Hoythakoune site. The results illustrated that liming had beneficial effects on soybean. The highest grain yields of soybean at the Bachieng and Hoythakoune site were 2,206 and 2,102 kg ha-1 compared with the control treatment, which yielded 1,462 and 962 kg ha-1, respectively. The results of the study indicated that lime had a strong effect on increasing soil pH, from 4.4 to 5.3 and from 4.7 to 6.0 for the Bachieng and Hoythakoune sites, respectively). The appropriate liming rates for soybean production at the Bachieng and Hoythakoune sites were about 1,710 and 550 kg CaCO3 ha-1, respectively. An economic dominance analysis indicated that the net return from liming was very high for both the Bachieng ($ 402 ha-1) and Hoythakoune ($ 503 ha-1) sites. |