Physicochemical Properties and Carbon and Nutrient Storages of Soils Derived from Volcanic Rock and Sandstone in Dry Dipterocarp Forest at Huai Hong Khrai Royal Development Study Center, Chiang Mai Province
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Abstract
Comparison on physicochemical properties and carbon-nutrient storage in soils derived from two parent rocks, volcanic rock, and sandstone, under a dry dipterocarp forest (DDF) was studied in the Huai Hong Khrai Royal Development Study Center (HHK), northern Thailand. Eight soil pits were made in the DDF, and soil composite samples were collected along the depths. The samples were analyzed for physicochemical properties in a laboratory. Two groups of the soils were found; shallow (<40 cm depth) and deep (100 cm or more). The shallow soils were classified into Order Inceptisols, whereas deep soils were Ultisols, however, the soil pedon of volcanic rock was Oxisols. Most soils contained many gravels and very low bulk densities, except for the Oxisols. The textures of the soils were coarse to medium in topsoils and medium to fine in subsoils. Soil reaction of three soil pits on sandstone was more acid than those on volcanic rocks, except one pedon on sandstone had the neutral. The organic matter, carbon and total nitrogen content in all soils were high in surface soils and less in subsoils. Available phosphorus (P) and extractable cations of potassium (K), calcium (Ca) and magnesium (mg) were very low throughout the soil depths. Amounts of organic matter, carbon, nitrogen, available P and extractable cations in both shallow and deep soils on volcanic rocks were higher than those on sandstone. The DDF soils on two parent rocks had some differences in physicochemical properties and carbon-nutrient storages and are considered as the important factor on plant growth, production, and species diversity.
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References
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