Soil Carbon Stock in Cambodian Monsoon Forests

Toriyama, Jumpei; Ohta, Seiichi; Ohnuki, Yasuhiro; Ito, Emiko; Kanzaki, Mamoru; Araki, Makoto; Chann, Sophal; Tith, Bora; Keth, Samkol; Hirai, Keizo; Kiyono, Yoshiyuki

doi:10.6090/jarq.45.309

Cited by 15 publications

(11 citation statements)

References 18 publications

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“…This parameter implied that water infiltration might be more rapid in the CF soil, and the higher organic matter in its profiles might increase the water retention. Toriyama et al (2011) found that soil carbon stock as a major component of organic matter was highly positively correlated with soil water content. The contents of gravel within the upper 100 cm horizons in the CF were somewhat lower than in the UF.…”

Section: Role Of Soils In Water Storagementioning

confidence: 93%

Water storages in plants and soils in two community forests of Karen tribe, northern Thailand

Khamyong

Seeloy-ounkeaw

Anongrak

et al. 2014

Tropics

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This study aims to evaluate the roles of community forests managed for different purposes on water storages in plants and soils as the basic information for watershed management. Community forests of Karen people in Chiang Mai province, northern Thailand, were divided to conservation (CF) and utilization (UF) forests. These community forests were classified as pinemontane and montane forests. The number of tree species in the CF and the UF was 256 and 132, respectively. Shannon-Wiener Index in the CF (4.5±0.6) was higher than in the UF (3.4±1.0). Forest biomass was higher in the CF (252.4±72. , respectively. More than 90 % of water was stored in soil. The maximum capacities of water storage within 2 m soil depths of the CF and the UF were 9584 ±934 and 9463 ±233 m 3 ha -1 , respectively. The water storage amounts in soils in rainy season were 73.8 % and 79.2 % of maximum capacities in the CF and the UF, respectively. In winter, the storages changed to 80.5 % and 74.6 %, and in dry season they decreased to be 39.5 % and 23.7 %. Timber harvest in the UF was the main cause of forest degradation and decrease in biomass water storage. The water storage by these community forests can reduce flash flooding and water supply from them is greatly beneficial to the villagers＇ livelihood and also to the lower land communities.

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Section: Role Of Soils In Water Storagementioning

confidence: 93%

Water storages in plants and soils in two community forests of Karen tribe, northern Thailand

Khamyong

Seeloy-ounkeaw

Anongrak

et al. 2014

Tropics

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“…Usuga et al (2010) pointed out the importance of land-use history for analyzing soil carbon stocks, while Sakai et al (2010) reported that the accumulation of carbon stock after conversion from arable land to forest plantation was only evident in the organic layer and the surface soil layer with 0 -5 cm in the Japanese cedar and cypress stands younger than 25 years-old.. With reference to fine root distribution in the top 0 -15 cm soil layer and litter on the forest floor, comparison of soil carbon stocks should be limited to the upper soil horizons, where the active component of soil organic carbon is concentrated. In addition, Toriyama et al (2011) showed the importance of parent materials for soil carbon accumulation: basaltic and calcareous parent materials accumulated about twice the carbon stock compared to sedimentary rocks in the forest ecosystems in Cambodia and Thailand. The top soil carbon accumulation, ranging from 32 to 38 MgC ha -1 within the 0 -15 cm layer, was relatively high, probably due to the influence of the limestone parent material, although no clear differences emerged between the teak plantation and the natural forest.…”

Section: Fig 7 Vertical Distributions Of Soil Carbon Stocks In the mentioning

confidence: 99%

“…In MDF of Thailand, the soil carbon stocks at depths of 15 cm and 1 m were 26.7 and 71.0 MgC ha -1 (Tangsinmankong et al, 2007). Soil carbon at a depth of 0 -30 cm (MgC ha -1 ) on the sandstone and conglomerate was 27.6 while that on the limestone was 74.9 under MDF in Thailand (summarized by Toriyama et al, 2011).…”

Section: Soil Carbon Stockmentioning

confidence: 99%

Carbon Cycling in Teak Plantations in Comparison with Seasonally Dry Tropical Forests in Thailand

Takahashi¹,

Marod²,

Panuthai³

et al. 2012

Forest Ecosystems - More Than Just Trees

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“…At a distance of 20 m from plots 5-8, a 2-m-depth soil profile investigation was conducted in May 2003. Details and a comparative study of the soil profile have been reported elsewhere and described as DEF1 47 , KH-E1 48 , KPT2 51 , and one of the four profiles of EFS over sedimentary rocks 53 .…”

Section: Experimental Litter-removal Plotsmentioning

confidence: 99%

“…Despite recent intensive investigations into Cambodian forest ecosystems 39 , especially concerning forest soil [47][48][49] , groundwater resource capacity 2,29,51 , and tree biomass C stock 20,38 , the linkage between above-and belowground C stock information remains scant 19,53 . Additionally, information on the effects of forest changes on soil properties mainly concern land-use conversion (e.g.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Surface-soil Properties after Litter-removal Manipulation in a Cambodian Lowland Dry Evergreen Forest

Ito

Toriyama²,

Araki³

et al. 2014

JARQ

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Litter plays key roles in forest ecosystems, and forest degradation is likely to spur a further decline in leaf litterfall inputs to forest soils. However, the effects on physicochemical surface-soil properties remain largely unknown, especially in seasonal tropical forest ecosystems. We initiated a litterremoval manipulation experiment in a Cambodian lowland evergreen forest undergoing intensive selective logging. Litter removal performed for 2 and 4.4 years respectively triggered an increase in bulk density and decrease in surface-soil carbon (C) and nitrogen (N) contents to 67 and 73% of the original levels, respectively. After only 2 years of treatment, bulk density rose to very high value (>1.40 Mg m -3 ) likely preventing further soil compaction, while the C and N reduction effects lasted over 2 years. Greater soil compaction occurs in stands with a smaller initial bulk density. However, C (N)-rich soils did not necessarily lose a greater relative proportion of C (N) than C (N)-poor soils. Although N remained above C following the litter removal, conservative trends in the C:N ratio suggested a limited capacity for N retention. Together, our data suggest that shifts in leaf litter inputs in response to localized human disturbances may have rapid and lasting consequences on physicochemical surface-soil properties; possibly accelerated by a tropical climate. Moreover, a speedy recovery to an adequate litter supply, at least before reaching the upper soil compaction limit, is essential to conserve forest ecosystems.

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Soil Carbon Stock in Cambodian Monsoon Forests

Cited by 15 publications

References 18 publications

Water storages in plants and soils in two community forests of Karen tribe, northern Thailand

Water storages in plants and soils in two community forests of Karen tribe, northern Thailand

Carbon Cycling in Teak Plantations in Comparison with Seasonally Dry Tropical Forests in Thailand

Physicochemical Surface-soil Properties after Litter-removal Manipulation in a Cambodian Lowland Dry Evergreen Forest

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