Soil Organic Carbon Loss and Turnover Resulting from Forest Conversion to Maize Fields in Eastern Thailand

被引：39

作者：

Jaiarree, S. ^{[1
]}

Chidthaisong, A. ^{[1
,2
]}

Tangtham, N. ^{[2
]}

Polprasert, C. ^{[3
]}

Sarobol, E. ^{[4
]}

Tyler, S. C. ^{[5
]}

机构：

[1] King Mongkuts Univ Technol Thonburi, Joint Grad Sch Energy & Environm, Bangkok 10140, Thailand

[2] Kasetsart Univ, Fac Forestry, Bangkok 10900, Thailand

[3] Thammasat Univ, Sirindhorn Int Inst Technol, Pathum Thani 12121, Thailand

[4] Kasetsart Univ, Fac Agr, Bangkok 10900, Thailand

[5] Norco Coll, Dept Chem, Norco, CA 92860 USA

来源：

PEDOSPHERE | 2011年 / 21卷 / 05期

关键词：

C stocks; forest-derived C; land-use change; maize-derived C; stable carbon isotope; C-13 NATURAL ABUNDANCE; SOUTHEAST-ASIA; MATTER TURNOVER; LAND-USE; ENVIRONMENTAL CONSEQUENCES; ISOTOPE FRACTIONATION; SWIDDEN CULTIVATION; COSTA-RICA; DYNAMICS; NITROGEN;

D O I：

10.1016/S1002-0160(11)60160-4

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Soil organic carbon (SOC) content and its stable carbon isotopic composition (within the upper 1 m) were measured to determine the effect of land-use changes from dry evergreen forest to maize fields in eastern Thailand. Digital land cover maps, derived from aerial photography and satellite images for years 1989, 1996, and 2002 were used in association with field surveys and farmer interviews to derive land-use history and to assist in study site selection. Conversion from forest to maize cultivation for the duration of 12 years reduced SOC stocks at the rate of 6.97 Mg C ha(-1) year(-1). Reduction was most pronounced in the top 10 cm soil layer, which was 47% after 12 years of cultivation. Stable carbon isotope data revealed that the main fraction lost was forest-derived C. Generally low input rates of maize-derived C were not sufficient to maintain SOC at the level prior to forest conversion. After 12 years of continuous maize cultivation, the maize-derived C fraction made up about 20% of total SOC (5 Mg ha(-1) of the total 25.31 Mg ha(-1)).

引用

页码：581 / 590

页数：10

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