380-11 Evaluation by Solid-State 13C NMR and 13C/12C Analyses of Organic Carbon Dynamics In O and A Horizons of Temperate Deciduous and Evergreen Forests In Japan and Tropical Rainforest In West Sumatra, Indonesia.



Wednesday, October 19, 2011
Henry Gonzalez Convention Center, Hall C, Street Level

Rie Kishimoto1, Yuri Yamazaki1, Yuki Shibuya1, . Thahirna2, Shendy Nofrita2, Sunday E. Obalum3, Yoshinori Watanabe1, Hermansah Karani2 and Toshiyuki Wakatsuki1, (1)Faculty of Agriculture, Kinki University, Nara, Japan
(2)Department of Soil Science, Andalas University, West Sumatra, Indonesia, Padang, Indonesia
(3)Department of Soil Science, University of Nigeria, Nsukka, Nigeria
Organic matter dynamics, structural change, and stable isotope ratio (12C/13C) were compared in O layer and A horizon (0-10 cm) in two temperate forests (secondary experimental deciduous forest of Kinki University and primary evergreen forest of Kasuga Taisha Shrine, Nara) in Japan and a tropical rainforest in West Sumatra, Indonesia. The O layer was stratified into Oi, Oe and Oa sub-layers, corresponding to undecomposed, intermediately decomposed and well decomposed or humified litter, respectively. In the deciduous forest, the range of the amount of carbon in litterfall for a period of one year was 2.5-5.5 t C/ha, with higher values on the upper slope than in the valley position. In the evergreen forest, the corresponding range was 2.5-3.6 t C/ha, with higher values on the upper slope than lower slope. In the Sumatra tropical rainforest, the corresponding range was 4.2-5.4 t C/ha. The carbon stocks in the entire O layer for a period of one year was 5.1-6.3 t/ha in the deciduous forests, 5.1-6.0 t/ha in the evergreen forests and 4.9-5.0 t/ha in the tropical rainforest. The range of the soil humic carbon stocks in the A horizon was 20-27 t/ha in deciduous forest, 63-81 t/ha in evergreen forest, and 13-16 t/ha in the tropical rainforest. The 13C NMR study showed that there was a structural change in soil humus content of the Oi, Oe, Oa layers and A horizon in the three forests. The ratio of aliphatic (0-40 ppm) and carboxyl (171-190 ppm) carbon tended to increase with increase in the amount of litter decomposed in the Oi to Oa layers and A horizon in the two temperate forests. We will discuss in details the mechanisms behind the differences in carbon stocks among the three forests examined.
See more from this Division: S07 Forest, Range & Wildland Soils
See more from this Session: General Forest, Range and Wildland Soils: II