δ^<13>C Values of Organic Carbon in Cropland and Forest Soils in Japan

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概要

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• The carbon content and natural ^<13>C abundance (δ^<13>C) of soil organic carbon were determined for Japanese cropland and nearby forest soils by continuous flow CN analysis with mass spectrometry. The δ^<13>C values of organic carbon from cropland soils in the Hokkaido District ranged between-27 and-24‰, suggesting that soil organic carbon originated mainly from C_3 plants, while the δ^<13>C values from those in Main Island, Shikoku, and Kyushu Districts ranged between-25 and-17‰, indicating that up to 70% of soil organic carbon originated from C_4 plants (presumably Miscanthus sinensis). The δ^<13>C values of organic carbon from Imaichi and Tanegashima forest soils showed that carbon was largely of C_3 plant origin in the surface soils but in deeper horizons the values were strongly affected by the organic carbon of C_4 plant origin. Sugarcane cultivation for 36 y in Tanegashima cropland soils had resulted in the increase of the soil δ^<13>C values to around-15‰. In Shizuoka Prefecture, the δ^<13>C values of soil organic carbon of non-volcanic ash Andosols under forests at Iwata and Makinohara were within the ranges of C_3 plant origin. The values in volcanic ash Andosols at Fuji indicated that the soil carbon in the surface horizons mainly originated from C_3 plants while that in deep soil horizons largely from C_4 plants. Tea cultivation for more than 40 y had led to a decrease of the δ^<13>C values at Fuji by 2-4‰. In the Miyako Island sugarcane fields, the δ^<13>C valtues of the plow layers were apparently affected by sugarcane, a C_4 plant species, compared to the subsoils where a large fraction of carbon originated from C_3 forest plants. The shift from forest to sugarcane cultivation markedly decreased the carbon content and increased the δ^<13>C values of soil organic carbon from-27-25‰ to-17-14‰ within 25 y.

• 社団法人日本土壌肥料学会の論文

著者

• MORITA Akio

  Department of Neurosurgery and Stroke Unit, Kanto Medical Center, NTT East Corporation

• Liyanage Bandunee

  Department Of Civil Engineering The Open University Of Sri Lanka

• Nakanishi Yasuhiro

  Miyako Subtropical Experimental Farm Tokyo University Of Agriculture

• Yoneyama Tadakatsu

  Plant Nutrition Diagnosis Laboratory, National Agriculture Research Center

• Morita Akio

  Department Of Applied Biological Chemistry Shizuoka Uiniversity

• Liyanage Bandunee

  Department Of Environmental Engineering Faculty Of Engineering Osaka University

• Yoneyama Tadakatsu

  Plant Nutrition Diagnosis Laboratory National Agriculture Research Center

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