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Absorption of atmospheric NO2by plants and soils

1979; Taylor & Francis; Volume: 25; Issue: 3 Linguagem: Inglês

10.1080/00380768.1979.10433174

1747-0765

Tadakatsu Yoneyama, Tsumugu Totsuka, Akira Hashimoto, Jinya Yazaki,

Soil Carbon and Nitrogen Dynamics

Abstract A volcanic ash soil in Ibaraki Prefecture (pH 5.7) with various water conditions was fumigated with 1 ppm NO2 1 continuously, and the changes in the concentrations1 of ammonia, nitrite, and nitrate in different soil layers were traced in comparison with the changes in the non-fumigated soils. In the fumigated soils, nitrite accumulated only in the upper soil layer (0-2 em). NO2 sorbed by the soil seemed to be converted into nitrite and nitrate, and some of the nitrite may be further oxidized to nitrate; the latter reaction was more active in the continuously wetted soil. Ammonia concentration was also increased by NO2 fumigation. The nitrite and nitrate which accumulated in the upper layer were transferred, following the movement of water, and in the lower layers, the nitrite disappeared at the faster speed than in the upper layer. These results suggest that atmospheric NO2 is sorbed at the upper soil layer in the forms of nitrate and nitrite, and it is easily moved downwards into the soil by watering. There is a probability that NO2-nitrogen sorbed by soils is taken up by the plants.