Pedosphere 23(2): 169--176, 2013
ISSN 1002-0160/CN 32-1315/P
©2013 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Changes in soil physicochemical properties following land use change from paddy fields to greenhouse and upland fields in the southeastern basin of Dianchi Lake, Yunnan Province, China |
N. MORITSUKA1 ,T. NISHIKAWA1, S. YAMAMOTO2, N. MATSUI3, H. INOUE1, LI Kun-Zhi4, and T. INAMURA1 |
1 Laboratory of Plant Production Systems, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502 (Japan)
2Kagoshima University, Korimoto, Kagoshima 890-8580 (Japan)
3KANSO Technos, Chuo-ku, Osaka 541-0052 (Japan)
4Kunming University of Science and Technology, Yunnan 650024 (China) |
| ABSTRACT |
| Paddy fields in the southeastern basin of Dianchi Lake have rapidly changed to greenhouses since 1999. A total of 61 surface soil samples, including 43 greenhouse soils, 12 upland soils, and 6 paddy soils, were collected from a flat lowland area mainly used for agricultural production fields in the southeastern basin of Dianchi Lake. Analyses of the soil samples indicated that the greenhouse soils were characterized by a lower organic matter content, lower pH, and higher soluble nutrients than the paddy soils in the area. The lower organic matter content of the greenhouse soils was ascribed to environmental or management factors rather than the clay content of the soil. Accumulation of soluble nutrients, especially inorganic N, was due to over-application of fertilizers, which also caused soil acidification. The average amount of readily available N, P, and K accumulated in the greenhouse soils was estimated to be equal to or higher than the annual input of these nutrients as a fertilizer, indicating that a reduction in fertilizer application was possible and recommended. In contrast, a very low available Si content was observed in the paddy soils, suggesting the need for Si application for rice production. |
| Key Words: available Si, greenhouse soils, inorganic N, phosphorus, salinization |
| Citation: Moritsuka, N., Nishikawa, T., Yamamoto, S., Matsui, N., Inoue, H., Li, K. Z. and Inamura, T. 2013. Changes in soil physicochemical properties following land use change from paddy fields to greenhouse and upland fields in the southeastern basin of Dianchi Lake, Yunnan Province, China. Pedosphere. 23(2): 169-176. |
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