农田土壤钙素含量及空间分布规律研究——以武功县大庄乡为例

doi:10.3864/j.issn.0578-1752.2016.05.021

Abstract

Abstract: 【Objective】 To reveal the effects of intensive land use, fertilization and tillage system changes on soil health under the condition of modern agricultural production, the history of the development and evolution of soil in Guanzhong region was studied. 【Method】 Soil samples within 600 m to villages of the same natural conditions and land use types were analyzed for Ca change. Calcium content of samples in radiation lines was compared, and the data of soil survey made in 1982 were used as reference, so the methods of horizontal reference standard and vertical (time) standard were employed for study of the evolution of soil Ca. 【Result】 The results indicated that the variation of soil calcium carbonate and exchangeable calcium in 0-40 cm layer were not obvious in the horizontal scales in the range of 0-400 m from the village, but increased obviously in soils from 400-600 m to the villages. The content of soil water soluble calcium was gradually decreased in the range of 0-600 m. In the range of the same soil layer, the content of calcium carbonate in 0-20 cm layer was lower than that in the 20-40 cm layer. Exchangeable calcium and water soluble calcium was higher than that in the 20-40 cm layer. In 0-40 cm, the content of calcium carbonate 50 m away from the village was lower than that 500 m from the village, and the content in the same layer was lower than that in 1982. The content of calcium carbonate was significantly increased under 40 cm layer. The total storage capacity of soil calcium at 50 m away from the village was significantly higher than that at 500 m in 0-100 cm layer. 【Conclusion】 Therefore, the modern intensive land use and technology measures employed actuated and accelerated the process of soil calcium leaching and deposition in the limited level of space, resulting in the spatial variability of calcium in soils and the concealed degradation process of soil calcium in farmland. Cautions should be paid to the influences of modern agricultural technology measures on soil health.

Key words: CaCO₃, exchangeable Ca, water-soluble Ca

SHI Hong-ping, WANG Yi-quan, SHI Zong-lin, LIANG Hua-xue, WANG Jia-xu . Spatial Distribution and Content of Soil Calcium in Farmland: A Case Study in Dazhuang Town, Wugong County[J].Scientia Agricultura Sinica, 2016, 49(5): 1008-1016.

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