TAILIEUCHUNG - Báo cáo khoa học: " Effects of liming and gypsum regimes on chemical characteristics of an acid forest soil and its leachates"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Effects of liming and gypsum regimes on chemical characteristics of an acid forest soil and its leachates. | Ann Sà For 1997 54. 169-1 so Elsevier INRA 169 Original article Effects of liming and gypsum regimes on chemical characteristics of an acid forest soil and its leachates s Belkacem c Nys Cycle hioyeochimique him. 54280 Chanipeiioux. France Received 28 April 1995 accepted 18 March 1996 Summary - A dystric cambisol acid brown soil with an acid mull humus consisting of Of Aị and B horizons was used to study changes in soil and leachate chemistry. The natural soil was reconstituted in columns equipped with zero tension lysimeters. CaCO-Ị. CaCO MgO and CaSO4 treatments were added at rates equivalent to and t ha of CaO. Soil pH and exchangeable cations were determined before treatments were applied and at the end of the 20 month experimental period. Leachates from the columns were analyzed for pH s. Ca Mg Al K N-NO- and N-NH4 at monthly intervals throughout the 20 month period. Liming provoked the greatest increase in the soil pH values. This was limited to the Aị horizon when using the lowest rate but was also observed in B horizon after application of and t ha 1. Exchangeable calcium values were higher in the upper 6 cm but decreased rapidly in the deeper layers. When gypsum was added the pH increased significantly but this was restricted to the humus and A horizons exchangeable calcium was increased significantly down to the B horizon. Aluminium saturation decreased in the layers with high exchangeable calcium and higher pH values. For base saturation patterns similar to calcium were observed throughout the profile. Leachates were enriched with basic cations which increased the pH especially when the high liming rate was applied and also with the and t CaO ha 1 rates of gypsum. Nitrogen was leached mostly as N-NO in the lime treatments and in the control whereas nitrification was inhibited in the gypsum treatment and nitrogen was predominantly in N-NH4 form. acid soil nutrient leachate lime gypsum forest Resume Effets des formes et doses d

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