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用杨陵地区红油土的耕层及粘化层(混入1/4耕层土壤)作为2种供试土壤,各设不施,施N,施K,施NK4个处理,在30℃下恒温培养。培养期间分期测定NH~+_4—N,NO~-_3—N及非代换性铵,旨在探讨石灰性土壤中NH~+_4—N的硝化与粘土矿物晶层固定的关系。结果表明,硝化形成的NO~-_3—N以指数曲线递增,NH~+_4—N则以幂函数曲线及反S型曲线递减,最终都达到一个比较稳定的水平。耕层土壤中的NH~+_4—N的硝化作用强烈,被土壤固定量少,粘化层则恰好相反。施入氮肥能显著地增加NO~-_3—N,NH~+_4—N及非代换铵的含量。耕层土壤易固定也易释放固定的NH~+_4—N;粘化层固定后不易释放。施K对减少粘化层NH~+_4—N的固定无明显效果。
Using Yangling soil plow layer and sticking layer (mixed with 1/4 tillage soil) in Yangling area as the two kinds of test soil, each treatment was applied N, N, K, NK treatment, at 30 ℃ constant temperature to cultivate. The purpose of this study was to determine the relationship between NH_ + _4-N, NO ~ -_3-N and non-substituted ammonium during staging in order to investigate the nitrification of NH ~ + _4-N and the fixation of clay minerals in calcareous soils. The results showed that NO ~ -_3-N formed by nitrification increased exponentially, and NH_ + _4-N decreased gradually with power function curve and inverse S-curve, eventually reaching a stable level. The nitrification of NH ~ + _4-N in the topsoil is strong, and it is less fixed by the soil, while the viscous layer is the opposite. Application of nitrogen fertilizer can significantly increase the content of NO ~ -_3-N, NH ~ + _4-N and non-substituted ammonium. Topsoil is easy to fix and easy to release fixed NH ~ + _4-N; sticky layer is not easy to release after fixing. Apply K to reduce the adhesion layer NH ~ + _4-N fixed no significant effect.