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采用室内土柱淋溶法,通过模拟降雨,研究了由紫色泥土、草炭、保水剂、消毒剂、微生物肥、尿素、过磷酸钙、硫酸钾等按不同比例配制的2种基质对N、P、K淋溶的影响。结果表明:基质所含养分在同一场次淋溶试验中,淋溶液中N、P、K元素的养分浓度均随降雨时长的增加呈幂函数降低;随着淋溶场次的增加,基质淋溶液中的养分浓度先升高至峰值后逐渐下降并在后期趋于稳定;淋溶液中N、P、K元素的养分损失量与降雨量的关系呈正相关。经综合分析,基质A能更好地保持水土及土壤养分,为人工土壤的发展提供必要的理论依据。
The indoor soil column leaching method was adopted to simulate the rainfall. The effects of two kinds of matrices prepared from purple soil, peat, water retaining agent, disinfectant, microbial fertilizer, urea, superphosphate and potassium sulfate on N, P , K leaching effect. The results showed that in the same leaching experiment, the nutrient concentrations of N, P and K in leaching solution decreased with the increase of rainfall duration. With the increase of leaching stage, The nutrient concentration of the leaching solution firstly increased to a peak value and then decreased gradually and stabilized in the latter part. The nutrient loss of N, P and K elements in the leaching solution was positively correlated with the rainfall. After comprehensive analysis, matrix A can better maintain soil and soil nutrients, and provide the necessary theoretical basis for the development of artificial soil.