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利用历史资料及典型剖面土样,采用原位采样及相同测定方法研究不同时期黄绵土剖面的养分分布特征及演变趋势。结果表明:近30年来黄绵土中有机质、氮素、磷素含量水平有不同程度提高,耕层变化量最大,耕层有机质、全氮、碱解氮、全磷和速效磷的增加量分别为2.18,0.12,3.53,0.32,5.18 mg/kg。剖面中钾素含量呈减少趋势,耕层变化量最小。黄绵土耕层各养分含量的表聚系数均增大,该区土壤肥力向有利于作物吸收的方向演变。
Using the historical data and the typical section soil samples, the in-situ sampling and the same determination method were used to study the nutrient distribution and evolution trend of the loessial soil sections in different periods. The results showed that the content of organic matter, nitrogen and phosphorus in the loessial soil increased to some extent in the past 30 years, and the variation of topsoil was the largest. The increase of organic matter, total nitrogen, available nitrogen, total phosphorus and available phosphorus in topsoil was 2.18 , 0.12, 3.53, 0.32, 5.18 mg / kg. Potassium content in the profile shows a decreasing trend, and the amount of topsoil changes is the smallest. The polyculture coefficient of each nutrient content in loessial soil increased, and the soil fertility in this area evolved to the benefit of crop absorption.