黑土土壤质量演变初探I——不同开垦年限黑土主要质量指标演变规律

根据土壤质量的定义和研究方法 ,对黑土的主要质量指标演变规律进行初步研究。结果表明 :黑土的颗粒组成受开垦历史影响的程度较小 ,其质地没有发生显著变化 ;黑土的有机质、全氮、全硫和全磷随着黑土开垦时间的增加而不断降低 ;速效磷随黑土开垦时间的增加有增高的趋势。经过统计分析 ,黑土中粉砂(0.05～0.002mm)含量与细砂(0.25～0.05mm)和粘粒(<0.002mm)含量具有相关性,黑土有机质含量与全氮、全硫、全磷和速效钾具有明显的正相关。因此 ,初步认为黑土中粉粒和有机质含量可以作为土壤物理和养分方面的质量指标

An Approach to the Changes of Black Soil Quality (I) —— Changes of the Indices of Black Soil with the Year(s) of Reclamation

The changes of main fertility indices of black soil (Isohumisol) were investigated according to the definition of soil quality. The results showed that the texture of black soil was little affected by the history of reclamation. The soil organic matter (SOM), total N, total S and total P declined with the increase of reclamation years, but the total K hardly changed. The available P had a trend of increase with the history of reclamation, but the available K went up in the beginning and lowered with the time of reclamation. The statistic results suggested that the contents of silt and organic matter could be served as the integrated fertility indices of black soil.