城郊老菜园土壤的肥力演变特征与障碍因素分析

Fertility Changing Characteristics of Long-term Vegetable Planted Soil in Suburban Area and Its Obstacle Factors

2011年在第二次全国土壤普查的采样田块内重新采样进行化验分析,重点探讨了城郊区老菜园土壤的肥力演变趋势及其发展主要障碍因素。研究结果表明:与第二次土壤普查相比,城郊区老菜园土壤酸化现象严重(pH值降低0.4个单位),有机质含量提高12.6%,土壤全磷和速效磷分别增加104%和99%,富集效应明显;土壤已出现耕层变浅、酸化、养分比例失调、盐渍化和重金属超标(主要是Cd、Cu和Zn)等障碍。最后针对上述障碍因素,初步提出了改良培肥城郊老菜园土壤的对策。

In 2011,some soil samples were collected from the fields where the sampling fields for the second national soil survey were,and then the samples were tested and analyzed.The fertility changing trend of long-term vegetable planted soil in suburban area and its main obstacle factors were discussed emphasizely.The results showed that in comparison with the results of the second national soil survey,the soil acidification occurred seriously（soil pH significantly decreased by 0.4 units）;content of organic matters in soil increased by 12.6%;the enrichment of phosphorus in soil was observed（total P and available P increased by 104% and 99%,respectively）.Moreover,there were serious obstacle factors for vegetable growth,such as thinness of plough layer,soil acidification,and nutrients disproportion,and soil salinization,and heavy metals pollution（mainly were Cd,Cu and Zn）.In the end,the countermeasures for soil amelioration and improvement of soil fertility for long-term vegetable planted soil in suburban area were put forward.