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已发生钾素耗竭的土壤能否进行修复,能修复到什么程度,这对土壤供钾能力的恢复具有重要意义,也关系到农业的可持续发展。试验采用不同的物理方法,对耗竭后黑土的钾素修复进行了研究。结果表明:物理修复方法即干湿交替、恒湿、淹水及冻融交替都能不同程度的提高耗竭后土壤中速效钾的含量,使供试黑土达到一定的钾素修复效果。但其中冻融交替处理的修复效果最好,其速效钾的平均增加量和平均增加率为39.2 mg/kg,81.5%。其余3种物理方法的修复效果依次为干湿交替处理:30.8 mg/kg,64%;恒湿处理:29.8 mg/kg,58.2%;淹水处理:15.2 mg/kg,31.6%。这说明相比之下冻融交替是一种较好的修复速效钾的物理方法,因此本地区土壤冬天封冻、春天开化的气候条件对黑土中速效钾的修复起重要作用。
It is of great significance for the recovery of soil potassium availability and the sustainable development of agriculture that the soil depleted of potassium depletion can be repaired and to what extent. The experiment uses different physical methods to study the potassium restoration of depleted black soil. The results showed that the physical restoration methods such as alternate wetting and drying, constant humidity, flooding and freezing and thawing could both increase the content of available potassium in the soil after the exhaustion to some extent, and achieve certain potassium restoration effect for the tested black soil. However, the freezing and thawing alternation treatment was the best, the average increase and average increase rate of available potassium was 39.2 mg / kg and 81.5% respectively. The rest three kinds of physical methods were followed by dry-wet alternation treatment: 30.8 mg / kg, 64%; constant humidity treatment: 29.8 mg / kg, 58.2%; flooding treatment: 15.2 mg / kg, 31.6%. This shows that compared with the freeze-thaw alternation is a better physical method of quick-acting potassium restoration, so the winter frozen soil in the region, the spring climate of climate change plays an important role in the restoration of available potassium in the black soil.