摘要
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。
Whether the soil which had been exhaustive could be restored and what＇s the extent of restoration was of significance for the recovery of K supply in soil and sustainable development of agriculture production. In this study, different physical methods were used to study the recovery of K in black exhaustive soil. The results indicated that physical recovery methods such as alternate dry and wet, constant humidity, flooding, alternate freezing and thawing can increase the content of available K at different levels in the exhaustive soils and make black soil have reached a certain degree of K recovery. Alternate freezing and thawing had the best effect on available K recovery with the average increasing rate of 81.50% and the average increasing amount of 39.2 mg/kg. The recovery rate and amount of other three physical methods were that alternate dry and wet was 64% ,30.8 mg/kg, constant wet was 58.2% ,29.8 mg/kg and flooding was 31.6% ,15.2 mg/kg. It indicated that alternate freezing and thawing was a better physical method of recovery available K and the local climate of freezing in winter and melting in spring played very important role in the remediation of available K in black soil.
出处
《水土保持学报》
CSCD
北大核心
2010年第3期136-139,共4页
Journal of Soil and Water Conservation
基金
国土资源部项目(12120105-11208)
关键词
黑土
速效钾
钾素耗竭
钾素修复
物理方法
black soil
available K
exhaustive K
recovery K
physical method
