冻融交替对复配土壤团粒结构和有机质的交互作用

The Interaction of Freezing-thawing on Soil Aggregates and Organic Matter of Pisha Sandstone and Sand Compound Soil

为了研究冻融交替作用下复配土壤团粒结构和有机质之间的关系,采用室内模拟冻融试验方法,分析冻融周期以及团粒结构含量对复配土壤有机质的影响。结果表明,冻融交替经过1,2,5,10周期时各个粒级团粒结构的分配比例有明显变化,<0.5mm的小粒径团粒结构含量增加,>1mm的大粒径团粒结构含量减少;冻融循环对复配土壤有机质含量产生极显著影响,1∶1,1∶2,1∶5复配土壤有机质含量均表现为随冻融周期先增加后减少的趋势,2周期时达到峰值,与冻融前相比,分别增加68%,55%,59%;冻融循环与土壤团粒结构的交互作用显著影响复配土壤有机质含量,冻融交替作用下3种比例复配土壤小团粒结构(粒径<0.5mm)与有机质呈现出较为明显的正相关关系。因此,利用冻融交替作用对砒砂岩与沙复配土壤的团粒结构形成、有机质的影响以及二者之间的交互作用,进行改良土壤结构,提高土壤有机质含量,使土壤结构和有机质得到持续不断的改善和发展。

In order to study the relationship between freezing-thawing on soil aggregate structure and organic matter of Pisha sandstone and sand compound soil,the laboratory simulation of freezing-thawing test method was adopted and the freezing-thawing cycle and soil aggregate content on the influence of soil organic matter were analyzed. The study results showed that freezing-thawing after 1,2,5,10 cycles when the allocation proportion of each size aggregate structure had changed significantly, the small particle aggregate （d0. 5 mm） content increased,large particle aggregates （〉1 mm） content decreased, freezing-thawing cycle significantly influenced on soil organic matter content, 1：1,1： 2 and 1： 5 compound soil organic matter content showed a trend of increasing first and then decreased with the increase of freezing thawing cycles, peaked at 2 cycles. Compared with before freezing-thawing,it increased by 68% ,55% ,59% respectively. The interaction between the freezing-thawing cycles and soil aggregate structure significantly affect the soil organic matter content,under freezing-thawing,three ratio of compound soil small aggregates structure （particle size d0.5 mm） and organic matter showed obvious positive correlation relationship. Therefore, using the effect of freezing-thawing of Pisha sandstone and sand compound soil aggregate structure formation and organic matter and the interaction between them could improve soil structure, increase the content of soil organic matter and make the soil structure and organic matter to improve and develop.