摘要
本文研究了受不同程度热辐射后的水稻土中有机质组分的变化情况,结果表明:随温度升高,土壤中水溶性有机碳(DOC)含量先增加后减少,200℃变化尤为显著,增加为CK的3.68~7.45倍,中性糖、糖醛酸与DOC的变化趋势一致。辐射温度不同,土壤中的胡敏酸、富里酸组成和含量亦发生不同程度的变化,300℃胡/富比值最大(1.79~5.04),土壤腐殖质聚合程度增加;200℃胡敏酸的E4/E6比值最大,反映此温度下土壤芳香缩合度低、具有较多的脂族结构物质、土壤腐殖化程度低。
The variation features of the components of organic matter in paddy soils under different thermal radiation temperatures were revealed. The results indicated that the content of dissolved organic carbon (DOC) increased initially and then reduced with the temperature rise, and a significant increase was observed at 200℃, which was 3.68-7.45 times of that of CK. Meanwhile, the neutral sugars and uronic acid showed the similar trend as DOC. Upon heating, the components and the contents of humic acids and fulvic acids in the paddy soils changed differently. The humic-to-fulvic ratio increased most at 300℃ (1.79-5.04) which indicated the humus at this temperature was less polymerized than others, whereas, the E4/E6 ratio of humic acids was maximal at 200℃, which means more aliphatic materials and low aromatieity condensation and humiflcation degree in the soils.
出处
《土壤》
CAS
CSCD
北大核心
2009年第4期630-634,共5页
Soils
基金
国家自然科学基金项目(No.40571088)资助
关键词
热辐射
水溶性有机质
胡敏酸
富里酸
Heating, Dissolved organic matter, Humic acids, Fulvic acids