摘要
选取-5-5℃作为研究温度,以24 h（12 h冻结,12 h消融）为一个冻融循环,研究吉林西部大安灌区水田0-30 cm土壤有机碳以及土壤酶活性（脱氢酶、多酚氧化酶、过氧化氢酶和脲酶）的剖面特征,分析了二者之间的相关性。结果表明：冻融过程中,土壤有机碳、脱氢酶、多酚氧化酶、过氧化氢酶和脲酶均随土壤深度的增加而递减;0-10 cm土壤有机碳含量增加,10-20 cm和20-30 cm土壤有机碳含量降低,其变化趋势与含水率一致;过氧化氢酶变化较小,脱氢酶和脲酶总体增加,而多酚氧化酶活性降低;土壤有机碳与酶活性的相关性大小表现为：脲酶〉多酚氧化酶〉脱氢酶〉过氧化氢酶。冻融作用改变了土壤中水环境,抑制了土壤微生物呼吸和酶的分解作用,影响土壤有机碳的积累。
With-5-5 ℃ as study temperature,12 h freezing and 12 h thawing as a freezing-thawing-cycle（FTC）,the soil organic carbon（SOC） and enzyme activities of 0 -30 cm paddy soil in Da＇an,west of Jilin Province which involve dehydrogenase,polyphenol oxidaze,catalase and urease,were monitored and analyzed their correlation during FTC. Results indicated that during FTC,SOC,dehydrogenase,polyphenol oxidaze,catalase and urease were decreased with the soil depth increased. 0-10 cm SOC increased,while 10-20 cm SOC and 20-30 cm SOC decreased as the same as soil moisture content.Catalase had little change,dehydrogenase and urease decreased,while polyphenol oxidaze increased. The relationship between SOC and enzyme activities was in the order as urease polyphenol oxidaze dehydrogenase catalase. Soil FTC changed water environment and inhibited microbial activity,which affected on the accumulation of SOC.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第10期1-6,共6页
Environmental Science & Technology
基金
国家自然科学基金项目:吉林盐碱水田区全年候土壤有机碳变化机理及变暖潜势研究(51179073/E090303)
吉林省科技厅青年基金项目:北方城市大气环境污染与气候变化的耦合研究(20140520148JH)
关键词
水田土壤
冻融作用
土壤有机碳
酶活性
paddy soil
freezing and thawing cycles
soil organic carbon
enzyme activity
