交替冻融对东北典型土壤腐殖质的影响  

Freeze-thaw cycles effects on humic substances in typical soils in northeast China

作　　者：汪太明[1,2,3] 王业耀[1,2] 香宝[2,3] 胡钰[2,3] 王金生[1] 

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]中国环境科学研究院,北京100012 [3]国家环境保护区域生态过程与功能评估重点实验室,北京100012

出　　处：《生态环境学报》2010年第12期2870-2874,共5页Ecology and Environmental Sciences

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07207-001);财政部改革启动专项(GGQD2008-04)

摘　　要：以受季节性冻融过程影响显著的东北地区的黑土、暗棕壤和水稻土为例,采用实验室模拟的方法,研究交替冻融循环过程(分别在-20℃和20℃下处理)对土壤腐殖质的影响。研究表明:交替冻融后,黑土和暗棕壤松结态腐殖质质量分数分别增加了39%和28%,HA/FA分别上升了45%和35%;水稻土松结态腐殖质质量分数和HA/FA分别下降了18%和31%。三维荧光结果进一步验证,黑土、暗棕壤在交替冻融中土壤芳香化程度增高,HA/FA上升,而水稻土则相反。黑土和暗棕壤松结态腐殖质和HA/FA升高,主要是微生物分解作用和土壤大团聚体破坏等原因造成,水稻土松结态腐殖质和HA/FA降低,主要是水稻土的缺氧环境造成。In order to study the effects of freeze-thaw cycles（FTCs） on the active humus（AH） and the ratio of humic acids to fulvic acids concentration（HA/FA） in black soil（BS）,dark brown soil（DS） and paddy field soil（PS）,indoor simulating experiments were carried out.The result showed,after FTCs treated by-20 ℃ to 20 ℃,AH and HA/FA increased 39% and 45% in BS sample.In DS samples,AH and HA/FA increased 28% and 35%.However,AH and HA/FA decreased 18% and 31% in PS sample.The result of EEM fluorescence spectra showed the molecular weight of humic substances in BS and DS samples increased.In contrast,the molecular weight of humic substances in PS samples decreased or changed little.During FTCs,soil organic matter was decomposed by microorganism,which could improve AH and HA/FA.The anoxic conditions was probably the reason why AH and HA/FA decreased in PS samples.

关 键 词：交替冻融 土壤 松结态腐殖质 胡敏酸/富里酸 三维荧光 

分 类 号：X144[环境科学与工程—环境科学]