交替冻融对东北典型土壤浸提液碳氮污染指标的影响  

Effects of Freeze-Thaw Cycles on C and N Indices in Extracts of Typical Soil Samples from Northeastern 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：《环境科学研究》2011年第10期1149-1153,共5页Research of Environmental Sciences

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07207-001)

摘　　要：以黑土、暗棕壤和水稻土为例,试验研究了交替冻融对土壤溶解性污染物的影响.结果表明,15次交替冻融后(在-20和20℃进行冻融处理),黑土浸提液的ρ(CODCr)下降了36%,水稻土浸提液上升了8%,暗棕壤浸提液未出现明显变化;黑土浸提液的ρ(NH4+-N)下降了22%,水稻土浸提液上升了84%,暗棕壤浸提液未出现明显变化;黑土和暗棕壤浸提液的ρ(NO3--N)分别上升了1.3和1.1倍,而水稻土未出现明显变化.土壤浸提液ρ(CODCr),ρ(NH4+-N)和ρ(NO3--N)的变化主要取决于土壤含氧水平,有氧条件下浸提液的ρ(CODCr)和ρ(NH4+-N)降低而ρ(NO3--N)升高,缺氧条件下则相反.土壤浸提液的ρ(TN)主要取决于土壤C/N,冻融后黑土、暗棕壤和水稻土浸提液的ρ(TN)分别上升了30%,35%和39%.The effects of freeze-thaw cycles（FTCs） on the soluble contaminants in black soil（BS）,dark brown soil（DS） and paddy field soil（PS） were investigated.The results showed that,after 15 FTCs treated between-20 ℃ and 20 ℃,the CODCr mass concentration in the extract of BS samples decreased by 36%;the CODCr in the extract of PS samples increased by 8%;and,the CODCr in the extract of DS samples showed no obvious change.The NH4＋-N in the extract of BS samples decreased by 22%;the NH4＋-N in the extract of PS samples increased by 84%;and,the NH4＋-N in the extract of DS samples showed no obvious change.The NO3——N in the extracts of BS and DS samples increased by 130% and 110% respectively.In contrast,the NO3——N in the extract of PS samples showed no obvious change.The amount of oxygen included was a key factor determining the increase or decrease of CODCr,NH4＋-N and NO3——N mass concentrations in the extracts of the soil samples.CODCr and NH4＋-N mass concentrations would probably decrease in the presence of oxygen,while NO3——N mass concentration would increase in anoxic conditions,and vice versa.The mass concentration of TN in the extracts was mainly determined by the C/N ratio in the soil.In this research,the TN in the extracts of BS,DS and PS samples increased by 30%,35% and 39% respectively.

关 键 词：交替冻融 土壤浸提液 污染指标 碳 氮 

分 类 号：X144[环境科学与工程—环境科学]