摘要
对稳定运行的复合垂直流构建湿地中试系统基质进行分层采样,测定微生物数量,生物量氮,酶活性,硝化作用,反硝化作用以及呼吸作用等各项指标.结果表明,上行流和下行流池0～10cm的基质层中好氧微生物数量高出30～55cm的层面1～2个数量级;反硝化细菌除下行流池0～10cm的层面外其他基质层数量都达到107个/g干土以上.0～20cm的基质层中脲酶活性明显高于30～55cm的层面;而0～10cm的层面中脱氢酶活性明显高出10～55cm的层面2～5倍.硝化反硝化作用广泛存在于基质中,硝化作用表现出一定的空间规律,0～10cm的基质硝化作用强度要比40～55cm层面的高出20%;反硝化作用的空间差别很小,其作用率最低也达到85.5%.
Microorganism amounts, biomass nitrogen, enzyme activities, nitrification, denitrification, and respiration were measured in separate layer samples of the substrate of stablely operating plot scale of integrated vertical-flow constructed wetland. Aerobic microorganisms amount in 0~10cm substrate of up-flow and of down-flow ponds were higher with 1~2 magnitudes than that in 30~55cm substrate; the amounts of denitrification bacteria reached over 107/g (dry soil) except those of down-flow pond. Urease activities in 0~20cm substrate were obviously stronger than those in 30~55cm substrate; and dehydrogenase activities in 0~10cm substrate were 2~5 times of those in 10~55cm substrate.Nitrification-denitrification existed widely in the substrate, and nitrification showed definite spatial regulations:nitrification strength in 0~10cm substrate was higher with more than 20 percents than that in 40~55cm substrate; thespatial difference of denitrification was very little, with its lowest action rate still reaching 85.5%.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2003年第4期422-426,共5页
China Environmental Science
基金
国家杰出科学青年基金资助项目(39925007)
中国科学院知识创新工程重要方向性项目(KSCX2-SW-102)
关键词
构建湿地
微生物生物量氮
基质酶
硝化-反硝化作用
constructed wetland
microbial biomass nitrogen
substrate enzyme
nitrification-denitrification
