Microbial enzymatic response to catchment‐scale variations in supply of dissolved organic carbon
作者:
Stuart Findlay,
ChristopherW. Hickey,
JohnM. Quinn,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1997)
卷期:
Volume 31,
issue 5
页码: 701-706
ISSN:0028-8330
年代: 1997
DOI:10.1080/00288330.1997.9516800
出版商: Taylor & Francis Group
关键词: microbes;bacteria;land use;epilithon;enzymes
数据来源: Taylor
摘要:
A suite of exoenzyme activities was assayed in three New Zealand streams draining pasture, native forest, and a pine catchment. There were differences among catchments in activity of three of the five enzymes assayed (cello‐biohydrolase, N‐acetylglucosaminidase, and dihydroxylphenylalanine oxidation). A principal components analysis (PCA) demonstrates that patterns of enzyme activity can be used to separate the three stream types. An experimental addition of algal‐leachate, leaf‐litter leachate, and high dissolved organic carbon (DOC) water from a small seep also resulted in marked shifts in epilithic enzyme activities 1 day after DOC additions. Oxidative enzymes showed a particularly strong response to additions of humic DOC. As for the field samples, a PCA showed large differences among treatments indicating that exoenzyme patterns can be used to examine which DOC sources predominate in different streams. Application of this approach to describing differences among streams will require detailed seasonal sampling together with longer‐term experiments.
点击下载:
PDF (472KB)
返 回