期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 671, 期 -, 页码 157-164出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.03.374
关键词
Carbon degrading enzyme; Cd addition; Elevated CO2; N deposition
资金
- National Natural Science Foundation of China [31570483, 31870464]
- Natural Science Foundation of Guangdong Province [2015A030311029]
- Science & Technology Program of Guangzhou [201803030020]
Rising atmospheric CO2 concentration and nitrogen (N) deposition are changing terrestrial carbon (C) cycle; however, little has been known about such impacts in a heavy-metal-contaminated environment. This study conducted an open-top chamber experiment to explore the impacts of rising atmospheric CO2 concentration and N deposition on the leaf litter and soil C cycle in cadmium (Cd)-contaminated environment. The experiment include five treatments: control, Cd (30 g ha(-1) yr(-1)) addition, Cd addition under elevated CO2 (700 ppm CO2), Cd and N(100 kg ha(-1) yr(-1)) additions, and Cd and N additions under elevated CO2, with three replicates per treatment. Leaf litter and soil C cycle were indexed by microbial biomass C concentration and the activities of four key C-degrading enzyme (beta-glucosidase (BG), cellobiohydrolase (CBH), polyphenol oxidase (PPO), and peroxidase (POD)) in litter and soil. Results showed that, after one year treatment, Cd addition negatively affected the activities of all four C-degrading enzyme in litter and soil; while elevated CO2 and N addition essentially alleviated these negative effects. Elevated CO2 and N addition increased C-degrading enzyme activities more of the non-legume (i.e., Cinnamomum camphora) litter than those of the legume (i.e., Acacia auriculiformis) litter. Elevated CO2, N addition, and Cd addition all affected C-degrading enzyme activities via their effects on the microbial biomass C concentration and C and N availability of the litter and soil samples. We suggest that rising atmospheric CO2 concentration and N deposition can offset the detrimental effect of Cd on the litter and soil C-degrading enzyme activities in forest ecosystems. Published by Elsevier B.V.
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