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Int. J. Environ. Res. Public Health 2017, 14(9), 968; https://doi.org/10.3390/ijerph14090968

Responses of Biogeochemical Characteristics and Enzyme Activities in Sediment to Climate Warming under a Simulation Experiment in Geographically Isolated Wetlands of the Hulunbuir Grassland, China

1
Research Center for Grassland Ecology and Resources, Beijing Forestry University, Beijing 100083, China
2
State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences (CRAES), Beijing 100012, China
3
Hui River National Nature Reserve Administration of Inner Mongolia, Hailar 021100, Inner Mongolia, China
*
Author to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 18 August 2017 / Accepted: 25 August 2017 / Published: 27 August 2017
(This article belongs to the Section Environmental Science and Engineering)
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Abstract

Climate warming generates a tremendous threat to the stability of geographically-isolated wetland (GIW) ecosystems and changes the type of evaporation and atmospheric precipitation in a region. The intrinsic balance of biogeochemical processes and enzyme activity in GIWs may be altered as well. In this paper, we sampled three types of GIWs exhibiting different kinds of flooding periods. With the participation of real-time temperature regulation measures, we assembled a computer-mediated wetland warming micro-system in June 2016 to simulate climate situation of ambient temperature (control group) and two experimental temperature differences (+2.5 °C and +5.0 °C) following a scientific climate change circumstance based on daily and monthly temperature monitoring at a two-minutes scale. Our results demonstrate that the contents of the total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in the warmed showed, roughly, a balance or a slight decrease than the control treatment. Warming obstructed the natural subsidence of sediment, but reinforced the character of the ecological source, and reduced the activity of urease (URE), but promoted the activity of alkaline phosphatase (AKP) and sucrase (SUC). Redundancy analysis showed that sucrase, urease, available phosphorus (AP), and pH were the major correlating factors under warming conditions in our research scope. Total organic carbon, total nitrogen, sucrase, catalase (CAT), and alkaline phosphatase were the principal reference factors to reflect the ambient temperature variations. Nutrient compositions and enzyme activities in GIW ecosystems could be reconstructed under the warming influence. View Full-Text
Keywords: geographically-isolated wetland; climate warming; biogeochemical characteristic; enzyme activity; sediment geographically-isolated wetland; climate warming; biogeochemical characteristic; enzyme activity; sediment
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Han, L.; Su, D.; Lv, S.; Luo, Y.; Li, X.; Jiao, J.; Diao, Z.; Bu, H. Responses of Biogeochemical Characteristics and Enzyme Activities in Sediment to Climate Warming under a Simulation Experiment in Geographically Isolated Wetlands of the Hulunbuir Grassland, China. Int. J. Environ. Res. Public Health 2017, 14, 968.

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