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| Effects of extreme warming and rainfall on carbon and nitrogen nutrients status and enzyme activities in tea garden soils with different planting ages |
| Received:October 10, 2016 |
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| KeyWord:tea orchards;cultivation age;soil nutrients;extracellular enzyme;extreme climate |
| Author Name | Affiliation | E-mail | | LI Hui | Institute of Environmental Protection, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China | | | ZHAO Xing | Institute of Environmental Protection, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China | | | YANG Jing-ping | Institute of Environmental Protection, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China | jpyang@zju.edu.cn | | ZHONG Yi-ming | Institute of Environmental Protection, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China | | | WANG Xiao-peng | Institute of Environmental Protection, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China | |
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| Abstract: |
| In this paper, we investigate the effects of high temperature and rainfall on soil carbon and nitrogen variations and enzyme activities, by conducting experiments on different tea soils at cultivation ages of 0, 10, 30, and 50 years. The result indicated that under 35℃ treatment condition, the soil total organic carbon, ammonium nitrogen, nitrate nitrogen, microbial carbon contents, and the activity of extracellular enzymes related to soil carbon decreased while the extracellular enzymes related to soil nitrogen increased. 40℃ treatment can significantly reduce the content of carbon and nitrogen in soil and the activity of extracellular enzymes related to carbon and nitrogen of soil. Afterwards, the following simulated rainfall presented a positive effect on the recovery of soil microbial biomass carbon and extracellular enzyme activity, but there was no significant effect on other nutrient indexes. Above all, the tea soil under cultivation age 30 years exhibited higher nutrient content of carbon, nitrogen and enzyme activity, meaning that the soil ecosystem stability and the resistance ability to extreme high temperature and rainfall variation are better than other soil cultivation ages. |
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