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| Effects of simulated acid rain and straw amendment on microbial respiration and enzyme activities of farmland soil |
| Received:October 26, 2020 |
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| KeyWord:farmland;soil microbial respiration;simulated acid rain;straw;enzyme activity;yellow brown soil |
| Author Name | Affiliation | E-mail | | ZHANG Xu | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China
School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | CHEN Shu-tao | School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | CHEN Gui-fa | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China | | | CAI Min | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China | | | ZHOU Li | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China | | | CUI Na-xin | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China | | | ZOU Guo-yan | Institute of Eco-Environmental Protection Research, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
Shanghai Engineering Research Center of Low-Carbon Agriculture, Shanghai 201415, China | zouguoyan@263.net |
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| Abstract: |
| In order to investigate the effects of simulated acid rain(SAR) and straw amendment on soil microbial respiration(SMR) and the enzyme activities of farmland, an indoor incubation experiment was performed. Four SAR treatments were set up with different pH values of 6.7, 4.0, 3.0, and 2.0. Furthermore, there were four straw amendment treatments for each SAR treatment. The dynamic changes of SMR were measured. The invertase activities, catalase activities, and pH of the soil for different treatments were also measured after the incubation experiment. The results showed that the pH values under the different SAR and straw amendment treatments were significantly (P<0.05) and linearly correlated with SMR. Two-way ANOVA showed that SAR and straw amendment significantly(P<0.001) influenced SMR, whereas these two factors had no significant combined impacts on SMR(P>0.05). The invertase and catalase activities were positively correlated with the amounts of the amended straw. A simple linear regression model could explain the relationship between SMR and catalase activity(P<0.001) and that between SMR and invertase activity(P=0.028). A binary linear regression model(P<0.001, R2=0.955) based on invertase and catalase activities was better able to explain the variations in SMR than the simple linear regression model. It can be concluded that short-term SAR reduced SMR and catalase activity, suggesting that short-term acid rain may inhibit the processes of soil matter cycling and has negative impacts on agroecosystems. |
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