| Characteristics and coupling relationship of soil carbon and nitrogen transformation during in\|situ mineralization cultivation in Stipa baicalensis steppe |
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| DOI：10.7606/j.issn.1000-7601.2020.02.33 |
| Key Words: nitrogen addition in\|situ incubation carbon and nitrogen transformation coupling of carbon and nitrogen Stipa baicalensis steppe |
| Author Name | Affiliation | | LIU Hongmei | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China | | ZHANG Haifang | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China | | QIN Jie | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China | | ZHAO Jianning | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China | | WANG Hui | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China | | YANG Dianlin | Agro\|Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro\|Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro\|Environment and Agro\|Product Safety, Tianjin 300191, China |
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| Abstract: |
| This research was based on the long\|term simulated nitrogen deposition test platform in Stipa baicalensis steppe (began in 2010). The changes of soil carbon and nitrogen composition, net nitrification rate, net ammoniation rate, organic carbon conversion rate and coupling of soil carbon and nitrogen in Stipa baicalensis steppe under different nitrogen additions were studied by the in\|situ closed\|top PVC tube incubation methods. Test treatments included N0 (0 kg·hm-2·a-1), low\|N (15, 30, 50 kg·hm-2·a-1 was denoted as N15, N30, N50), and high-N (100, 150, 200, 300 kg·hm-2·a-1 was denoted as N100, N150, N200, N300).The results showed that during incubation time the net nitrification rate of N15, N30, N50, and N100 were significantly increased by 40.80%, 110.31%, 206.83% , and 202.04% than that of control N0 (P<0.05) , respectively. The net ammonification rate of N30, N50 , and N100 treatments were significantly decreased by 16.88%, 169.60% , and 150.67% than that of control N0 (P<0.05) , respectively. The net mineralization rate of N15 and N30 treatments were increased by 150% and 50% than that of control N0 , respectively. The net mineralization rate of N50, N100, N150 , and N200 treatments were decreased by 254.52%, 161.50%, 33.90% , and 79.85% than that of control N0 , respectively. There were significantly positive correlation between soil organic carbon and total nitrogen, dissolved carbon and dissolved nitrogen. There was a significantly negative correlation between microbial biomass carbon and microbial biomass nitrogen. The transformation rates of soil organic carbon had significant effects on the soil ammonification and microbial immobilization rates, and it can be well simulated by model of linear regression equation.Continuous high nitrogen deposition can reduce the soil net nitrogen mineralization rate and the organic carbon conversion rate, and have a negative impact on the soil carbon and nitrogen cycle. |
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