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| Soil organic carbon and nitrogen and carbon pool management index in Loess soil as influenced by biochar |
| Received:September 16, 2015 |
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| KeyWord:biochar;carbon sequestration and emission cut;water-soluble organic carbon;carbon pool management index(CPMI) |
| Author Name | Affiliation | E-mail | | WANG Yue-ling | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | | | GENG Zeng-chao | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | gengzengchao@126.com | | SHANG Jie | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | | | CAO Sheng-lei | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | | | GENG Rong | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | | | ZHAO Jun | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | | | LIN Yun | College of Natural Resources and Environment, Northwest A & F University, Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, Yangling Shaanxi, 712100, China | |
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| Abstract: |
| In recent years biochar has received widespread attention in soil improvement, pollution reduction, and carbon sequestration both at home and abroad. Total soil organic carbon(TSOC), total nitrogen(TN), pH, soil active organic carbon(AOC), moderately active organic carbon(MAOC), highly active organic carbon(HAOC), water-soluble organic carbon(WSOC), and carbon pool management index(CPMI)were investigated in a 2 year plot trial. Results showed that TSOC, TN and pH increased respectively by 59.80%~180.52%, 13.22%~20.92% and 0.76%~1.28% in a dose-effect manner after the fourth harvesting of crops, while HAOC and CPMI increased by 70.36% and 52.43% at biochar rate of 60 t·hm-2 than in the control. AOC reached the maximum after the second season at 40 t·hm-2 of biochar, but it was the highest in the third and forth seasons at 60 t·hm-2 of biochar. During the experimental period, AOC was increased by 18.46%73.42%, as compared with the control. During the first three quarters, WSOC was 8.00%~42.77% lower in biochar than in the control. There were significant correlation between all indexes and biochar rate(P<0.05), with an exception of MAOC. These findings indicate that applying biochar increases total soil organic carbon and total nitrogen as well as carbon pool management index, and also improves soil quality and soil fertility. |
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