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| Effects of organic fertilization on soil fertility and carbon pool of different plant species |
| Received:June 18, 2024 |
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| KeyWord:organic fertilization;land use type;soil property;soil fertility;organic carbon fraction |
| Author Name | Affiliation | E-mail | | ZHU Wenbin | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | ZHANG Hui | College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China | | | ZHANG Longjiang | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | SU Lianghu | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | OUYANG Shuang | Yingjing Ecological Environment Bureau of Ya'an City, Ya'an 625220, China | | | LIU Chenwei | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | lcw@nies.org | | WANG Lei | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | wlofrcc@126.com |
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| Abstract: |
| To investigate the effects of organic fertilization on soil fertility and organic carbon stocks under various land uses, this study focused on typical paddy fields, tea gardens, and vegetable plots in the Yangtze River Delta, assessing how organic fertilization influenced soil fertility and organic carbon fractions at different soil depths. Our results showed that fertilization predominantly affected the top 0-20 cm soil layer. Organic fertilization significantly enhanced available phosphorus and ammonium nitrogen in paddy soils and organic matter in tea garden soils compared to inorganic fertilization. Fertility evaluations using the Fuzzy method revealed that organic fertilization improved paddy soil fertility, while vegetable plots with combined organic and inorganic fertilization showed moderate fertility. The impact of organic fertilization on tea garden fertility was mixed. Specifically, the organic 1 treatment reduced NO3--N, Olsen-P, SOC, and TN at various depths, whereas the organic 3 treatment increased SOC and TN in the top layers. The critical factors constraining fertility in paddy fields and tea gardens were identified as available nitrogen, phosphorus, and organic matter, while pH was a key determinant for vegetable plots. Notably, organic matter, total nitrogen, and available nitrogen were the most influential factors for soil fertility in paddy fields, tea gardens, and vegetable plots. Organic fertilization also significantly boosted dissolved and mineral-bound organic carbon in the 0-20 cm layer across all land uses, with long-term organic application particularly enhancing mineral-bound organic carbon in tea gardens. In conclusion, organic fertilization benefits paddy soil fertility and carbon sequestration in paddy and tea garden soils, yet its effect on tea garden fertility requires further investigation. Combined organic and inorganic fertilization in vegetable plots poses a risk of soil acidification. Tailored strategies are essential for enhancing soil fertility and carbon stocks under different land uses. |
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