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| Estimation of vegetable fields bearing capacity of animal manure targeting groundwater leaching risk mitigation |
| Received:May 20, 2025 |
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| KeyWord:animal manure;bearing capacity;vegetable field;nitrogen;leaching |
| Author Name | Affiliation | E-mail | | CHU Tianshu | State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | REN Yizhe | College of Engineering, China Agricultural University, Beijing 100083, China | | | YANG Yuchen | College of Engineering, China Agricultural University, Beijing 100083, China | | | DAI Ziyang | College of Veterinary Medicine, Northwest A&F University, Yangling 712199, China | | | HONG Shiteng | College of Engineering, China Agricultural University, Beijing 100083, China | | | CHEN Chenchen | College of Engineering, China Agricultural University, Beijing 100083, China | | | HE Xueni | College of Engineering, China Agricultural University, Beijing 100083, China | | | ZHANG Xuejian | College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China | | | SHI Jiaqi | State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China | | | FAN Tingting | State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China | bluebird3602@126.com |
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| Abstract: |
| To achieve regional integration of planting and breeding and groundwater leaching risk mitigation, vegetable fields in 47 prefecture-level cities in north China were selected as research objects, and a vegetable field nitrogen leaching model was developed using support vector machine algorithms to estimate the vegetable field bearing capacity of animal manure targeting groundwater leaching risk mitigation. A scenario-based framework was established to simulate vegetable field bearing capacity across different cities under varying nitrogen leaching thresholds. Results showed that the nitrogen leaching model exhibited a determination coefficient（R2）of 0.72. Nitrogen leaching in vegetable fields increased with growing applications of inorganic fertilizer and manure. Regionally, inorganic fertilizer dominated in 22 cities; manure in 2 cities; and both jointly in 23 cities. Under nitrogen leaching thresholds of 11.3 kg·hm-2, the estimated vegetable field bearing capacity across 47 cities in north China ranged from 0 to 234.5 heads per hectare（expressed in pig equivalent）, 41 exhibited lower capacity than that based on vegetable nitrogen demand requirements, nitrogen leaching constrained potential for manure application and breeding development in north China. |
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