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Volume 15 Issue 4
Jul.  2024
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ZHANG Bofei, XIAO Yulin, ZHANG Chong, JU Xiaotang. Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan[J]. Journal of Tropical Biology, 2024, 15(4): 391-399. doi: 10.15886/j.cnki.rdswxb.20240030
Citation: ZHANG Bofei, XIAO Yulin, ZHANG Chong, JU Xiaotang. Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan[J]. Journal of Tropical Biology, 2024, 15(4): 391-399. doi: 10.15886/j.cnki.rdswxb.20240030

Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan

doi: 10.15886/j.cnki.rdswxb.20240030
  • Received Date: 2024-02-24
  • Rev Recd Date: 2024-03-12
  • Publish Date: 2024-07-25
  • This study aims to quantify the nitrogen (N) input and output of Hainan’s tropical vegetable and orchard cropping systems,establish N surplus indicators,and evaluate the environmental impacts.We collected 34 papers published in Hainan since 1980,including 72 samples of conventional and optimized N management of vegetables and orchards.The N inputs,outputs,and surpluses under conventional and optimized N management were analyzed based on the soil surface nitrogen balance method,and the N surplus under the optimized management was used as the N surplus benchmark.The life cycle assessment method (LCA) was used to quantify reactive N losses,greenhouse gas emissions,carbon and N footprints under conventional and optimized N management.Under conventional N management,the N surpluses were 290 kg·hm-2 in vegetables and 432 kg·hm-2 in orchards,respectively,the corresponding N surplus benchmarks under optimized N management were reduced by 39%and 49%,which were 176 and 222 kg·hm-2,respectively.The reactive N emission,N footprint,greenhouse gas emissions(CO2-eq),and carbon footprint(CO2-eq) under conventional N management of vegetables were 145 kg·hm-2,4.5 kg·t-1,9 444 kg hm-2 and 295 kg·t-1,respectively;under optimized N management,the above indicators were reduced by 26%,24%,19%and 19%,respectively.The active N emission,N footprint,greenhouse gas emission,and carbon footprint under conventional N management of orchards were 177 kg·hm-2,4.5 kg·t-1,14 758 kg·hm-2 and 388 kg·eq t-1,respectively;Optimizing N management can reduce the above indicators by 28%,33%,21%and 26%,respectively.In conclusion,the N surplus benchmarks of Hainan’s typical vegetable and orchard systems were 176 and 222 kg·hm-2,respectively,using optimized N management (such as"4R Plus"nutrient management strategy,soil acid modification and organic carbon improvement,fertigation,etc.) can achieve the above N surplus benchmarks,and the current reactive N emissions,N footprint,greenhouse gas emissions,and carbon footprints can be reduced by 19%-33%.
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Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan

doi: 10.15886/j.cnki.rdswxb.20240030

Abstract: This study aims to quantify the nitrogen (N) input and output of Hainan’s tropical vegetable and orchard cropping systems,establish N surplus indicators,and evaluate the environmental impacts.We collected 34 papers published in Hainan since 1980,including 72 samples of conventional and optimized N management of vegetables and orchards.The N inputs,outputs,and surpluses under conventional and optimized N management were analyzed based on the soil surface nitrogen balance method,and the N surplus under the optimized management was used as the N surplus benchmark.The life cycle assessment method (LCA) was used to quantify reactive N losses,greenhouse gas emissions,carbon and N footprints under conventional and optimized N management.Under conventional N management,the N surpluses were 290 kg·hm-2 in vegetables and 432 kg·hm-2 in orchards,respectively,the corresponding N surplus benchmarks under optimized N management were reduced by 39%and 49%,which were 176 and 222 kg·hm-2,respectively.The reactive N emission,N footprint,greenhouse gas emissions(CO2-eq),and carbon footprint(CO2-eq) under conventional N management of vegetables were 145 kg·hm-2,4.5 kg·t-1,9 444 kg hm-2 and 295 kg·t-1,respectively;under optimized N management,the above indicators were reduced by 26%,24%,19%and 19%,respectively.The active N emission,N footprint,greenhouse gas emission,and carbon footprint under conventional N management of orchards were 177 kg·hm-2,4.5 kg·t-1,14 758 kg·hm-2 and 388 kg·eq t-1,respectively;Optimizing N management can reduce the above indicators by 28%,33%,21%and 26%,respectively.In conclusion,the N surplus benchmarks of Hainan’s typical vegetable and orchard systems were 176 and 222 kg·hm-2,respectively,using optimized N management (such as"4R Plus"nutrient management strategy,soil acid modification and organic carbon improvement,fertigation,etc.) can achieve the above N surplus benchmarks,and the current reactive N emissions,N footprint,greenhouse gas emissions,and carbon footprints can be reduced by 19%-33%.

ZHANG Bofei, XIAO Yulin, ZHANG Chong, JU Xiaotang. Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan[J]. Journal of Tropical Biology, 2024, 15(4): 391-399. doi: 10.15886/j.cnki.rdswxb.20240030
Citation: ZHANG Bofei, XIAO Yulin, ZHANG Chong, JU Xiaotang. Establishment of Nitrogen surplus indicators in the main vegetable and orchard systems in Hainan[J]. Journal of Tropical Biology, 2024, 15(4): 391-399. doi: 10.15886/j.cnki.rdswxb.20240030
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