干旱区生态环境知识资源中心(Arid): 基于增强回归树的红壤旱坡花生地气态氮损失影响因素分析

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	基于增强回归树的红壤旱坡花生地气态氮损失影响因素分析
其他题名	Boosted Regression Tree-based Identification of Environmental Factors Influencing Gaseous Nitrogen Loss in Peanut Field on Red Soil Arid Hillside
	尤昆明; 刘士余; 聂小飞; 胡小丹; 郑海金
来源期刊	生态与农村环境学报
ISSN	1673-4831
出版年	2021
卷号	37 期号:5 页码:1673-4831
中文摘要	为探究红壤旱坡花生地气态氮(NH_3和N_2O)排放特征及其影响因素,采用通气法和密闭式静态暗箱-气相色谱法,原位监测翻耕和免耕条件下红壤旱坡花生地土壤NH_3挥发和N_2O排放的动态变化特征,并基于增强回归树(boosted regression tree,BRT)方法识别关键影响因子。结果表明:(1)整个花生生育期翻耕和免耕处理NH_3挥发速率(以N计)变化范围分别为0.02 ~ 1.55和0.02 ~ 1.05 kg·hm~(-2)·d~(-1),氨挥发累积量(以N计)分别为(17.198.56)和(18.387.41)kg·hm~(-2),占总施氮量的(11.775.86)%和(12.595.08)%,热点时段主要集中在施基肥后15 d内;翻耕和免耕处理N_2O排放通量(以N计)变化范围分别为0.07 ~ 2.90和0.02 ~ 3.97 mg·m~(-2)·d~(-1),累积量(以N计)分别为(0.810.27)和(0.680.10)kg·hm~(-2),占总施氮量的(0.550.17)%和(0.46 0.06)%,N_2O排放通量热点时段不明显;两种耕作条件下NH_3挥发无明显差异,但免耕降低了16.05%的N_2O排放累积量;氨挥发是红壤旱坡花生地氮素气态损失的主要途径。(2)采用增强回归树(BRT)分析发现,土壤铵态氮含量、施肥后天数、花生生育期、前3天降水量和土壤硝态氮含量是红壤旱坡花生地氨挥发的关键影响因子,贡献率分别为47.92%、14.78%、8.21%、7.44%和5.91%;而N_2O排放的关键影响因子分别为土壤含水量、土壤铵态氮含量、地温、前3天降水量、土壤硝态氮含量、施肥后天数和气温,相对贡献率分别为24.67%、20.34%、12.26%、 9.93%、9.91%、9.64%和8.51%。上述研究结果表明,施肥是影响红壤花生地氮肥气态氮损失的重要因子,气态氮(NH_3和N_2O)损失最高可占施肥量的18.35%,微生物硝化过程及其环境控制因子可能在土壤氮损失过程中发挥了重要作用。这些结果可为提高南方红壤区坡地氮肥利用率、减轻环境污染提供理论依据。
英文摘要	To clarify the characteristics and influencing factors of gaseous nitrogen(N_2O and NH_3)loss in peanut field on red soil arid hillside,aeration method and closed static opaque chamber-gas chromatography(GC)methods were adopted.In situ monitoring was carried out to reveal the dynamic change characteristics of NH_3 volatilization and N_2O emission of the peanut field on red soil arid hillside under conditions of plowing and no-tillage.Their key influencing factors were identified based on boosted regression tree(BRT)method.The results show that:(1)The variation range of NH_3 volatilization rate(measured in N)during the whole peanut growth period under plowing and no-tillage conditions was 0.02-1.55 and 0.02-1.05 kg·hm~(-2)·d~(-1),respectively,the cumulative volatilization was(17.198.56)and(18.38 7.41)kg·hm~(-2),respectively,accounted for(11.775.86)% and(12.595.08)% of the N application,respectively, and the NH_3 volatilization was concentrated within 15 d after base fertilizer application.The variation range of N_2O emission flux under plowing and no-tillage conditions was 0.07-2.90 and 0.02-3.97 mg·m~(-2)·d~(-1),respectively,the cumulative emission was(0.81 0.27)and(0.68 0.10)kg·hm~(-2),respectively,accounted for(0.55 0.17)% and(0.460.06)% of the N application,respectively,and the hot period of N_2O emission flux was not obvious.No significant difference in NH_3 volatilization between two tillage treatments were found,while no-tillage reduced cumulative N_2O emission by 16.05%.Ammonia volatilization was the main way of nitrogen gas loss in peanut field of red soil arid hillside.(2)The BRT analysis findings,soil ammonium-nitrogen content,days after fertilization,peanut growth period,rainfall in the previous 3 days,soil nitrate-nitrogen content were identified as the key factors affecting ammonia volatilization of the peanut filed on red soil arid hillside.The contribution rates were 47.92%,14.78%,8.21%,7.44% and 5.91%,respectively.However,the key influencing factors of N2 O emission and their relative contributions were soil moisture(24.67%),soil ammonium-nitrogen content(20.34%),ground temperature(12.26%),rainfall in the previous 3 days(9.93%),soil nitrate-nitrogen content(9.91%),days after fertilization(9.64%),and temperature(8.51%).The above results show that fertilization is an important factor affecting the gaseous loss of nitrogen fertilizer in peanut field of red soil,and the highest loss of gaseous nitrogen(NH_3 and N_2O)accounted for 18.35% of the N applied.Microbial nitrification process and its environmental control factors may play an important role in soil nitrogen loss.These results could provide a theoretical basis for improving nitrogen utilization rate and mitigating environmental pollution in hillside agriculture in red soil region of South China.
中文关键词	红壤 ; 旱坡地 ; 花生地 ; N_2O排放 ; NH_3挥发 ; 增强回归树
英文关键词	red soil arid hillside peanut field N_2O emission NH_3 volatilization boosted regression tree(BRT)
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Agriculture
CSCD记录号	CSCD:6989838
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/365269
作者单位	尤昆明, 江西农业大学国土资源与环境学院;;江西省鄱阳湖流域农业资源与生态重点实验室;;江西省水土保持科学研究院;;江西省土壤侵蚀与防治重点实验室, ;;江西省鄱阳湖流域农业资源与生态重点实验室;;;;江西省土壤侵蚀与防治重点实验室, 南昌;;南昌;;南昌;;南昌, 江西;;江西;;江西;;江西 330045;;330045;;330029;;330029, 中国.; 刘士余, 江西农业大学国土资源与环境学院;;江西省鄱阳湖流域农业资源与生态重点实验室, ;;江西省鄱阳湖流域农业资源与生态重点实验室, 南昌;;南昌, 江西;;江西 330045;;330045, 中国.; 聂小飞, 江西省水土保持科学研究院;;江西省土壤侵蚀与防治重点实验室, ;;江西省土壤侵蚀与防治重点实验室, 南昌;;南昌, 江西;;江西 330029;;330029, 中国.; 郑海金, 江西省水土保持科学研究院;;江西省土壤侵蚀与防治重点实验室, ;;江西省土壤侵蚀与防治重点实验室, 南昌;;南昌, 江西;;江西 330029;;330029, 中国.; 胡小丹, 江西农业大学国土资源与环境学院;;江西省鄱阳湖流域农业资源与生态重点实验室;;江西省水土保持科学研究院;;江西省土壤侵蚀与防治重点实验室;;九江市第七中学, ;;江西省鄱阳湖流域农业资源与生态重点实验室;;;;江西省土壤侵蚀与防治重点实验室;;, 南昌;;南昌;;南昌;;南昌;;九江, 江西;;江西;;江西;;江西;;江西 330045;;330045;;330029;;330029;;332000, 中国.
推荐引用方式 GB/T 7714	尤昆明,刘士余,聂小飞,等. 基于增强回归树的红壤旱坡花生地气态氮损失影响因素分析[J],2021,37(5):1673-4831.
APA	尤昆明,刘士余,聂小飞,胡小丹,&郑海金.(2021).基于增强回归树的红壤旱坡花生地气态氮损失影响因素分析.生态与农村环境学报,37(5),1673-4831.
MLA	尤昆明,et al."基于增强回归树的红壤旱坡花生地气态氮损失影响因素分析".生态与农村环境学报 37.5(2021):1673-4831.