森林细根凋落物对农业土壤NH3和N2O损失的影响

IF 8 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Management Pub Date : 2025-02-01 Epub Date: 2025-01-11 DOI:10.1016/j.jenvman.2025.124099
Si Wu, Paramsothy Jeyakumar, Yuanyuan Feng, Haijun Sun, Yanfang Feng, Jiang Jiang, Weiming Shi
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引用次数: 0

摘要

在农田防护林系统中,森林细根凋落物的分解和/或凋亡会影响农田土壤在树-作物界面的性质,特别是土壤氮循环。然而,细根凋落物如何影响农田土壤氨(NH3)和氧化亚氮(N2O)的损失以及作物生产却知之甚少。采用全稻季土壤柱试验,研究了施氮量为0和240 kg hm -1的杨树(RP)和水杉(RM)对细根凋落物的响应动态。RP和RM对无N输入的土壤NH3和N2O排放影响最小。在240 kg N ha-1输入下,RP(含按产量比例计算的NH3挥发和排放因子)显著提高了37.1%,而RM(含240 kg N ha-1的水稻土)显著提高了22.7% -27.1%。N240 + RM的N2O排放减少主要是由于表层土壤铵态氮含量增加而硝态氮含量降低,表明季中排水阶段硝化速率降低。此外,土壤AOA amoA(-39.4%)和nirS(-23.7%)基因拷贝数的减少解释了RP对N2O排放的缓解作用。无论施不施氮,有细根凋落物处理与无细根凋落物处理的稻米产量差异无统计学意义,但与没有细根凋落物处理相比,RM使稻米产量降低了11.2-14.9%。综上所述,细根凋落物对N通过NH3和N2O排放的影响取决于N输入速率和细根类型。在有N输入的树-作物界面土壤中,RM同时通过NH3和N2O减少反应性农田土壤N损失。
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How does forest fine root litter affect the agricultural soil NH3 and N2O losses?

In farmland shelterbelt systems, the decomposition and/or apoptosis of forest fine root litter could affect farmland soil properties at the tree-crop interface, particularly the soil nitrogen (N) cycling. However, how fine root litter affect the ammonia (NH3) and nitrous oxide (N2O) losses from farmland soil and the crop production is little known. A soil column experiment covering a whole rice season was conducted to evaluate the dynamics aforesaid in response to fine root litter of Populus (RP) and Metasequoia glyptostroboides (RM) with 0 and 240 kg ha-1 N fertilizer input. Both RP and RM had minimal impact on NH3 and N2O emissions from soils without N input. At 240 kg N ha-1 input, RP significantly (p < 0.05) increased total NH3 volatilization (including yield-scaled NH3 volatilization and emission factor) by 37.1%, while RM significantly (p < 0.05) decreased it by 18.1%. Both fine root litter significantly (p < 0.05) reduced the N2O emissions from paddy soil receiving 240 kg N ha-1 by 22.7-27.1%. The reduction of N2O emission in N240 + RM was primarily attributed to higher topsoil ammonium-N but lower nitrate-N contents that indicating a reduced nitrification rate during the mid-season drainage stage. In addition, the decreases in soil AOA amoA (-39.4%) and nirS (-23.7%) gene copies explained the mitigating effect of RP on N2O emission. Regardless of N fertilizer application or not, there was no statistically significant difference in rice grain yield between treatments with and without fine root litter, although RM reduced grain yield by 11.2-14.9% compared to treatments without fine root litter. In conclusion, the impact of fine root litter on N emissions via NH3 and N2O depends on both N input rates and fine root types. RM simultaneously reduce reactive farmland soil N losses via NH3 and N2O in the tree-crop interface soils with N input.

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来源期刊
Journal of Environmental Management
Journal of Environmental Management 环境科学-环境科学
CiteScore
13.70
自引率
5.70%
发文量
2477
审稿时长
84 days
期刊介绍: The Journal of Environmental Management is a journal for the publication of peer reviewed, original research for all aspects of management and the managed use of the environment, both natural and man-made.Critical review articles are also welcome; submission of these is strongly encouraged.
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