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Influence of biological nitrification inhibition by forest tree species on soil denitrifiers and N2O emissions
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2021-02-04 , DOI: 10.1016/j.soilbio.2021.108164
A. Florio , M. Marechal , A. Legout , C. Creuse des Chatelliers , J. Gervaix , S. Didier , B. Zeller , X. Le Roux

Some forest tree species are able to carry out a process known as biological nitrification inhibition, BNI, i.e. they inhibit nitrifiers through the production of specific compounds. We tested the hypothesis that, by restricting N supply to NO2- and N2O-reducers, BNI would decrease potential N2O production and consumption and in situ N2O emissions. as compared to soils under trees without BNI capacity. Soils were collected from long-term monocultures (>43 ys) of three tree species without BNI capacity (Fagus sylvatica, Pinus nigra and Pseudotsuga menziesii) and two tree species with BNI capacity (Abies nordmanniana and Picea abies). The level of limitation of denitrification by NO3 was high for species with BNI capacity and low for species without BNI capacity, and was correlated with potential nitrification rates and the abundances of genes specifically harboured by ammonia oxidizing archaea and Nitrobacter. However, potential denitrification and actual N2O emissions did not reflect the tree BNI status, and denitrification limitation by soil carbon was higher than limitation by N under three tree species. Structural equation modelling revealed that the ratio between the gene copy abundances of nitrite-reducers and N2O-reducers was the microbial variable that best explained N2O emissions, along with soil pH and moisture. In addition, the NO3 concentration in the soil solution at 60 cm depth increased with the potential nitrification-to-denitrification ratio, suggesting a higher risk of NO3 leaching under some tree species like Douglas fir.



中文翻译:

林木种对生物硝化的抑制作用对土壤反硝化剂和N 2 O排放的影响

一些林木物种能够进行称为生物硝化抑制的过程,即BNI,即它们通过生产特定化合物来抑制硝化剂。我们测试的假设,通过限制NO供氮2 - -和N 2 O型减速机,BNI将减少潜在的N 2 Ø生产和消费,并在原地ñ 2 O排放。与没有BNI能力的树木下的土壤相比。土壤从三个树种长期单一培养(> 43个YS)收集无BNI容量(水青冈黑松花旗松)和两个树种BNI容量(冷杉(Abies nordmanniana)云杉(Picea abies)。通过NO脱氮的限制的电平3 -是高与BNI容量和低不为BNI容量物种的物种,和与由氨氧化古细菌和具体窝藏潜在硝化速率和基因的丰度呈正相关硝化。然而,潜在的反硝化作用和实际的N 2 O排放量并不能反映树木的BNI状态,在三种树种下,土壤碳的反硝化限制高于氮的限制。结构方程建模表明,亚硝酸盐还原剂的基因拷贝丰度与N 2之间的比率O减少剂是最能解释N 2 O排放以及土壤pH和水分的微生物变量。另外,NO 3 -在60厘米深土壤溶液浓度与电位硝化到脱氮率升高,提示NO的更高的风险3 -在某些树种等道格拉斯冷杉浸出。

更新日期:2021-02-10
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