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《BMJ (Clinical research ed.)》1961,2(5267):1653-1654,1655
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LYDIE CHAPUIS-LARDY NICOLE WRAGE† AURÉLIE METAY‡ JEAN-LUC CHOTTE§ MARTIAL BERNOUX§ 《Global Change Biology》2007,13(1):1-17
Soils are the main sources of the greenhouse gas nitrous oxide (N2 O). The N2 O emission at the soil surface is the result of production and consumption processes. So far, research has concentrated on net N2 O production. However, in the literature, there are numerous reports of net negative fluxes of N2 O, (i.e. fluxes from the atmosphere to the soil). Such fluxes are frequent and substantial and cannot simply be dismissed as experimental noise.
Net N2 O consumption has been measured under various conditions from the tropics to temperate areas, in natural and agricultural systems. Low mineral N and large moisture contents have sometimes been found to favour N2 O consumption. This fits in with denitrification as the responsible process, reducing N2 O to N2 . However, it has also been reported that nitrifiers consume N2 O in nitrifier denitrification. A contribution of various processes could explain the wide range of conditions found to allow N2 O consumption, ranging from low to high temperatures, wet to dry soils, and fertilized to unfertilized plots. Generally, conditions interfering with N2 O diffusion in the soil seem to enhance N2 O consumption. However, the factors regulating N2 O consumption are not yet well understood and merit further study.
Frequent literature reports of net N2 O consumption suggest that a soil sink could help account for the current imbalance in estimated global budgets of N2 O. Therefore, a systematic investigation into N2 O consumption is necessary. This should concentrate on the organisms, reactions, and environmental factors involved. 相似文献
Net N
Frequent literature reports of net N
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Kerry Barringer 《Brittonia》2004,56(3):213-237
Gibsoniothamnus L. O. Williams is a genus of 11 species native to Mexico, Central America, and northern Colombia. The species are shrubs
or small trees with opposite, entire leaves, tubular corollas, four stamens, 2-locular ovary, and fleshy, indehiscent fruits.
Calyces are unlobed, or they may have lateral, triangular or winglike lobes. Most species are epiphytes and appear to be bird
pollinated and bird dispersed. 相似文献
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