Soil nitrous oxide and methane data for South slope of Niwot Ridge, 1992.

To determine the effect of increased nitrogen availability on fluxes of N2O and CH4 from alpine soils, we measured fluxes of these gases from fertilized and unfertilized soils in two alpine plant communities differing in net primary productivity, soil organic matter quality, and moisture. Five fertilized and 5 unfertilized plots within each community type were sampled. In the dry meadow community, the addition of nitrogen resulted in a 22-fold increase in N2O emission, while in the wet meadow, we observed a 45-fold increase in N2O emission rates. Methane uptake in the dry meadow community was reduced 52% by fertilization. However, net CH4 production occurred in all of the wet meadow plots and emission rates were not significantly affected by fertilization. Net nitrification rates were higher in dry meadow fertilized plots than in non-fertilized plots throughout the growing season. Net mineralization rates in fertilized dry meadow plots were higher than those in non-fertilized plots during the latter half of the growing season. Carbon to nitrogen ratios and amounts of total soil organic nitrogen in both the wet and dry meadow were not significantly affected by fertilization.为探明氮素有效性提升对高山土壤氧化亚氮（N₂O）与甲烷（CH₄）通量的影响，本研究针对两种在净初级生产力、土壤有机质质量及含水量存在差异的高山植物群落，分别测定了施肥与未施肥土壤中上述气体的通量。每种群落类型内各设置5个施肥样地与5个未施肥样地开展采样。干草甸群落中，施氮使氧化亚氮排放提升22倍；而在湿草甸群落中，氧化亚氮排放速率提升达45倍。干草甸群落的甲烷吸收能力经施肥处理后降低了52%。但所有湿草甸样地均出现甲烷净产生现象，且施肥对其排放速率无显著影响。在整个生长季内，干草甸施肥样地的净硝化速率均高于未施肥样地。生长季后半段，施肥干草甸样地的净矿化速率显著高于未施肥样地。湿草甸与干草甸的碳氮比及土壤总有机氮含量均未因施肥处理产生显著变化。