Nitrogen cycling at treeline. II. Percent Soil Carbon and Nitrogen

We studied spatial and temporal patterns of nitrogen pools and fluxes in soils at treeline and forested sites within three mountain ranges across a 785 km transect in Alaska during 2001- 2002. We measured pools of soil mineral (ammonium and nitrate) and organic (amino acid and microbial biomass) nitrogen, in situ rates of net mineralization, net nitrification, net amino acid production, and decomposition, as well as soil carbon turnover in a laboratory incubation experiment. A complete characterization of the study can be found in Loomis et al. (2006).本研究于2001—2002年间，针对阿拉斯加境内横跨785公里样带的三个山脉内的林线（treeline）与森林样地土壤，探究了其氮库（nitrogen pools）与通量（fluxes）的时空格局。本研究测定了土壤矿质氮（含铵态氮与硝态氮）及有机氮（含氨基酸与微生物生物量氮）的库储量，原位净矿化速率、净硝化速率、净氨基酸生成速率与土壤分解速率，并通过室内培养试验测定了土壤碳周转（soil carbon turnover）情况。本研究的完整概况可参见Loomis等（2006）的研究成果。