Currie WS
Trends Ecol Evol. 1999 Aug;14(8):316-320. doi: 10.1016/s0169-5347(99)01645-6.
Soil organic matter is often viewed as comprising large pools of carbon and nitrogen with long residence times. However, the organic horizon that lies on the soil surface in temperate forests is a dynamic component of ecosystem carbon and nitrogen cycling. Responses to elevated inputs of nitrogen in this organic layer are emerging as key facets of ecosystem retention or loss of dissolved nitrogen. Research along nitrogen deposition gradients in the USA and Europe reveals a link between the ratio of organic carbon:nitrogen in the forest floor and nitrogen turnover rates, nitrification and leaching losses. Characteristics and processes in the forest floor are now recognized as key indicators or determinants of ecosystem 'nitrogen status'.
土壤有机质通常被视为包含大量具有长停留时间的碳和氮库。然而，温带森林土壤表面的有机层是生态系统碳和氮循环的一个动态组成部分。该有机层对增加的氮输入的响应正成为生态系统对溶解态氮保持或损失的关键方面。在美国和欧洲沿着氮沉降梯度开展的研究揭示了林地中有机碳与氮的比例与氮周转率、硝化作用及淋溶损失之间的联系。现在人们认识到林地的特征和过程是生态系统“氮状况”的关键指标或决定因素。
