Net N mineralization in the MELNHE study at Hubbard Brook Experimental Forest, Bartlett Experimental Forest and Jeffers Brook, central NH USA, 2008 - present

The Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE) project studies N and P acquisition and limitation through a series of nutrient manipulations in northern hardwood forests. This data set includes net N mineralization measured in Oe, Oa, and mineral soil horizons in all 13 of the MELNHE study sites. Samples are collected every several years, beginning with pretreatment (2008 and 2009) through 2014, representing 3 years of N and P fertilization.北方硬木生态系统多元素限制（Multiple Element Limitation in Northern Hardwood Ecosystems, MELNHE）项目通过在北方硬木林中开展一系列养分操控实验，旨在探究氮（N）与磷（P）的获取过程及其限制效应。本数据集涵盖MELNHE全部13个研究样地中，于Oe层、Oa层及矿质土壤层（mineral soil horizons）内测得的净氮矿化量数据。样本采集每隔数年进行一次，时间跨度始于预处理阶段（2008年与2009年）直至2014年，该时段对应为期3年的氮磷施肥处理周期。