Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Litterfall mass 2009-2022

This dataset describes litterfall mass collected in the Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE) study in New Hampshire from fall 2009 through summer 2022. Litter was collected three times per year: fall (late October or early November), spring (June), and summer (August). Fall litter was sorted by species in a subset of stands. This data package also includes the R code used to impute missing data for analysis, a manually edited data file used in the R code flow, and a file matching the labels for litterfall collectors from the original (pre Fall 2011) and current (Fall 2011 and onwards) labeling systems. All collectors have the most current label if known for all years of data.

Additional detail on MELNHE, including a table of stand descriptions, project description, and a diagram of plot configuration can be found in this data package:

Yanai, R.D., M. Fisk, and T.J. Fahey. 2024. Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Project description, plot characteristics and design ver 2. Environmental Data Initiative. https://doi.org/10.6073/pasta/6cc8a39d052834c030650fb29937bf4f (Accessed 2024-10-17).

Litterfall chemistry data for a subset of these samples can be found in the following data package:

Fisk, M.C., R.D. Yanai, S.D. Hong, C.R. See, and S. Goswami. 2022. Litter chemistry and masses for the MELNHE NxP fertilization experiment ver 1. Environmental Data Initiative. https://doi.org/10.6073/pasta/8b2975a3a02cbcfb1b0a12ac954576d4 (Accessed 2024-06-09).

These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.

本数据集描述了2009年秋季至2022年夏季期间，在新罕布什尔州北部硬木生态系统多元素限制研究（Multiple Element Limitation in Northern Hardwood Ecosystems, MELNHE）中收集的凋落物质量数据。

凋落物每年收集三次：秋季（10月末或11月初）、春季（6月）和夏季（8月）。部分林分的秋季凋落物按物种进行分类。

本数据包还包含用于分析时插补缺失数据的R代码、R代码流程中使用的人工编辑数据文件，以及匹配凋落物收集器标签的文件——涵盖2011年秋季前的原始标签系统与2011年秋季及以后的现行标签系统。所有收集器（若已知）在所有年份的数据中均使用最新标签。

关于MELNHE的更多细节（包括林分描述表、项目说明及样地配置图）可在以下数据包中获取：
Yanai, R.D., M. Fisk, and T.J. Fahey. 2024. Multiple Element Limitation in Northern Hardwood Ecosystems (MELNHE): Project description, plot characteristics and design ver 2. Environmental Data Initiative. https://doi.org/10.6073/pasta/6cc8a39d052834c030650fb29937bf4f（访问日期：2024-10-17）。

部分样本的凋落物化学数据可在以下数据包中获取：
Fisk, M.C., R.D. Yanai, S.D. Hong, C.R. See, and S. Goswami. 2022. Litter chemistry and masses for the MELNHE NxP fertilization experiment ver 1. Environmental Data Initiative. https://doi.org/10.6073/pasta/8b2975a3a02cbcfb1b0a12ac954576d4（访问日期：2024-06-09）。

这些数据是哈伯德布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的一部分。HBES是在哈伯德布鲁克实验林开展的合作项目，该实验林由美国农业部林务局北部研究站运营和维护。