Leaf Area in the Clearcut Site at Harvard Forest 2010-2012

This dataset contributed to an estimate of leaf area by species at the Prospect Hill clearcut regeneration site, used in a publication to attribute measured changes in gross primary productivity over time to either changes in species composition and associated traits versus changes in total leaf area. The file reports data on leaf area by species from destructive harvest in select plots. It also reports leaf area and leaf weight from destructive harvest of the foliage of select individual species to characterize the vertical distribution of foliage for those species. Corresponding measurements of total plant area recorded with a LAI-2000 before and after harvest of this foliage is reported as well, useful for inferring the leaf versus stem/branch portions of light interception as needed for improved estimates of LAI with the light-interception method. Lastly, below we report the result of an August 2012 site-level survey of plant area index measured with the LAI-2000 and converted to leaf area index.

本数据集支撑了普罗斯佩克特山皆伐更新样地的物种特异性叶面积估算研究，相关成果已发表于学术期刊，研究旨在将随时间推移测得的总初级生产力（gross primary productivity, GPP）实测变化归因于两类驱动因素：一是物种组成及其相关功能性状的改变，二是总叶面积的变化。

本数据集收录了通过对选定样地开展破坏性采伐所得到的各物种叶面积数据。为表征各选定物种的冠层垂直分布特征，数据集还包含了针对这些物种的冠层组织进行破坏性采伐后测得的叶面积与叶重量数据。此外，本数据集还记录了在采伐上述冠层组织前后，使用LAI-2000冠层分析仪（LAI-2000）测得的植株总冠层面积数据。此类数据可用于区分光照截获过程中的叶片占比与茎秆/枝条占比，从而借助光照截获法实现更精准的叶面积指数（Leaf Area Index, LAI）估算。

最后，本数据集还提供了2012年8月在该样地开展的LAI-2000实测植株冠层指数调查结果，并将其转换为叶面积指数。