Understory Herbaceous Cover

In addition to collecting presence/absence of herbaceous species at each plot, beginning in 2012 abundance measure (percent cover). A 5m^2 PVC square was placed on the perimeter or each plot, then all plants whose stem originated in the square were recorded by species and percent cover.

除记录每个样地内草本植物物种的存在与否外，本数据集自2012年起新增了多度指标（盖度百分比）的测定工作。具体操作如下：将面积为5平方米的PVC样方放置于每个样地的边缘区域，随后对所有茎秆生长于该样方范围内的植物，按物种及其盖度百分比进行登记记录。