Parramore Island of the Virginia Coast Reserve Permanent Plot Resurvey: Clip plot data 1996

First 3-5 year resurvey of permanent monitoring plots using essentially the same protocol as the intial survey of 1992-1993 except that: 1.) standing biomass of the herbaceous groundcover was added (including for new lower salt marsh plots) using clip plots at the subplot locations; and 2.) an estimate of landcover/habitat class aggregation was conducted surrounding each plot center out to 60m in the four cardinal directions. Extends baseline data useful for estimating landscape-scale vegetative productivity, mortality, and turnover; for establishing pre-disturbance conditions in the case of later stand- or island-wide disturbance; and for assisting in the ground-truthing of landcover and habitat classification using aerial or satellite remote-sensing imagry.

本数据集为针对永久监测样地（permanent monitoring plots）开展的首次3-5年期复测，所采用的调查规程（protocol）与1992-1993年的初始调查基本一致，仅存在两处调整：1. 新增草本地表植被（herbaceous groundcover）现存量（standing biomass）测定环节，覆盖新增的低盐沼样地，测定工作在副样地（subplot）位置采用收割样方法（clip plots）完成；2. 以每个样地中心为原点，向四个主方位（cardinal directions）各延伸60米的范围内，开展土地覆盖/生境类群（landcover/habitat class）聚合度评估。本数据集拓展的基线数据可应用于多类科研场景：一是估算景观尺度（landscape-scale）下的植被生产力（vegetative productivity）、死亡率（mortality）与周转速率（turnover）；二是在后续发生林分或全岛尺度的干扰事件时，确定干扰前基准状态（pre-disturbance conditions）；三是辅助利用航空或卫星遥感影像（remote-sensing imagery）开展土地覆盖与生境分类的地面验证（ground-truthing）工作。