Long-term monitoring of woody plants of Do?ana shrublands 2008-2023

The long-term monitoring on plant cover of Do?ana shrublands is part of a harmonised protocol for the Long-term Ecological Monitoring Program of Natural Resources and Processes targeting Terrestrial Vegetation. The general aim of this protocol is to monitor and assess the dynamics of the main dominant terrestrial and aquatic vegetation types of Do?ana. For shrublands, percent cover is recorded annually starting from 2008 to the present (2023) by staff of the Monitoring Team by one sampling campaign per year during the flowering season (between March and May) in 21 permanent square plots (15x15m). Cover is measured using the line intercept method in 3 transects of 15 m length oriented from East to West and located at fixed points of 2.5, 7.5 and 12.5 metres at both sides of the plot. Using the line-intercept method, the coverage of each species is measured with a measuring tape, including the class age (adult or seedling) and the canopy status (green or dead). This method enables to calculate the percent cover for each species across the transect and for the whole plot, including data on class age and percent of dry and green canopy, additionally to the percent of bare soil, plant density, species richness and vascular plant diversity for every plot.

多尼亚纳（Doñana）灌丛植被长期监测，是针对陆地植被的自然资源与过程长期生态监测计划（Long-term Ecological Monitoring Program of Natural Resources and Processes）统一规程的组成部分。该规程的总体目标为监测并评估多尼亚纳地区主要优势陆地与水生植被类型的动态变化。针对灌丛群落，由监测团队成员自2008年至今（2023年）每年开展1次采样调查，在21个规格为15m×15m的永久方形样地中，于植物花期（3月至5月期间）记录植被盖度。具体测量流程为：在每个样地两侧的2.5米、7.5米及12.5米固定点位，设置3条东西走向、长度15米的样线，采用线截距法（line intercept method）开展盖度测量。使用卷尺测定各物种的盖度，同时记录其年龄类群（成株或幼苗）与冠层状态（绿色或枯亡）。通过该方法，可计算单条样线及整个样地内各物种的盖度百分比，此外还可获取各样地的各龄类群数据、枯绿冠层占比，以及裸土占比、植物密度、物种丰富度与维管植物多样性等相关数据。