Microclimate and seed bank under Pithecellobium keyense (Fabaceae) in a coastal scrubland

This study was conducted on a sandy beach of Yucatán, Mexico. We collected soil samples and measured microclimatic variables under 30 adult individuals of the shrub Pithecellobium keyense at three different positions under the canopy of every studied individual: “Open” or completely sunny, “Half shaded”, placed at the border of the canopy and “Fully shaded” placed under the canopy, next to the stem of the shrub. Seeds in the soil samples were collected, counted and tested for viablity. The shade of Pithecellobium keyense buffers for extreme values of environmental variables such as noon temperature, PPFD (Photosynthetic Photon Flux Density) and air relative humidity, this effect is stronger in the dry season. During the dry season, the probability of seed viability decreased with increasing PPFD. During the rainy season, the probability of seed viability was larger in the Half shade position and lower in Full shade and in the Open (high light) positions. The seed bank was larger during ..., To characterize the microclimate associated with the shade under P. keyense, 20 out of the 30 original P. keyense shrubs were randomly chosen. For each of these shrubs, ambient light (Photosynthetic Photon Flux Density or PPFD), air temperature (noon and midnight), soil water potential (predawn and noon) and air relative humidity (noon and midnight), were measured in three different positions beneath the canopy of each one of the shrubs: (1) Open: an area with no shrub cover, less than 1 m of distance of the corresponding shrub; (2) Half shaded: placed at the outer boundary of the shrub canopy; and (3) Full shaded, placed next to the plant stems. the total ambient light was measured with a quantum sensor (LI-190S, LI-COR, Lincoln, Nebraska, USA) placed 10 cm above the ground; air temperature and air relative humidity were measured with data recorders (Extech, SD800). Those data were recorded every 2 s and data was stored as a 10-minute average on a memory card (SM192, Campbell Scientifi..., , # Data from: Microclimate and seed bank under Pithecellobium keyense (Fabaceae) in a coastal scrubland

## Summary of dataset contents, contextualized in experimental procedures and results.

We collected soil samples and measured microenvironmental variables under adult *P. keyense* at three different positions under the canopy of every studied individual: Open or completely sunny, Half shaded, placed at the border of the canopy and Fully shaded placed under the canopy, next to the stem of the shrub. Position under the canopy was important in explaining differences in sampled points. Photosynthetic photon flux density (PPFD), minimum night-time temperature and maximum daytime temperature behaved differently among positions under the canopy both in rainy and dry seasons. During the rainy season, seed viability was no different among microenvironments, while during the dry season, it was higher in the Fully shaded microenvironments and lowest in the Open. Microclimatic variables under th...

本研究于墨西哥尤卡坦半岛的一处沙滩开展。我们在30株成年亮叶猴耳环（Pithecellobium keyense）的冠层下三个不同位置采集土壤样本并测定微气候变量："开阔区"（完全光照）、"半遮阴区"（位于冠层边缘）以及"全遮阴区"（冠层下靠近灌木茎干处）。对土壤样本中的种子进行收集、计数与活力检测。亮叶猴耳环的冠层遮阴可缓冲正午气温、光合光子通量密度（Photosynthetic Photon Flux Density, PPFD）以及空气相对湿度等环境变量的极端值，该缓冲效应在旱季更为显著。旱季时，种子活力随PPFD升高而降低；雨季时，半遮阴区的种子活力更高，而全遮阴区与开阔区（高光环境）的种子活力更低。土壤种子库规模在……为表征亮叶猴耳环冠层下遮阴微气候特征，我们从原30株灌木中随机选取20株，在每株冠层下的三个位置分别测定环境光（光合光子通量密度，即PPFD）、气温（正午与午夜）、土壤水势（黎明前与正午）以及空气相对湿度（正午与午夜）：(1) 开阔区：无灌木覆盖、距对应灌木小于1米的区域；(2) 半遮阴区：位于灌木冠层外边界处；(3) 全遮阴区：紧邻植物茎干处。总环境光使用量子传感器（LI-190S，LI-COR，美国内布拉斯加州林肯市）在距地面10 cm处测定；气温与空气相对湿度使用数据记录仪（Extech, SD800）测定，数据每2秒记录一次，并以10分钟平均值的形式存储于存储卡（SM192，Campbell Scientific……）中。# 数据来源：滨海灌丛中亮叶猴耳环（Pithecellobium keyense，豆科）冠层下的微气候与土壤种子库

数据集内容总结（结合实验流程与研究结果）：
我们在每株研究的成年亮叶猴耳环冠层下的三个不同位置采集土壤样本并测定微环境变量：开阔区（完全光照）、冠层边缘的半遮阴区，以及冠层下靠近灌木茎干的全遮阴区。冠层下的采样位置是解释采样点差异的关键因素。光合光子通量密度（PPFD）、夜间最低气温与日间最高气温在雨季与旱季的冠层下不同位置均表现出显著差异。雨季时，不同微环境下的种子活力无显著差异；而旱季时，全遮阴微环境的种子活力最高，开阔区的种子活力最低。冠层下的微气候变量……