Combined heat and drought events reduce first-year survival of tree seedlings, especially at southern range margins

These are the data associated with a project testing how experimental drought and heat treatments impact survival and growth of first-year tree seedlings common to the northeastern United States. The datasets include seedling-level metrics of survival and growth (height and total biomass), approximate substrate moisture throughout the experimental period, and data on traits including leaf mass per area, minimum epidermal conductance, turgor loss point, and root-to-shoot biomass ratio.
, , # Data from: Combined heat and drought events reduce first-year survival of tree seedlings, especially at southern range margins

Dataset DOI: [10.5061/dryad.k3j9kd5ph](https://doi.org/10.5061/dryad.k3j9kd5ph)

## Description of the data and file structure

Project: Combined heat and drought events reduce first-year survival of tree seedlings, especially at southern range margins

Authors: Emily G. MacDonald, Melissa D. Cullina, Bryan J. Peterson, Jay W. Wason

Date compiled: December 2025

Data compiled by Emily MacDonald

### Files and variables

Note: NA= Not applicable, or absent information

#### File: final_biomass_RS.csv

**Description:** These data contain the total biomass and root-to-shoot biomass ratio of a subset of seedlings from this experiment, sampled at the end of the growing season.

##### Variables

* ID: unique seedling identifier
* chamber: treatment chamber (representing on experimental unit and a single application of a heat and drought treatment). There are 27 to...,