A comparison of water use strategies between pure and mixed forests on the Chinese Loess Plateau

To elucidate how pure and mixed forests adjust their water use strategies under interannual precipitation variability, we conducted a systematic investigation of root architecture, water dynamics, and physiological regulation in pure Pinus tabuliformis, pure Robinia pseudoacacia, and their mixed forests on the Chinese Loess Plateau during a wet year (2022) and a normal year (2023). By analyzing fine root vertical distribution, root length density, soil moisture, stand transpiration, stable isotope-based water sources, and stomatal behavior, we found that mixed forests accumulated higher fine root biomass than either pure forest type, while exhibiting intermediate root length density. Seasonal fluctuations in soil water content and stand transpiration were more pronounced in mixed forests than in pure P. tabuliformis stands, though less variable than in pure R. pseudoacacia stands. Transpiration dynamics closely tracked root length density patterns and responded strongly to environmental..., , # A comparison of water use strategies between pure and mixed forests on the Chinese Loess Plateau

Dataset DOI: 10.5061/dryad.pvmcvdp00

## Description of the data and file structure

This dataset (doi-10.5061dryad.pvmcvdp00.zip)includes eight data sheets for statistical analyses.

Files and variables

### File: Dataset1-Environmentaldata.csv

Description: This data table contains the precipitation (P), vapor pressure deficit (VDP), air temperature (Ta), relative humidity in air (RH) during the tree growing seasons of 2022 and 2023, as well as the relative extractable water of pure *Pinus tabuliformis* forest (PT), pure *Robinia pseudoacacia* forest (RP), and *Pinus tabuliformis* * *Robinia pseudoacacia* forest (PT*RP).

Variables

* Variables-2022/2023: Variables in 2022 or in 2023
* DOY: Day of year
* P: Precipitation (mm)
* Ta: Air temperature (°C）
* VPD: Vapor pressure deficit (kPa)
* RH: Relative humidity (%)
* REW: Relative extractable soil water
* PT: *Pinus tabuliformis* fores...,

为阐明纯林与混交林在年际降水波动下如何调控其水分利用策略，本研究于2022年（湿润年）和2023年（正常年），在中国黄土高原开展了油松（Pinus tabuliformis）纯林、刺槐（Robinia pseudoacacia）纯林及其混交林的根系构型、水分动态与生理调控机制系统调查。通过分析细根垂直分布、根长密度、土壤含水量、林分蒸腾、基于稳定同位素的水分来源以及气孔行为，本研究发现：混交林的细根生物量高于两种纯林，而根长密度处于两者之间。混交林的土壤含水量与林分蒸腾的季节波动幅度大于油松纯林，但小于刺槐纯林。蒸腾动态与根长密度分布高度吻合，且对环境因子响应显著……
# 中国黄土高原纯林与混交林水分利用策略对比

数据集DOI：10.5061/dryad.pvmcvdp00

## 数据与文件结构说明
本数据集（doi-10.5061dryad.pvmcvdp00.zip）包含8张用于统计分析的数据表。

### 文件与变量说明
#### 文件：Dataset1-Environmentaldata.csv
文件说明：该数据表包含2022年与2023年树木生长季的降水量（P）、水汽压亏缺（Vapor Pressure Deficit, VPD）、气温（Ta）、空气相对湿度（RH），以及油松纯林（PT）、刺槐纯林（RP）和油松-刺槐混交林（PT*RP）的相对可提取土壤含水量。

#### 变量说明
* Variables-2022/2023：2022年或2023年的变量
* DOY：日序（一年中的第几日）
* P：降水量（mm）
* Ta：气温（°C）
* VPD：水汽压亏缺（kPa）
* RH：空气相对湿度（%）
* REW：相对可提取土壤含水量
* PT：油松（Pinus tabuliformis）林……