Slope position affects growth and allometry of the endangered conifer Calocedrus macrolepis by mediating soil properties and microbial communities

Premise: The allometric relationships among growth traits are highly relevant for a tree’s fitness, however, the mechanism of how the slope position affects the plant growth and allometry remains poorly understood, hindering our understanding of the variation in allometry of trees along slope position in mountainous areas.
Methods: A typical slope of Calocedrus macrolepis plantation in southwest China was chosen to measure growth traits and their allometric relationships. In addition, spatial variations in soil properties and microbial communities were also investigated.
Results: Slope position altered the allometric growth pattern with the larger allometric exponents of the tree height, diameter and wood volume relative to the crown size and height under the branch for the downslope. Additionally, most of soil nutrients, microbial diversity and abundances were greater at mesoslope and downslope, especially at the surface soil layer. The relative abundance both in Chloroflexi and Actino..., We measured growth traits of C. macrolepis and their allometric relationships along the slope position. In addition, spatial variations in soil properties and microbial communities in soil depths of 0-20 cm, 20-40 cm and 40- 60 cm at upper, middle and down slope positions were investigated. We focused on the variations in growth and allometry along the slope position, and the effects of soil properties and microbial communities mediated by slope position on growth and allometry., , # Slope position affects growth and allometry of the endangered conifer Calocedrus macrolepis by mediating soil properties and microbial communities

[https://doi.org/10.5061/dryad.80gb5mkzk](https://doi.org/10.5061/dryad.80gb5mkzk)

Give a brief summary of dataset contents, contextualized in experimental procedures and results.

## Description of the data and file structure

We present the data of the study by Gao et al. (2024): Slope position affects growth and allometry of the endangered conifer *Calocedrus macrolepis* by mediating soil properties and microbial communities. The excel file (Raw Data) includes the following sheets:

1- Variables: Details on all the variables.

2- Tree growth data.

3- Allomitric growth exponents.

4- Soil properties data.

5- The relative abundances of major taxonomic groups at the phylum level for bacteria and fungi.

# 坡位通过调控土壤性质与微生物群落影响濒危针叶树种长柄翠柏（Calocedrus macrolepis）的生长与异速生长

## 研究背景
林木生长性状间的异速生长关系与树木适合度密切相关，但坡位如何调控植物生长及异速生长的机制仍尚不明确，这限制了我们对山地林木异速生长随坡位变化规律的认知。

## 研究方法
本研究选取中国西南地区的长柄翠柏（Calocedrus macrolepis）人工林典型坡地，测定其生长性状及异速生长关系；同时调查了上、中、下坡位下0-20 cm、20-40 cm及40-60 cm土层的土壤性质与微生物群落的空间变异。本研究聚焦于林木生长与异速生长随坡位的变化规律，以及坡位介导的土壤性质与微生物群落对林木生长及异速生长的调控效应。

## 研究结果
坡位改变了林木的异速生长模式：下坡位的树高、胸径与材积相对于冠幅、枝下高的异速生长指数更高。此外，多数土壤养分、微生物多样性及群落相对丰度在中坡与下坡位更高，尤其在表层土壤中。绿弯菌门（Chloroflexi）与放线菌门（Actinobacteria）的相对丰度...。本研究测定了长柄翠柏的生长性状及其沿坡位梯度的异速生长关系，并调查了不同坡位、不同土层深度下土壤性质与微生物群落的空间变异，旨在阐明坡位对林木生长及异速生长的调控机制，以及土壤性质与微生物群落的介导作用。

## 数据集内容概述
请结合实验流程与研究结果，对本数据集的内容进行简要说明。

## 数据集内容与文件结构
本数据集收录了Gao等人（2024）的研究数据，该研究主题为“坡位通过调控土壤性质与微生物群落影响濒危针叶树种长柄翠柏的生长与异速生长”。原始数据为Excel格式文件（命名为Raw Data），包含以下工作表：
1. 变量表：所有研究变量的详细说明
2. 林木生长数据集
3. 异速生长指数表
4. 土壤性质数据集
5. 细菌与真菌门水平主要分类类群的相对丰度数据集

数据集链接：[https://doi.org/10.5061/dryad.80gb5mkzk](https://doi.org/10.5061/dryad.80gb5mkzk)