Tree diversity reduces variability in sapling survival under drought-猫眼课题宝

DOI：

10.1111/1365-2745.14294

发表时间：

2024-04

期刊：

Journal of Ecology

影响因子：

5.5

通讯作者：

中科院分区：

环境科学与生态学1区

文献类型：

作者：

H. Blondeel;J. Guillemot;N. Martin-StPaul;Arsène Druel;Simon Bilodeau-Gauthier;J. Bauhus;C. Grossiord;A. Hector;Hervé Jactel;Joel Jensen;Christian Messier;Bart Muys;Hernán Serrano-León;H. Auge;Nadia Barsoum;Emiru Birhane;H. Bruelheide;Jeannine Cavender‐Bares;Chengjin Chu;Jonathan R. Cumming;Abebe Damtew;Nico Eisenhauer;Olga Ferlian;Sebastian Fiedler;G. Ganade;Douglas Godbold;Dominique Gravel;Jefferson S. Hall;Dirk Hölscher;K. Hulvey;J. Koricheva;H. Kreft;Cathleen Lapadat;Jingjing Liang;Xiaojuan Liu;Céline Meredieu;Simone Mereu;Rebecca A Montgomery;L. Morillas;C. Nock;A. Paquette;John D. Parker;William C. Parker;G. Paterno;M. Perring;Q. Ponette;Catherine Potvin;P. Reich;J. Rentch;B. Rewald;H. Sandén;Katherine Sinacore;Rachel J. Standish;Artur Stefanski;Patrick C. Tobin;Michiel van Breugel;M. Fagundes;M. Weih;L. Williams;Mo Zhou;M. Scherer‐Lorenzen;K. Verheyen;L. Baeten

增强树木多样性对于培养对干旱相关极端气候的适应能力可能很重要。到目前为止，树木多样性是否能够增加树木的存活率并降低其在幼龄人工林中的变异性，几乎没有引起人们的注意。我们对34个全球分布的树木多样性实验(363,167株，168种，3744块样地，7个生物群落)的苗木和幼树存活率进行了分析，以回答两个问题：(1)干旱和树木多样性是否改变了样地水平树木存活率的平均值和变异性，随着多样性的增加，存活率的变化越大，变化越小？以及(2)在单一培养中存活较差的物种是否在混合培养中存活得更好，以及特定的功能特征是否可以解释单一培养的存活？树种丰富度降低了样地水平存活率的变异性，而功能多样性(Rao‘s Q熵)提高了存活率，也降低了存活率的变异性。重要的是，随着干旱严重程度的增加，生存变异性的减少变得更加明显。我们发现，在单一栽培中存活率低的物种在干旱条件下在混合栽培中存活得相对较好。单一栽培的物种存活率与抗旱性(由膨压损失点等水力性状表示)、株高和保守的资源获取性状(如低叶片氮浓度和小叶片大小)呈正相关。综合。研究结果强调：(1)树木多样性对于减少干旱下幼苗和幼树存活率的变异性的有效性；(2)抗旱性和相关性状对于解释树木多样性和干旱对改变树木物种存活率的重要性。从生态学的角度来看，我们建议考虑混交以稳定树木的生存，特别是当具有抗旱物种的功能多样化的森林也促进了干旱敏感物种的高存活率时。

Enhancing tree diversity may be important to fostering resilience to drought‐related climate extremes. So far, little attention has been given to whether tree diversity can increase the survival of trees and reduce its variability in young forest plantations. We conducted an analysis of seedling and sapling survival from 34 globally distributed tree diversity experiments (363,167 trees, 168 species, 3744 plots, 7 biomes) to answer two questions: (1) Do drought and tree diversity alter the mean and variability in plot‐level tree survival, with higher and less variable survival as diversity increases? and (2) Do species that survive poorly in monocultures survive better in mixtures and do specific functional traits explain monoculture survival? Tree species richness reduced variability in plot‐level survival, while functional diversity (Rao's Q entropy) increased survival and also reduced its variability. Importantly, the reduction in survival variability became stronger as drought severity increased. We found that species with low survival in monocultures survived comparatively better in mixtures when under drought. Species survival in monoculture was positively associated with drought resistance (indicated by hydraulic traits such as turgor loss point), plant height and conservative resource‐acquisition traits (e.g. low leaf nitrogen concentration and small leaf size). Synthesis. The findings highlight: (1) The effectiveness of tree diversity for decreasing the variability in seedling and sapling survival under drought; and (2) the importance of drought resistance and associated traits to explain altered tree species survival in response to tree diversity and drought. From an ecological perspective, we recommend mixing be considered to stabilize tree survival, particularly when functionally diverse forests with drought‐resistant species also promote high survival of drought‐sensitive species.

Tree diversity reduces variability in sapling survival under drought

文献摘要

相似文献