Plant functional traits affect biomass responses to global change: a meta-analysis

Whether and how the responses of above- (AGB) and belowground biomass (BGB) and aboveground net primary production (ANPP) to global changes are linked to plant functional traits is unclear. We conducted a global meta-analysis based on 2561 observations from 318 manipulative studies (primarily forest, grassland and cropland monocultures) to examine the effect of plant functional traits of dominant species (i.e., morphological and chemical traits, mycorrhizal association type and symbiotic nitrogen (N) fixation) on the responses of plant biomass production to global change drivers, i.e., elevated CO₂ (eCO₂), elevated nutrient (eNutrient), elevated water (eWater), warming, and drought.We test following hypotheses (1) the responses of biomass production to GCDs will be stronger in plant communities dominated by fast-growing species than in those dominated by slow-growing species; (2) the responses of plant biomass production in EcM species-dominated communities to eCO₂, eWater, warming and drought will be stronger than those in AM species-dominated communities, but the response of plant biomass production to eNutrient will be stronger in communities dominated by AM species than those dominated by EcM species; (3) the response of plant biomass production to eCO₂, eWater, warming and drought will be more pronounced in communities dominated by N-fixing species than that dominated by non-N-fixing plants, while the reverse response will be found to eNutrient.

目前尚不清楚地上生物量（aboveground biomass, AGB）与地下生物量（belowground biomass, BGB）以及地上净初级生产力（aboveground net primary production, ANPP）对全球变化的响应是否与植物功能性状存在关联，且其具体关联机制尚未明确。本研究基于318项控制实验研究（研究对象主要涵盖森林、草原与农田单作生态系统）中的2561组观测数据开展全球尺度元分析，旨在探究优势种的植物功能性状——涵盖形态与化学性状、菌根共生类型以及共生固氮（nitrogen, N）能力——对植物生物量生产响应全球变化驱动因子（即CO₂浓度升高（eCO₂）、养分添加（eNutrient）、水分添加（eWater）、气候变暖和干旱）的调控效应。本研究验证如下三项假说：（1）速生物种占优的植物群落，其生物量生产对全球变化驱动因子的响应强度显著高于慢生物种占优的群落；（2）外生菌根（EcM）物种占优的群落，其生物量生产对eCO₂、eWater、气候变暖和干旱的响应强度高于丛枝菌根（AM）物种占优的群落；而养分添加驱动的生物量响应则在AM物种占优的群落中更为显著；（3）固氮物种占优的群落，其生物量生产对eCO₂、eWater、气候变暖和干旱的响应强度高于非固氮植物占优的群落，而该响应趋势在养分添加驱动的处理中恰好相反。

搜集汇总

背景与挑战

背景概述

该数据集通过元分析研究了植物功能性状（如形态和化学性状、菌根关联类型和固氮能力）如何影响植物生物量对全球变化驱动因素（如CO2升高、营养增加、水分增加、变暖和干旱）的响应。研究基于318项操纵性研究的2561个观察结果，主要针对森林、草地和农田单作系统。