当前位置： SCI文献检索 > GLOBAL CHANGE BIOLOGY期刊下所有文献 > Low phosphorus supply constrains plant responses to elevated CO2 : A meta-analysis.

Low phosphorus supply constrains plant responses to elevated CO2 : A meta-analysis.

Abstract：

:Phosphorus (P) is an essential macro-nutrient required for plant metabolism and growth. Low P availability could potentially limit plant responses to elevated carbon dioxide (eCO2 ), but consensus has yet to be reached on the extent of this limitation. Here, based on data from experiments that manipulated both CO2 and P for young individuals of woody and non-woody species, we present a meta-analysis of P limitation impacts on plant growth, physiological, and morphological response to eCO2 . We show that low P availability attenuated plant photosynthetic response to eCO2 by approximately one-quarter, leading to a reduced, but still positive photosynthetic response to eCO2 compared to those under high P availability. Furthermore, low P limited plant aboveground, belowground, and total biomass responses to eCO2 , by 14.7%, 14.3%, and 12.4%, respectively, equivalent to an approximate halving of the eCO2 responses observed under high P availability. In comparison, low P availability did not significantly alter the eCO2 -induced changes in plant tissue nutrient concentration, suggesting tissue nutrient flexibility is an important mechanism allowing biomass response to eCO2 under low P availability. Low P significantly reduced the eCO2 -induced increase in leaf area by 14.3%, mirroring the aboveground biomass response, but low P did not affect the eCO2 -induced increase in root length. Woody plants exhibited stronger attenuation effect of low P on aboveground biomass response to eCO2 than non-woody plants, while plants with different mycorrhizal associations showed similar responses to low P and eCO2 interaction. This meta-analysis highlights crucial data gaps in capturing plant responses to eCO2 and low P availability. Field-based experiments with longer-term exposure of both CO2 and P manipulations are critically needed to provide ecosystem-scale understanding. Taken together, our results provide a quantitative baseline to constrain model-based hypotheses of plant responses to eCO2 under P limitation, thereby improving projections of future global change impacts.

journal_name

Glob Chang Biol

journal_title

Global change biology

authors

Jiang M,Caldararu S,Zhang H,Fleischer K,Crous KY,Yang J,De Kauwe MG,Ellsworth DS,Reich PB,Tissue DT,Zaehle S,Medlyn BE

doi

10.1111/gcb.15277

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

5856-5873

issue

eissn

1354-1013

issn

1365-2486

journal_volume

pub_type

杂志文章,meta分析

在线工具

Low phosphorus supply constrains plant responses to elevated CO2 : A meta-analysis.