GSTDTAP  > 气候变化
DOI10.1029/2018GL077736
Low Phosphorus Availability Decreases Susceptibility of Tropical Primary Productivity to Droughts
Goll, D. S.1; Joetzjer, E.1,2; Huang, M.3; Ciais, P.1
2018-08-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2018
卷号45期号:16页码:8231-8240
文章类型Article
语种英语
国家France; Peoples R China
英文摘要

Large uncertainties in the susceptibility of tropical forest productivity to precipitation changes hamper climate change projection. Interactions between the availabilities of water and phosphorus could theoretically either increase or decrease the susceptibility of tropical gas exchange to variation of precipitation. The inclusion of phosphorus-water interactions in a land surface model reduces the coefficient of variance, a measure of variability, of biweekly gross primary productivity by a factor of 1.5-2.3 at three tropical forest sites in Brazil, bringing it closer to estimates from eddy covariance measurements and remote sensing. Soil drought conditions are attenuated due to 8-30% lower water consumption during wet periods in presence of phosphorus limitation. When soils are dry, plant phosphorus acquisition is impaired by reduced ion mobility, despite an increase in net phosphorus mineralization. We conclude that water-phosphorus interactions cannot be omitted in analysis of the resilience of tropical ecosystems to precipitation changes.


Plain Language Summary Phosphorus is an essential plant nutrient and limited availability of phosphorus in soils can negatively affect plant growth and photosynthesis. Therefore, a low soil supply of phosphorus can limit the capacity of ecosystems to draw down carbon dioxide emitted by human activities. Using model simulations for three tropical sites, we show that besides the negative effect on plant growth, low phosphorus availability can have a positive effect on photosynthesis during the dry season. The positive effect is caused by lower water consumption of plants during the preceding wet season due to an overall reduced plant growth. As the interactions between water and phosphorus availability are commonly overlooked in climate change assessment, we conclude that the susceptibility of tropical ecosystem to future changes in precipitation, and thereby the risk of a catastrophic die back of tropical vegetation, could be lower than previously estimated.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000445612500041
WOS关键词INDUCED TREE MORTALITY ; FOREST STRUCTURE ; AMAZON FORESTS ; CLIMATE-CHANGE ; CARBON FLUXES ; SOIL ; NITROGEN ; NUTRIENT ; WATER ; MODEL
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/27733
专题气候变化
作者单位1.IPSL LSCE CEA CNRS UVSQ Saclay, Lab Sci Climat & Environm, Gif Sur Yvette, France;
2.Univ Paul Sabatier, Lab Evolut & Diversite Biol, UMR 5174, CNRS, Toulouse, France;
3.Peking Univ, Sinofrench Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714
Goll, D. S.,Joetzjer, E.,Huang, M.,et al. Low Phosphorus Availability Decreases Susceptibility of Tropical Primary Productivity to Droughts[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(16):8231-8240.
APA Goll, D. S.,Joetzjer, E.,Huang, M.,&Ciais, P..(2018).Low Phosphorus Availability Decreases Susceptibility of Tropical Primary Productivity to Droughts.GEOPHYSICAL RESEARCH LETTERS,45(16),8231-8240.
MLA Goll, D. S.,et al."Low Phosphorus Availability Decreases Susceptibility of Tropical Primary Productivity to Droughts".GEOPHYSICAL RESEARCH LETTERS 45.16(2018):8231-8240.
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