Evidence map›Paper›PMID 27296134›Full record

SynthesisAnnals of botany2016

A meta-analysis of leaf nitrogen distribution within plant canopies.

Kouki Hikosaka, Niels P R Anten, Almaz Borjigidai, Chiho Kamiyama, Hidemitsu Sakai, Toshihiro Hasegawa, Shimpei Oikawa, Atsuhiro Iio, Makoto Watanabe, Takayoshi Koike and 2 more

Abstract readMeta-Analysis
In one paragraph

Synthesis in Annals of botany, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

29 citing papers in PubMed.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

12 authors.

Kouki HikosakaGraduate School of Life Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan, CREST, JST, Tokyo, Japan, hikosaka@m.tohoku.ac.jp.
Niels P R AntenCenter for Crop System Analysis, Wageningen University, PO Box 430, 6700 AK Wageningen, the Netherlands.
Almaz BorjigidaiInstitute of Chinese Minority Traditional Medicine, Minzu University of China, Beijing, 100081, China.
Chiho KamiyamaInstitute for the Advanced Study of Sustainability, United Nations University, Jingumae 5-53-70, Shibuya, Tokyo 150-8925, Japan.
Hidemitsu SakaiAgro-Meteorology Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan.
Toshihiro HasegawaAgro-Meteorology Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan.
Shimpei OikawaDepartment of Biology, Ibaraki University, Mito 310-8512, Japan.
Atsuhiro IioCenter for Education and Research in Field Science, Agricultural Faculty, Shizuoka University, Ohya, Shizuoka 422-8529, Japan.
Makoto WatanabeInstitute of Agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan.
Takayoshi KoikeSilviculture and Forest Ecological Studies, Hokkaido University, Sapporo 060-8589, Japan.
Kazuya NishinaNational Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan.
Akihiko ItoNational Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan Japan Agency for Marine-Earth Science and Technology, Yokohama 236-0001, Japan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

BACKGROUND AND

aimsLeaf nitrogen distribution in the plant canopy is an important determinant for canopy photosynthesis. Although the gradient of leaf nitrogen is formed along light gradients in the canopy, its quantitative variations among species and environmental responses remain unknown. Here, we conducted a global meta-analysis of leaf nitrogen distribution in plant canopies.

methodsWe collected data on the nitrogen distribution and environmental variables from 393 plant canopies (100, 241 and 52 canopies for wheat, other herbaceous and woody species, respectively). KEY

resultsThe trends were clearly different between wheat and other species; the photosynthetic nitrogen distribution coefficient (Kb) was mainly determined by leaf area index (LAI) in wheat, whereas it was correlated with the light extinction coefficient (KL) and LAI in other species. Some other variables were also found to influence Kb We present the best equations for Kb as a function of environmental variables and canopy characteristics. As a more simple function, Kb = 0·5KL can be used for canopies of species other than wheat. Sensitivity analyses using a terrestrial carbon flux model showed that gross primary production tended to be more sensitive to the Kb value especially when nitrogen content of the uppermost leaf was fixed.

conclusionOur results reveal that nitrogen distribution is mainly driven by the vertical light gradient but other factors such as LAI also have significant effects. Our equations contribute to an improvement in the projection of plant productivity and cycling of carbon and nitrogen in terrestrial ecosystems.

Indexed as

Models, BiologicalCarbonLightNitrogenPhotosynthesisPlant LeavesTriticumCarbonNitrogenCanopy photosynthesisfunctional groupleaf area indexlight distributionlight extinction coefficientmodelnitrogen allocationnitrogen useoptimization

Identifiers

PMID27296134
PMCPMC4970363

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.