World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
39
Citations
7306
World Ranking
8287
National Ranking
2959

Brent R. Helliker publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Brent R. Helliker sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41 publications 690+

This scientist: 95 publications — 11th percentile

11% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

Brent R. Helliker D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Brent R. Helliker sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 39 D-Index — 15th percentile

15% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

Overview

Brent R. Helliker is affiliated with the University of Pennsylvania in the United States and conducts research primarily in the fields of Environmental Science and Agricultural and Biological Sciences. Their work spans several subfields, including Global and Planetary Change, Plant Science, Nature and Landscape Conservation, Ecology, and Atmospheric Science.

The main topics explored in Helliker's research cover Plant Water Relations and Carbon Dynamics, Ecology and Vegetation Dynamics Studies, Remote Sensing in Agriculture, Species Distribution and Climate Change, Groundwater and Isotope Geochemistry, Plant responses to water stress, and Plant Taxonomy and Phylogenetics.

Helliker has contributed to multiple publications in notable venues, frequently publishing in New Phytologist and Proceedings of the National Academy of Sciences. Other publication venues include bioRxiv (Cold Spring Harbor Laboratory), Plant Cell & Environment, and Research Square.

  • New Phytologist
  • Proceedings of the National Academy of Sciences
  • bioRxiv (Cold Spring Harbor Laboratory)
  • Plant Cell & Environment
  • Research Square (Research Square)

Recent papers by Helliker include:

  • Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water, 2020, Proceedings of the National Academy of Sciences
  • No evidence of canopy-scale leaf thermoregulation to cool leaves below air temperature across a range of forest ecosystems, 2022, Proceedings of the National Academy of Sciences
  • Imaging canopy temperature: shedding (thermal) light on ecosystem processes, 2021, New Phytologist
  • MicroRNA156-mediated changes in leaf composition lead to altered photosynthetic traits during vegetative phase change, 2020, New Phytologist
  • Lineage-based functional types: characterising functional diversity to enhance the representation of ecological behaviour in Land Surface Models, 2020, New Phytologist

Frequent collaborators in Helliker's research include Christopher J. Still, Daniel M. Griffith, Stephanie Pau, Jesse B. Nippert, and Che-Ling Ho.

Best Publications

  • C 4 photosynthesis, atmospheric CO 2 , and climate

    James R. Ehleringer;Thure E. Cerling;Brent R. Helliker

  • A re-evaluation of carbon storage in trees lends greater support for carbon limitation to growth

    Erin Wiley;Brent Helliker

  • Stable isotopes in leaf water of terrestrial plants.

    Lucas A. Cernusak;Margaret M. Barbour;Stefan K. Arndt;Alexander W. Cheesman

  • Methane flux in non-wetland soils in response to nitrogen addition: a meta-analysis.

    E. L. Aronson;B. R. Helliker

  • Subtropical to boreal convergence of tree-leaf temperatures

    Brent R. Helliker;Suzanna L. Richter

  • Stem water cryogenic extraction biases estimation in deuterium isotope composition of plant source water

    Yongle Chen;Brent R. Helliker;Xianhui Tang;Fang Li

  • Establishing a grassland signature in veins: 18O in the leaf water of C3 and C4 grasses.

    Brent R. Helliker;James R. Ehleringer

  • The energetic and carbon economic origins of leaf thermoregulation

    Sean T. Michaletz;Sean T. Michaletz;Michael D. Weiser;Nate G. McDowell;Jizhong Zhou;Jizhong Zhou;Jizhong Zhou

  • Plant Thermoregulation: Energetics, Trait-Environment Interactions, and Carbon Economics.

    Sean T. Michaletz;Sean T. Michaletz;Michael D. Weiser;Jizhong Zhou;Jizhong Zhou;Jizhong Zhou;Michael Kaspari;Michael Kaspari

  • The effects of defoliation on carbon allocation: can carbon limitation reduce growth in favour of storage?

    Erin Wiley;Sarah Huepenbecker;Brenda B Casper;Brent R Helliker

  • Hydrogen isotope ratios of leaf wax n-alkanes in grasses are insensitive to transpiration

    Francesca A. McInerney;Brent R. Helliker;Katherine H. Freeman

  • Plant response to climate change varies with topography, interactions with neighbors, and ecotype.

    Pierre Liancourt;Laura A. Spence;Daniel S. Song;Ariuntsetseg Lkhagva

  • Differential 18O enrichment of leaf cellulose in C3 versus C4 grasses

    Brent R. Helliker;James R. Ehleringer

  • Thermal Imaging in Plant and Ecosystem Ecology: Applications and Challenges

    Christopher Still;Rebecca L. Powell;Donald Aubrecht;Youngil Kim

  • Environmental impacts on the diversity of methane-cycling microbes and their resultant function

    Emma L. Aronson;Emma L. Aronson;Steven D. Allison;Brent R. Helliker

  • Continuous, long-term, high-frequency thermal imaging of vegetation: Uncertainties and recommended best practices

    Donald M. Aubrecht;Brent R. Helliker;Michael L. Goulden;Dar A. Roberts

  • No evidence of canopy-scale leaf thermoregulation to cool leaves below air temperature across a range of forest ecosystems

    Unknown

  • A rapid and precise method for sampling and determining the oxygen isotope ratio of atmospheric water vapor

    Brent R. Helliker;John S. Roden;Craig Cook;James R. Ehleringer

  • Stable Isotopes and Carbon Cycle Processes in Forests and Grasslands

    J. R. Ehleringer;D. R. Bowling;L. B. Flanagan;J. Fessenden

  • Transpiration rate relates to within- and across-species variations in effective path length in a leaf water model of oxygen isotope enrichment

    Xin Song;Margaret M. Barbour;Margaret M. Barbour;Graham D. Farquhar;David R. Vann

  • The contribution of C3 and C4 plants to the carbon cycle of a tallgrass prairie: an isotopic approach

    Christopher J. Still;Christopher J. Still;Joseph A. Berry;Miquel Ribas-Carbo;Miquel Ribas-Carbo;Brent R. Helliker;Brent R. Helliker

Frequent Co-Authors

Joseph A. Berry
Joseph A. Berry Carnegie Institution for Science
Christopher J. Still
Christopher J. Still Oregon State University
James R. Ehleringer
James R. Ehleringer University of Utah
Brenda B. Casper
Brenda B. Casper University of Pennsylvania
Jizhong Zhou
Jizhong Zhou University of Oklahoma
Michael L. Goulden
Michael L. Goulden University of California, Irvine
Pierre Liancourt
Pierre Liancourt University of Tübingen
Peter S. Petraitis
Peter S. Petraitis University of Pennsylvania
William J. Riley
William J. Riley Lawrence Berkeley National Laboratory
Ankur R. Desai
Ankur R. Desai University of Wisconsin–Madison

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