World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
65
Citations
22324
World Ranking
2155
National Ranking
876

Timothy B. Parkin 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 Timothy B. Parkin 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: 283 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: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 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 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 134 publications — 32nd percentile

32% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

Timothy B. Parkin 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 Timothy B. Parkin 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: 199 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: 19 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: 99 scientists
30 D-Index 125+

This scientist: 65 D-Index — 78th percentile

78% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

Overview

Timothy B. Parkin is affiliated with the Agricultural Research Service in the United States. Their research spans multiple aspects of environmental science and agricultural and biological sciences, with a focus on soil processes and nutrient dynamics.

Their work addresses several interconnected topics, including:

  • Soil Carbon and Nitrogen Dynamics
  • Atmospheric and Environmental Gas Dynamics
  • Groundwater and Isotope Geochemistry
  • Groundwater Flow and Contamination Studies
  • Soil and Water Nutrient Dynamics
  • Hydrology and Watershed Management Studies
  • Lipid Metabolism and Biosynthesis

Their publication record includes contributions to the following journals:

  • Journal of Environmental Quality
  • Agriculture Ecosystems & Environment

Notable recent papers include:

  • "Global Research Alliance N2O chamber methodology guidelines: Flux calculations" (2020), published in Journal of Environmental Quality
  • "Nitrate losses and nitrous oxide emissions under contrasting tillage and cover crop management" (2022), published in Journal of Environmental Quality
  • "Nitrate losses in subsurface drainage and nitrous oxide emissions from a winter camelina relay cropping system reveal challenges to sustainable intensification" (2022), published in Agriculture Ecosystems & Environment

Frequent collaborators include:

  • Peter O'Brien
  • Bryan D. Emmett
  • Robert W. Malone
  • John L. Kovar
  • T. C. Kaspar

Their research integrates soil science with environmental chemistry and engineering, addressing challenges relevant to sustainable agriculture, nutrient management, and greenhouse gas emissions. Their focus on flux calculations and emissions relates directly to environmental monitoring and policy considerations in agricultural landscapes.

Best Publications

  • FIELD-SCALE VARIABILITY OF SOIL PROPERTIES IN CENTRAL IOWA SOILS

    C. A. Cambardella;T. B. Moorman;T. B. Parkin;D. L. Karlen

  • Defining and Assessing Soil Quality

    John W. Doran;Timothy B. Parkin

  • Soil microsites as a source of denitrification variability

    Timothy B. Parkin

  • Direct Measurement of Oxygen Profiles and Denitrification Rates in Soil Aggregates

    Alan J. Sexstone;Niels Peter Revsbech;Timothy B. Parkin;James M. Tiedje

  • Quantitative Indicators of Soil Quality: A Minimum Data Set

    John W. Doran;Timothy B. Parkin

  • NITROUS OXIDE EMISSIONS FROM CORN–SOYBEAN SYSTEMS IN THE MIDWEST

    Timothy B. Parkin;Thomas C. Kaspar

  • Spatial Variability of Microbial Processes in Soil—A Review

    T. B. Parkin

  • Temporal Response of Soil Denitrification Rates to Rainfall and Irrigation

    Alan J. Sexstone;Timothy B. Parkin;James M. Tiedje

  • Rye Cover Crop and Gamagrass Strip Effects on NO3 Concentration and Load in Tile Drainage

    T.C. Kaspar;D.B. Jaynes;T.B. Parkin;T.B. Moorman

  • Comparing carbon substrates for denitrification of subsurface drainage water.

    Colin M. Greenan;Thomas B. Moorman;Thomas C. Kaspar;Timothy B. Parkin

  • Impact of Biochar on Manure Carbon Stabilization and Greenhouse Gas Emissions

    Natalia Rogovska;David Laird;Richard Cruse;Pierce Fleming

  • Impact of Nitrogen Fertilization and Cropping System on Carbon Sequestration in Midwestern Mollisols

    Ann E. Russell;David Laird;Timothy B. Parkin;Antonio P. Mallarino

  • Water Quality in Walnut Creek Watershed: Nitrate-Nitrogen in Soils, Subsurface Drainage Water, and Shallow Groundwater

    C. A. Cambardella;T. B. Moorman;D. B. Jaynes;J. L. Hatfield

  • Calculating the detection limits of chamber-based soil greenhouse gas flux measurements.

    T. B. Parkin;R. T. Venterea;S. K. Hargreaves

  • Effectiveness of oat and rye cover crops in reducing nitrate losses in drainage water

    T.C. Kaspar;D.B. Jaynes;T.B. Parkin;T.B. Moorman

  • Effect of sampling frequency on estimates of cumulative nitrous oxide emissions.

    Timothy B. Parkin

  • Simulating long-term impacts of cover crops and climate change on crop production and environmental outcomes in the Midwestern United States

    Andrea D. Basche;Sotririos V. Archontoulis;Thomas C. Kaspar;Dan B. Jaynes

  • Denitrification activity, wood loss, and N2O emissions over 9 years from a wood chip bioreactor

    Thomas B. Moorman;Timothy B. Parkin;Thomas C. Kaspar;Dan B. Jaynes

  • Field and Laboratory Tests of Soil Respiration

    Timothy B. Parkin;John W. Doran;E. Franco-Vizcaíno

  • Adaptation of Denitrifying Populations to Low Soil pH

    Timothy B. Parkin;Alan J. Sexstone;James M. Tiedje

Frequent Co-Authors

Jerry L. Hatfield
Jerry L. Hatfield Iowa State University
Dan B. Jaynes
Dan B. Jaynes Agricultural Research Service
Thomas M. Isenhart
Thomas M. Isenhart Iowa State University
John H. Prueger
John H. Prueger Agricultural Research Service
Cynthia A. Cambardella
Cynthia A. Cambardella Agricultural Research Service
John W. Doran
John W. Doran University of Nebraska–Lincoln
Douglas L. Karlen
Douglas L. Karlen Iowa State University
Matthew J. Helmers
Matthew J. Helmers Iowa State University
Thomas B. Moorman
Thomas B. Moorman Agricultural Research Service
Brian J. Kerr
Brian J. Kerr Agricultural Research Service

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