Li Guo, Ph.D.

  • Assistant Research Professor
Li Guo, Ph.D.
446 Agricultural Sciences & Industries Building
University Park, PA 16802

Areas of Expertise

  • Hydropedology, Near-surface Geophysics, Soil Physics
  • Remote Sensing of Environment, Climate Change
  • Critical Zone Science, Ecology and Evolution


  1. -Ph.D., Remote Sensing, Beijing Normal University, China, 2013
  2. -M.S., Ecology, Fudan University, China, 2010
  3. -B.S., Biology, Sichuan University, China, 2007

Professional Employments

  • 2016.11-Present: Assistant Research Professor, Pennsylvania State University
  • 2015.11-2016.10: Postdoc Scholar, Pennsylvania State University
  • 2013.07-2015.10: Assistant Professor, Beijing Normal University

Research Areas and Relevant Publications

Hydropedology and Critical Zone Science 

  • Guo L, Hallett P, Müller K (2020). Landmark Papers: No. 9 Jarvis, N.J. 2007. A review of non-equilibrium water flow and solute transport in soil macropores: principles, controlling factors and consequences for water quality. European Journal of Soil Science, 58, 523–546. Commentary on the impact of Jarvis (2007). European Journal of Soil Science, in press. doi: 10.1111/ejss.12931
  • Guo L, Mount G, Hudson S, Lin H, Levia D (2020). Pairing geophysical techniques improves understanding of the near-surface Critical Zone: visualization and confirmation of preferential routing of stemflow along coarse roots. Geoderma, 357: 1-12. doi: 10.1016/j.geoderma.2019.113953
  • Zong R, Wang Z, Wu Q, Guo L*, Lin H (2020). Characteristics of carbon emissions in cotton fields under mulched drip irrigation. Agricultural Water Management, 231: 1-11. doi: 10.1016/j.agwat.2019.105992 (*corresponding author) 
  • Tao W, Wang Q, Guo L, Lin H (2020). A new analytical model for predicting soil erosion and nutrient loss during crop growing on the Chinese Loess Plateau. Soil & Tillage Research, 199: 1-12. doi: 10.1016/j.still.2020.104585 
  • Tao W, Wang Q, Guo L, Lin H, Chen X, Sun Y, Ning S (2020). An enhanced rainfall-runoff model with canopy interception coupled. Hydrological Processes, 2020: 1-17. doi: 10.1002/hyp.13696
  • Feng L, Lin H, Zhang M, Guo L, Jin Z, Liu X (2020). Development and evolution of loess vertical joints on the Chinese Loess Plateau at different spatiotemporal scales. Engineering Geology, 265: 1-15. doi: 10.1016/j.enggeo.2019.105372
  • Guo L, Lin H, Fan B, Nyquist J, Toran L, Mount G (2019) . Preferential flow through shallow fractured bedrock and a 3D fill-and-spill model of hillslope subsurface hydrology. Journal of Hydrology, 576: 430-442. doi: 10.1016/j.jhydrol.2019.06.070 
  • Jin Z, Guo L*, Wang Y, Yu Y, Lin H, Chen Y, Chu G, Zhang J (2019). Effects of dams and reservoirs on soil salinization in the reshaped creek valley on the Chinese Loess Plateau. Geoderma, 339: 115-125. doi: 10.1016/j.geoderma.2018.12.048 (*corresponding author)
  • Jin Z, Guo L*, Fan B, Lin H, Yu Y, Zheng H, Chu G, Zhang J (2019). Effects of afforestation on land surface temperature in a pair of catchments on Chinese Loess Plateau. Catena, 175: 356-366. doi:10.1016/j.catena.2018.12.036 (*corresponding author)
  • Guo L, Fan B, Zhang J, Lin H (2018). Occurrence of subsurface lateral flow in the Shale Hills Catchment as indicated by a soil water mass balance method. European Journal of Soil Science, 67:771-786. doi: 10.1111/ejss.12701
  • Liu M, Guo L*, Yi J, Lin H, Lou S, Zhang H, Li T (2018). Dye tracer experiments to characterize preferential flow and its interaction with the soil matrix in the Three Gorges Reservoir Area of China. Soil Research, 56:588-600.  doi: 10.1071/SR17238 (*corresponding author)
  • Jin Z, Guo L*, Lin H, Wang Y, Yu Y, Chu G, Zhang J (2018). Soil moisture response to rainfall on the Chinese Loess Plateau after the long-term vegetation rehabilitation. Hydrological Processes, 32:1738-1754. doi: 10.1002/hyp.13143  (*corresponding author)
  • Guo L, Lin H (2018). Addressing Two Bottlenecks to Advance the Understanding of Preferential Flow in Soils. Advances in Agronomy, 147:61-117. doi: 10.1016/bs.agron.2017.10.002
  • Nyquist J, Toran L, Pitman L, Guo L, Lin H (2018). Testing the Fill-and-Spill Model of Subsurface Flow Using GPR and Dye Tracing. Vadose Zone Journal, 16:1-12. doi: 10.2136/vzj2017.07.0142
  • Li L, DiBiase R, Del Vecchio J. Marcon V, Hoagland B, Xiao D, Wayman C, Tang Q, He Y, Silverhar P, Forsythe B, Williams J, Shapich D, Mount G, Kaye J, Guo L, Lin H, Dere A, Brubaker K, Kaye M, Davis K, Brantely S. (2018). The Susquehanna Shale Hills Critical Zone Observatory (SSHCZO): Garner Run and Cole Farm. Vadose Zone Journal, 17: 1-15. doi: 10.2136/vzj2018.03.0063
  • Ma Y, Li X, Guo L, Lin H (2017). Hydropedology: Interactions between pedologic and hydrologic processes across spatiotemporal scales. Earth-Science Reviews, 171:181-195. doi: 10.1016/j.earscirev.2017.05.014
  • Guo L, Lin H (2016). Critical Zone Research and Observatories: Current Status and Future Perspectives. Vadose Zone Journal, 15:1-14. doi: 10.2136/vzj2016.06.0050
  • Wang M, Lu B, Wang J, Zhang H, Guo L, Lin H (2016). Using Dual Isotopes and a Bayesian Isotope Mixing Model to Evaluate Nitrate Sources of Surface Water in a Drinking Water Source Watershed, East China. Water, 8(355):1-16. doi: 10.3390/w8080355
  • Guo L, Chen J, Lin H (2014). Subsurface Lateral Flow Network on a Hillslope Revealed by Time-lapse Ground Penetrating Radar, Water Resource Research, 50: 1-21. doi: doi:10.1002/2013WR014603.


 Imaging and Quantification of Plant Roots by Ground-Penetrating Radar (GPR)

  • Cui X, Liu X, Cao X, Fan B, Zhang Z, Chen J, Chen X, Lin H, Guo L* (2019). Pairing dual frequency GPR in summer and winter enhances the detection and mapping of lateral coarse roots in the semi-arid shrubland in north China. European Journal of Soil Science, in press. doi: 10.1111/ejss.12858 (*corresponding author)
  • Liu X, Cui X, Guo L, Chen J, Li W, Yang D, Cao X, Chen X, Liu Q (2019). Estimating soil water content from coarse root reflections on ground-penetrating radar radargrams. Plant and Soil, 436:623-639. doi: 10.1007/s11104-018-03919-5
  • Li W, Cui X, Guo L, Chen J, Chen X, Cao X (2016). Tree Root Automatic Recognition in Ground Penetrating Radar Profiles Based on Randomized Hough Transform, Remote Sensing, 8(430):1-16. doi: 10.3390/rs8050430
  • Guo L, Wu Y, Chen J, Hirano Y, Tanikawa T, Li W, Cui X (2015). Calibrate the impact of root orientation on root quantification using ground-penetrating radar. Plant and Soil, 395:289-305. doi: 10.1007/s11104-015-2563-9
  • Wu Y, Guo L*, Cui X, Chen J, Cao X, Lin H (2014) Ground-penetrating radar-based automatic reconstruction of three dimensional coarse root system architecture. Plant and Soil, 383:155-172. doi: 10.1007/s11104-014-2139-0 (*equal contribution as first author)
  • Wu Y, Guo L*, Li W, Cui X, Chen J (2014). Comment on: “root orientation can affect detection accuracy of ground-penetrating radar”. Plant and Soil, 380:441-444. doi: 10.1007/s11104-014-2124-7 (*corresponding author)
  • Guo L, Lin H, Fan, Cui X, Chen J (2013). Forward Simulation of Root’s Ground Penetrating Radar Signal: Simulator Development and Validation, Plant and Soil, 372:487-505. doi: 10.1007/s11104-013-1751-8
  • Guo L, Lin H, Fan, Cui X, Chen J (2013). Impact of Root Water Content on Root Biomass Estimation Using Ground Penetrating Radar: Evidence from Forward Simulations and Field Controlled Experiments, Plant and Soil, 371:503-520. doi: 10.1007/s11104-013-1710-4
  • Guo L, Chen J, Cui X, Fan B, Lin H (2013). Application of Ground Penetrating Radar for Root Detection and Quantification: A Review, Plant and Soil, 362:1-23. doi: 10.1007/s11104-012-1455-5
  • Guo L, Cui X, Chen J (2012). Sensitive factors analysis in using GPR for detection plant roots based on forward modeling, Progress in Geophysics, 27:1754-1763. doi: 10.6038/j.issn.1004-2903.2012.04.057
  • Cui X, Guo L, Chen J, Chen X, Zhu X (2012). Estimating tree-root biomass in different depths by ground-penetrating radar: evidences from a controlled experiment, IEEE Transaction on Geoscience and Remote Sensing, 99:1-14. doi: 10.1109/TGRS.2012.2224351


Agricultural Water Management

  • Zhang S, Hopkins I, Guo L, Lin H (2019). Dynamics of infiltration rate and field-saturated soil hydraulic conductivity in a wastewater-irrigated cropland. Water, 11, 1632. doi: 10.3390/w11081632
  • Zhang J, He H, Fan B, Zheng X, Wang Z, Li W, Lin H, Guo L* (2019). Effect of cotton stalks returning to fields on residual film distribution under long-term film mulching and drip irrigation in an oasis agroecosystem. Soil Science Society of America Journal, in press. doi: 10.2136/sssaj2019.04.0128 (*corresponding author)
  • Wang Z, Wu Q, Fan B, Zhang J, Li W, Zheng X, Lin H, Guo L* (2019). Testing biodegradable films as alternatives to plastic films in enhancing cotton (Gossypium hirsutum L.) yield under mulched drip irrigation. Soil & Tillage Research, 192:196-205. doi: 10.1016/j.still.2019.05.004 (*corresponding author)
  • Wang Z, Wu Q, Fan B, Zheng X, Zhang, J, Li W, Guo L* (2019). Effects of drip irrigation mulching with biodegradable film on soil hydrothermal conditions and cotton yield. Agricultural Water Management, 213:477-485. doi:10.1016/j.agwat.2018.10.036 (*corresponding author)
  • Wang Z, Fan B, Guo L* (2019). Soil salinization after long-term mulched drip irrigation poses a potential risk to agricultural sustainability. European Journal of Soil Science, 70: 20-24. doi: 10.1111/ejss.12742 (*corresponding author)
  • He H, Wang Z, Guo L*, Zheng X, Zhang J, Li W, Fan B (2018). Distribution Characteristics of Residual Film over a Cotton Field under Long-term Film Mulching and Drip Irrigation in an Oasis Agroecosystem. Soil & Tillage Research, 180:194-203. doi: 10.1016/j.still.2018.03.013  (*corresponding author)

Climate Change and Remote Sensing of Vegetation

  • Huang Y, Jiang N, Shen M, Guo L* (2020). Effect of preseason diurnal temperature range on the start of vegetation growing season in the Northern Hemisphere. Ecological Indicators, 112:1-9. doi: 10.1016/j.ecolind.2020.106161 (*corresponding author)
  • Guo L, Fan B, Zhang F, Lin H, Jin Z (2018). The clustering of severe dust storm occurrence in China from 1958 to 2007. Journal of Geophysical Research: Atmospheres, 123:8035-8046. doi: 10.1029/2018JD029042
  • Yang Z, Shen M, Jia S, Guo L, Yang W, Wang C, Chen X, Chen J (2017). Asymmetric responses of the end of growing season to daily maximum and minimum temperatures on the Tibetan Plateau. Journal of Geophysical Research: Atmospheres, 121:1-10. doi: 10.1002/2017JD027318
  • Guo L, Wang K, Bluestein H (2016). Variability of Tornado Occurrence over the Continental United States since 1950. Journal of Geophysical Research: Atmospheres, 121:6943–6953. doi: 10.1002/2015JD024465
  • Guo L, An N, Wang K (2016). Reconciling the discrepancy in ground- and satellite-observed trends in the spring phenology of winter wheat in China from 1993 to 2008. Journal of Geophysical Research: Atmospheres, 121:1027-1042. doi: 10.1002/2015JD023969
  • Jia P, Lu L, Chen X, Chen J, Guo L, Yu X, Liu Q (2016). A climate-driven mechanistic population model of Aedes albopictus with diapause. Parasite and Vectors, 9:1-15. doi: 10.1186/s13071-016-1448-y
  • Li N, Guo L, Fan B (2015). A New Perspective on Understanding the Reduced Spring Dust Storm Frequency in Inner Mongolia, China. International Journal of Disaster Risk Science, 6:216-225. doi: 10.1007/s13753-015-0062-5
  • Fan B, Guo L*, Li N, Chen J, Lin H, Zhang X, Shen M, Rao Y, Wang C, Ma L (2014). Earlier vegetation green-up has reduced spring dust storms. Scientific Reports, 4(6749):1-6. doi: 10.1038/srep06749 (*equal contribution as first author)

Ecology and Evolution

  • Jin B, Xu W, Guo L, Chen J, Fu C (2014). The impact of geomorphology of marsh creeks on fish assemblage in Changjiang River estuary, Chinese Journal of Oceanology and Limnology, 32:469-479. doi: 10.1007/s00343-014-3002-0
  • Fu C, Guo L, Xia R, Li J, Lei G (2012). A multilocus phylogeny of Asian noodlefishes Salangidae (Teleostei: Osmeriformes) with a revised classification of the family, Molecular Phylogenetics and Evolution, 62:848-855. doi: 10.1016/j.ympev.2011.11.031
  • Guo L, Li J, Wang Z, Fu C (2011). Phylogenetic relationships of noodle-fishes (Osmeriformes: Salangidae) based on four mitochondrial genes, Acta Hydrobiological Sinica, 35:449-459. doi: 10.3724/SP.J.1035.2011.00449
  • Tang W, Ishimatsu A, Fu C, Yin W, Guo L, Chen H, Wu Q, Li B (2010). Cryptic Species and Historical Biogeography of Eel Gobies (Gobioidei: Odontamblyopus) Along the Northwestern Pacific Coast. Zoological Science, 27:8-13. doi: 10.2108/zsj.27.8
  • Chen Z, Guo L, Jin B, Wu J, Zheng G (2009). Effect of the exotic plant Spartina alterniflora on macrobenthos communities in salt marshes of the Yangtze River Estuary, China. Estuarine Coastal and Shelf Science, 82:265-272. doi: 10.1016/j.ecss.2009.01.014
  • Zhou S, Jin B, Guo L, Qin H, Chu T, Wu J (2009). Spatial distribution of zooplankton in the intertidal marsh creeks of the Yangtze River Estuary, China. Estuarine Coastal and Shelf Science, 85:399-406. doi: 10.1016/j.ecss.2009.09.002
  • Yin W, Fu C, Guo L, He Q, Li J, Jin B, Wu Q, Li B (2009). Species delimitation and historical biogeography in the genus Helice (Brachyura: Varunidae) in the northwestern Pacific. Zoological Science, 26:467-475. doi: 10.2108/zsj.26.467