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John Knowles
Southwest Watershed Research Center
Research Ecologist

Phone: (520) 670-2928
Fax:

2000 E ALLEN RD
TUCSON, AZ 85719

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Convergent hydraulic redistribution and groundwater access supported facilitative dependency between trees and grasses in a semi-arid environment Reprint Icon - (Peer Reviewed Journal)
Lee, E., Kumar, P., Knowles, J.F., Minor, R., Tran, N., Barron-Gafford, G., Scott, R.L. 2021. Convergent hydraulic redistribution and groundwater access supported facilitative dependency between trees and grasses in a semi-arid environment. Water Resources Research. 57(6), Article 028103. https://doi.org/10.1029/2020WR028103.
An improved practical approach for estimating catchment-scale response functions through wavelet analysis Reprint Icon - (Peer Reviewed Journal)
Dwivedi, R., Eastoe, C., Knowles, J.F., Meixner, T., Mcintosh, J., Ferre, P., Castro, C., Wright, W., Niu, G., Minor, R., Barron-Gafford, G., Abramson, N., Mitra, B., Stanley, M., Chorover, J. 2021. An improved practical approach for estimating catchment-scale response functions through wavelet analysis. Hydrological Processes. 35(3), Article e14082. https://doi.org/10.1002/hyp.14082.
Representativeness of Eddy-Covariance flux footprints for areas surrounding AmeriFlux sites Reprint Icon - (Peer Reviewed Journal)
Chu, H., Luo, X., Ouyang, Z., Chan, W., Dengel, S., Biraud, S., Torn, M., Metzger, S., Kumar, J., Arain, M., Arkebauer, T., Baldocchi, D., Bernacchi, D., Black, T., Blanken, P., Bohrer, G., Bracho, R., Brown, S., Brunsell, N., Chen, J., Chen, X., Clark, K., Desai, A., Duman, T., Durden, T., Fares, S., Forbrich, I., Gamon, J., Griffis, T., Helbig, M., Hollinger, D., Humphreys, E., Ikawa, H., Iwata, H., Ju, Y., Knowles, J.F., Knox, S., Kobayashi, H., Kolb, T., Law, B., Lee, X., Litvak, M., Liu, H., Munger, J., Noormets, A., Novick, K., Oberbauer, S., Oechel, W., Oikawa, P., Papuga, S., Pendall, E., Prajapati, P., Prueger, J.H., Quinton, W., Richardson, A., Russell, E., Scott, R.L., Starr, G., Staebler, R., Stoy, P., Stuart-Haëntjens, E., Sonnentag, O., Sullivan, R., Suyker, A., Ueyama, M., Vargas, Wood, J., Zona, D. 2021. Representativeness of Eddy-Covariance flux footprints for areas surrounding AmeriFlux sites. Agricultural and Forest Meteorology. 301-302, Article 108350. https://doi.org/10.1016/j.agrformet.2021.108350.
Representativeness of Eddy-Covariance flux footprints for areas surrounding AmeriFlux sites Reprint Icon - (Peer Reviewed Journal)
Chu, H., Luo, X., Ouyang, Z., Chan, W., Dengel, S., Biraud, S.C., Torn, M.S., Metzger, S., Kumar, J., Arain, M.A., Arkebauer, T.J., Baldocchi, D., Bernacchi, C.J., Knowles, J.F., Prueger, J.H., et al. 2021. Representativeness of Eddy-Covariance flux footprints for areas surrounding AmeriFlux sites. Agricultural and Forest Meteorology. 301-302. Article 108350. https://doi.org/10.1016/j.agrformet.2021.108350.
Hydraulic redistribution buffers climate variability and regulates grass-tree interactions in a semiarid riparian savanna Reprint Icon - (Peer Reviewed Journal)
Barron-Gafford, G.A., Knowles, J.F., Perez Sanchez-Canete, E., Minor, R.L., Lee, E., Sutter, L., Tran, N., Murphy, P., Hamerlynck, E.P., Kumar, P., Scott, R.L. 2020. Hydraulic redistribution buffers climate variability and regulates grass-tree interactions in a semiarid riparian savanna. Ecohydrology. 14(3). Article e2271. https://doi.org/10.1002/eco.2271.
Water availability impacts on evapotranspiration partitioning Reprint Icon - (Peer Reviewed Journal)
Scott, R.L., Knowles, J.F., Nelson, J., Gentine, P., Li, X., Bryant, R.B., Biederman, J.A. 2021. Water availability impacts on evapotranspiration partitioning. Agricultural and Forest Meteorology. 297, Article 108251. https://doi.org/10.1016/j.agrformet.2020.108251.
The Photochemical Reflectance Index (PRI) captures the ecohydrologic sensitivity of a semi-arid mixed conifer forest Reprint Icon - (Peer Reviewed Journal)
Yang, J., Magney, T., Yan, D., Knowles, J.F., Smith, W., Scott, R.L., Barron-Gafford, G. 2020. The Photochemical Reflectance Index (PRI) captures the ecohydrologic sensitivity of a semi-arid mixed conifer forest. Journal of Geophysical Research-Biogeosciences. 125(11), Article 005624. https://doi.org/10.1029/2019JG005624.
Montane forest productivity across a semi-arid climatic gradient Reprint Icon - (Peer Reviewed Journal)
Knowles, J.F., Scott, R.L., Biederman, J.A., Blanken, P., Burns, S., Dore, .S., Kolb, T., Litvik, M., Barron-Gafford, G. 2020. Montane forest productivity across a semi-arid climatic gradient. Global Change Biology. 26(12):6945-6958. https://doi.org/10.1111/gcb.15335.
Topography influences species-specific patterns of seasonal primary productivity in a semiarid montane forest Reprint Icon - (Peer Reviewed Journal)
Murphy, P., Knowles, J.F., Moore, D., Anchukaitis, K., Potts, D., Barron-Gafford, G. 2020. Topography influences species-specific patterns of seasonal primary productivity in a semiarid montane forest. Tree Physiology. 40(10:1343-1354. https://doi.org/10.1093/treephys/tpaa083.
Ubiquitous fractal scaling and filtering behavior of hydrologic fluxes and storages from a mountain headwater catchment Reprint Icon - (Peer Reviewed Journal)
Dwivedi, R., Knowles, J.F., Eastoe, C., Minor, R., Abramson, N., Mitra, B., Wright, W., Mcintosh, J., Meixner, T., Ferre, P., Castro, C., Nie, G., Barron-Gafford, G., Chorover, J. 2020. Ubiquitous fractal scaling and filtering behavior of hydrologic fluxes and storages from a mountain headwater catchment. Water. 12. https://doi.org/10.3390/w12020613.
Ecosystem carbon and water cycling from a sky island montane forest Reprint Icon - (Peer Reviewed Journal)
Knowles, J.F., Scott, R.L., Minor, R., Barron-Gafford, G. 2020. Ecosystem carbon and water cycling from a sky island montane forest. Agricultural and Forest Meteorology. 281. https://doi.org/10.1016/j.agrformet.2019.107835.
Vegetation source water identification using isotopic and hydrometric observations from a subhumid mountain catchment Reprint Icon - (Peer Reviewed Journal)
Dwivedi, R., Eastoe, C., Knowles, J.F., Wright, W., Hamann, L., Minor, R., Mitra, B., Meixner, T., Mcintosh, J., Ferre, P., Castro, C., Niu, G., Barron Gafford, G., Abramson, N., Papuga, S., Stanley, M., Hu, J., Chorover, J. 2020. Vegetation source water identification using isotopic and hydrometric bservations from a subhumid mountain catchment. Ecohydrology. 13(1). https://doi.org/10.1002/eco.2167.
Remote sensing of dryland ecosystem structure and function: Progress, challenges and opportunities Reprint Icon - (Peer Reviewed Journal)
Smith, W., Dannenberg, M., Yan, D., Hermann, S., Barnes, M., Barron-Gafford, G., Biederman, J.A., Ferrenberg, S., Fox, A., Hudson, A., Knowles, J.F., Macbean, N., Moore, D., Nagler, P., Reed, S., Rutherford, W., Scott, R.L., Wng, X., Yang, J. 2019. Remote sensing of dryland ecosystem structure and function: Progress, challenges and opportunities. Remote Sensing of Environment. 233. https://doi.org/10.1016/j.rse.2019.111401.