Research Associate (Andrew Black)

phone: 6048229119
phone: 6048222184
MacMillan 129
2357 Main Mall
Vancouver, BC V6T 1Z4

Selected Publications

Jassal, R.S., Black, T.A., Trofymow, A.J., Roy, R., Nesic, Z., 2009. Forest-floor CO2 and N2O flux dynamics in a nitrogen-fertilized Pacific Northwest Douglas-fir stand. Soil Biology and Biochemistry, submitted.

Cai, T., Black, T.A., Jassal, R.S., Morgenstern, K., Nesic, Z. 2009. Incorporating diffuse photosynthetically active radiation in a single-leaf model of canopy photosynthesis for a 56-year-old coastal Douglas-fir stand. International Journal of Biometeorology, DOI 10.1007/s00484-008-0196.x

Jassal, R.S., Black, T.A., Spittlehouse, D., Brümmer, C., Nesic, Z. 2009. Evapotranspiration and water use efficiency in Pacific Northwest Douglas-fir stands of different ages following clearcut harvesting. Agricultural and Forest Meteorology, AGRFORMET-D-08-00277, accepted.

Arevalo, C., Bhatti, J.S., Chang, S., Jassal, R.S., Sidders, D. 2009. Soil respiration in four different land use systems in north central Alberta, Canada. Global Change Biology, submitted.

Krishnan, P., Black, T.A., Jassal, R.S., Nesic, Z. 2009. Interannual variability in the carbon balance of three different-aged Pacific Northwest Douglas-fir stands. Journal of Geophysical Research-Biogeosciences, submitted.

Jassal, R.S., Black, T.A., Chen, B., Nesic, Z., Roy, R., Spittlehouse, D., Trofymow, A.J. 2008. N2O emissions and carbon sequestration in a nitrogen-fertilized Douglas-fir stand. Journal of Geophysical Research-Biogeosciences 113, doi:10.1029/2008JG000764.

Black, T.A., Jassal, R.S., Fredeen, A. 2008. Carbon sequestration in British Columbia�s forests and management options: A White Paper on Forestry. Pacific Institute for Climate Solutions, Vitoria BC, 19 p.

Chen, B., Black, T.A., Nicholas, C., Jassal, R., Brümmer, C., Nesic, Z. 2008. Seasonal controls on interannual variability in carbon dioxide exchange of a near-end-of rotation Douglas-fir stand in the Pacific Northwest. Global Change Biology, accepted.

Jassal, R.S., Black, T.A., Novak, M.D., Gaumont-Guay, Nesic, Z. 2008. Effect of soil water stress on soil respiration and its temperature sensitivity in an 18-year-old temperate Douglas-fir stand.Global Change Biology, 14, 1-14.

Cai, T., Flanagan, L., Jassal, R.S., Black, T.A. 2008. Modeling environmental and ecological controls on the carbon isotope composition of ecosystem respired CO2 in a coastal Douglas-fir forest.Plant Cell and Environment, 31, 435-453.

Hilker, T., Coops, N.C., Schwalm, C., Jassal, R.S., Black, T.A., Krishnan, P. 2008. Effects of Mutual Shading of Tree Crowns on Prediction of Photosynthetic Light Use Efficiency in a Coastal Douglas-fir Forest. Tree Physiology, 28, 825-834.

Jassal, R.S., Black, T.A., Cai, T., Morgenstern, K., Li, Z., Gaumont-Guay, D., Nesic, Z. 2007. Components of ecosystem respiration and estimates of net primary productivity of an intermediate-aged Douglas-fir stand. Agricultural and Forest Meteorology, 144, 44-57.

Coops, N.C., Jassal, R.S., Leuning, R., Black, T.A., Morgenstern, K. 2007. Incorporation of a soil water modifier into MODIS predictions of temperate Douglas-fir gross primary productivity: Initial model development. Agricultural and Forest Meteorology, 147, 99-109.

Coops, N.C., Black, T.A., Jassal, R.S., Trofymow, J.A., Morgenstern, K. 2007. Comparison of MODIS, Eddy covariance determined and physiologically modelled gross primary production (GPP) in a Douglas-fir forest stand. Remote Sensing of Environment, 107, 385-401.

Jassal, R.S., Black, T.A. 2006. Estimating heterotrophic and autotrophic soil respiration using small-area trenched plot technique: Theory and practice. Agricultural and Forest Meteorology, in press.

Jassal, R.S., Black, T.A., Novak, M.D., Morgenstern, K, Nesic, Z., Gaumont-Guay, D. 2005. Relationship between soil CO2 concentrations and forest-floor CO2 effluxes. Agricultural and Forest Meteorology 130, 176-192.

Drewitt, G., Black, T.A., Jassal, R.S. 2005. Using measurements of soil CO2 efflux and concentration to infer the depth distribution of CO2 production in a forest soil. Canadian Journal of Soil Science85, 213-221.

Black, T.A., Gaumont_Guay, D., Jassal, R.S., Amiro, B.D., Jarvis, P.G., Gower, S.T., Kelliher, F.M. 2005. Measurement of carbon dioxide exchange between the boreal forest and the atmosphere; pp 151-185 In The Carbon Balance of Forest Biomes, Griffiths, H., Jarvis, P.G. (eds.), Taylor & Francis Group, New York.

Jassal, R.S., Black, T.A., Drewitt, G.B., Gaumont-Guay, D., Novak, M.D., Nesic, Z. 2004. A model of the production and transport of CO2 in soil: Predicting the CO2 efflux from a forest-floor and influences of soil water content and temperature. Agricultural and Forest Meteorology 124, 219-236.

Jassal, R.S., Novak, M.D., Black, T.A. 2003. Effect of surface layer thickness on simultaneous transport of heat and water in a bare soil and its implications for land surface schemes. Atmosphere-Ocean 41, 259-272.

Hira, G.S., Rachhpal-Singh and Kukal, S.S. 2002. Soil matric suction: a criterion for scheduling irrigation to rice (Oryza sativa L.). Indian Journal of Agricultural Sciences 74(4), 235-236.

Raj-Kumar, Rachhpal-Singh, Singh, N.T., Ahuja, R.L. 2001. Long-term soil management systems and the alkali soils of the semi-arid sub-tropical India. Arid Land Research & Management 15, 1-8.

Rachhpal-Singh, Kukal, S.S., Singh, K, Roopna. 2001. Interactive effects of dry and wet tillage in rice on puddle quality, water expense, weed infestation and rice yield on a sandy loam soil in Punjab. Indian Journal of Agricultural Sciences 71(10), 668-671.

Gajri, P.R., Gill, K.S., Rachhpal-Singh and Gill, B.S. 1999. Effect of pre-puddling tillage on crop yields in a rice-wheat system on a sandy loam soil. Soil & Tillage Research 52, 83-89

Mukhopadhyay, R., Gajri, P.R., Rachhpal-Singh and Khera, K.L. 1997. Erosion and crust management in coarse textured soils with an acrylic based soil conditioner. Arid Soils Research & Rehabilitation 11(3), 367-374.

Rachhpal-Singh, Gajri, P.R., Gill, K.S. and Khera, R. 1995. Puddling intensity and nitrogen-use efficiency of rice (oriza sativa) on a sandy loam soil of Punjab. Indian Journal of Agricultural Sciences 65, 47-50

Rachhpal‑Singh and G.J.D. Kirk. 1993. A model of the fate of fertilizer nitrogen in lowland rice fields: I. Model Development. Journal of Soil Science 44, 285-298.

Rachhpal‑Singh and G.J.D. Kirk. 1993. A model of the fate of fertilizer nitrogen in lowland rice fields: II. Predicted dynamics of inorganic carbon, nitrogen and acidity in the soil and floodwater. Journal of Soil Science 44, 271-284.

Kirk, G.J.D. and Rachhpal-Singh. 1992. Simultaneous transfer across an air-water interface of gases that interact through acid-base reactions. Atmospheric Environment. 26A, 1651-1660

Rachhpal-Singh. 1989. Effect of organic residues and method of nitrogen application on wheat yield in a slowly permeable fine textured soil. Indian Journal of Ecolology 16, 91-92.

Rachhpal‑Singh. 1987. Predicting the effect of soil‑water-air dynamics on ammonia volatilization from applied urea with a mechanistic model. Fertilizer Research 13, 277‑285.

Rachhpal‑Singh and Nye, P.H. 1986. A model of ammonia volatilization from applied urea. I. Development of the Model, II. Experimental Testing, III. Sensitivity Analysis. Journal of Soil Science 37, 9‑20, 21-29, 31-40.

Rachhpal‑Singh and Nye, P.H. 1984. The effect of soil‑pH and high urea concentrations on urease activity in soil. Journal of Soil Science 35, 519‑527.

Additional Information

I joined the Biometeorology & Soil Physics group in January 2002 when I had moved to Vancouver from India. I received my D.Phil. degree from the University of Oxford in England in 1984 and my thesis was on modelling the movement of urea and its transformation products (N species and alkalinity) in soil. From 1985 to 1989 and 1992 to 2001, I was a Soil Scientist at the Punjab Agricultural University in India, where my main interests were soil-water plant relationships and management of problem soils (salt affected, highly permeable coarse textured, and very slowly permeable clays). During 1990-1992, I was a Visiting Scientist at the International Rice Research Institute in Philippines, where I worked on a model of the fate of fertilizer N in submerged soils and simultaneous transfer of CO2 and NH3 across an air-water interface.

While at UBC, I started with modeling the coupled transport of soil heat and water and the surface energy balance components. My current interests are measurements and modeling of soil CO2concentrations and effluxes in relation to soil and environmental variables, effect of forest management on carbon sequestration, greenhouse gas emissions and net global warming potential.

I have published more than 80 research papers, including 2 reviews and 3 book chapters and a White Paper on Forestry.