Walker Lab
Disturbance and Ecosytem Ecology


The following is a selection of publications. For more information please visit Xanthe Walker’s Google Scholar

Walker XJ, Okano K, Berner LT, Massey R, Goetz SJ, Johnstone JFJ, Mack MC (2023). Shifts in Ecological Legacies Support Hysteresis of Stand Type Conversions in Boreal Forests. Ecosystems. https://doi.org/10.1007/s10021-023-00866-w

Walker XJ, Alexander HD, Berner L, Boyd M, Loranty MM, Natali S, Mack MC (2021) Positive response of tree productivity to warming is reversed by increased tree density at the Arctic tundra-taiga ecotone. Canadian Journal of Forest Research. doi:10.1139/cjfr-2020-0466

Walker XJ, Howard BK, Jean M, Johnstone JF, Roland C, Rogers BM, Schuur EAG, Solvik KK, Mack MC (2021) Impacts of pre-fire conifer density and wildfire severity on ecosystem structure and function at the forest-tundra ecotone. PLOS ONE https://doi.org/10.1371/journal.pone.0258558

Mack MC, Walker XJ, Johnstone JF, Alexander HD, Melvin AM, Jean M, Miller, SN (2021) Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees. Science 372 (6539), 280-283.

Walker XJ, Roger BM, Veraverbeke S, Johnstone JF, Baltzer JL, Barrett K, Bourgeau-Chavez L, Day NJ, de Groot WJ, Dieleman CM, Goetz S, Hoy E, Jenkins LK, Kane ES, Parisien MA, Potter S, Schuur EAG, Turetsky M, Whitman E, Mack MC (2020) Fuel availability not fire weather controls boreal wildfire severity and carbon emissions. Nature Climate Change. 1–7. doi:10.1038/s41558-020-00920-8.

Walker XJ, Baltzer JL, Bourgeau-Chavez L, Day NJ, Dieleman CM, Johnstone JF, Kane ES, Rogers BM, Turetsky MR, Veraverbeke S, Mack MC (2020) Patterns of Ecosystem Structure and Wildfire Carbon Combustion Across Six Ecoregions of the North American Boreal Forest. Frontiers in Forests and Global Change 3, 87.

Walker XJ, Baltzer JL, Day NJ, Ebert C, Goetz SJ, Johnstone JF, Potter S, Rogers BM, Schuur EAG, Turetsky MR, Mack MC (2019) Increasing wildfires threaten historic carbon sink of boreal forest soils. Nature. 572, 520–523. doi:10.1038/s41586-019-1474-y

Walker XJ, Rogers BM, Baltzer JL, Cumming SG, Day NJ, Goetz S, Johnstone JF, Schuur EAG, Turetsky MR, Mack MC (2018) Cross-scale controls on carbon emissions from boreal forest mega-fires. Global Change Biology, 24, 4251– 4265. doi:10.1111/gcb.14287

Walker XJ, Baltzer JL, Cumming SG, Day NJ, Johnstone JF, Rogers BM, Solvik K, Turetsky MR, Mack MC (2018) Soil organic layer combustion in boreal black spruce and jack pine stands of the Northwest Territories, Canada. International Journal of Wildland Fire 27, 125–134. doi:10.1071/WF17095.

Walker XJ, Frey MD, Conway AC, Jean M, Johnstone JF (2017) Impacts of fire on non-native plant recruitment in black spruce forests of Interior Alaska. PLoS ONE 12(2): e0171599. doi:10.1371/journal.pone.0171599

Walker XJ, Johnstone JF, Mack MC (2016) Predicting ecosystem resilience to fire from tree ring analysis in black spruce forests. Ecosystems, 20, 1137–1150. doi:10.1007/s10021-016-0097-5

Walker XJ, Mack MC, Johnstone JF (2015) Stable carbon isotope analysis reveals widespread drought stress in boreal black spruce forests. Global Change Biology 21, 3102–3113. doi:10.1111/gcb.12893.

Walker XJ, Johnstone JF (2014) Widespread negative correlations between black spruce growth and temperature across topographic moisture gradients in the boreal forest. Environmental Research Letters 9, 064016.

Walker XJ, Henry GHR, McLeod K, Hofgaard A (2012) Reproduction and seedling establishment of Picea glauca across the northernmost forest-tundra region in Canada. Global Change Biology 18, 3202–3211. doi:10.1111/j.1365-2486.2012.02769.x.