Adrian Das
I am an Ecologist with the U.S. Geological Survey's Western Ecological Research Center, stationed at Sequoia and Kings Canyon National Parks. I study tree dynamics with a particular focus on tree mortality processes. My work is aimed at improving our understanding of western forests and increasing our capacity to assess how they will be affected by a changing climate.
RESEARCH INTERESTS
- Forest ecology
- Forest dynamics
- Tree mortality
- Tree growth
- Climatic change
Education and Certifications
PhD from University of California at Berkeley, Forest Ecology 2007
BS from University of Michigan, Chemistry and Cellular Molecular Biology, 1995
Science and Products
Filter Total Items: 14
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The effect of size and competition on tree growth rate in old-growth coniferous forests
Tree growth and competition play central roles in forest dynamics. Yet models of competition often neglect important variation in species-specific responses. Furthermore, functions used to model changes in growth rate with size do not always allow for potential complexity. Using a large data set from old-growth forests in California, models were parameterized relating growth rate to tree size and
Authors
Adrian Das
Comment on "Changes in climatic water balance drive downhill shifts in plant species' optimum elevations"
Crimmins et al. (Reports, 21 January 2011, p. 324) attributed an apparent downward elevational shift of California plant species to a precipitation-induced decline in climatic water deficit. We show that the authors miscalculated deficit, that the apparent decline in species’ elevations is likely a consequence of geographic biases, and that unlike temperature changes, precipitation changes should
Authors
Nathan L. Stephenson, Adrian J. Das
The contribution of competition to tree mortality in old-growth coniferous forests
Competition is a well-documented contributor to tree mortality in temperate forests, with numerous studies documenting a relationship between tree death and the competitive environment. Models frequently rely on competition as the only non-random mechanism affecting tree mortality. However, for mature forests, competition may cease to be the primary driver of mortality.We use a large, long-term da
Authors
A. Das, J. Battles, N.L. Stephenson, Phillip J. van Mantgem
The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada
We examined mortality of Abies concolor (Gord. & Glend.) Lindl. (white fir) and Pinus lambertiana Dougl. (sugar pine) by developing logistic models using three growth indices obtained from tree rings: average growth, growth trend, and count of abrupt growth declines. For P. lambertiana, models with average growth, growth trend, and count of abrupt declines improved overall prediction (78.6% dead t
Authors
A.J. Das, J. J. Battles, N.L. Stephenson, P. J. van Mantgem
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 52
The effect of size and competition on tree growth rate in old-growth coniferous forests
Tree growth and competition play central roles in forest dynamics. Yet models of competition often neglect important variation in species-specific responses. Furthermore, functions used to model changes in growth rate with size do not always allow for potential complexity. Using a large data set from old-growth forests in California, models were parameterized relating growth rate to tree size and
Authors
Adrian Das
Comment on "Changes in climatic water balance drive downhill shifts in plant species' optimum elevations"
Crimmins et al. (Reports, 21 January 2011, p. 324) attributed an apparent downward elevational shift of California plant species to a precipitation-induced decline in climatic water deficit. We show that the authors miscalculated deficit, that the apparent decline in species’ elevations is likely a consequence of geographic biases, and that unlike temperature changes, precipitation changes should
Authors
Nathan L. Stephenson, Adrian J. Das
The contribution of competition to tree mortality in old-growth coniferous forests
Competition is a well-documented contributor to tree mortality in temperate forests, with numerous studies documenting a relationship between tree death and the competitive environment. Models frequently rely on competition as the only non-random mechanism affecting tree mortality. However, for mature forests, competition may cease to be the primary driver of mortality.We use a large, long-term da
Authors
A. Das, J. Battles, N.L. Stephenson, Phillip J. van Mantgem
The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada
We examined mortality of Abies concolor (Gord. & Glend.) Lindl. (white fir) and Pinus lambertiana Dougl. (sugar pine) by developing logistic models using three growth indices obtained from tree rings: average growth, growth trend, and count of abrupt growth declines. For P. lambertiana, models with average growth, growth trend, and count of abrupt declines improved overall prediction (78.6% dead t
Authors
A.J. Das, J. J. Battles, N.L. Stephenson, P. J. van Mantgem