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On the distribution and dynamics of ...

Kerkhoff, Andrew Joseph.

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On the distribution and dynamics of vegetation: From ecohydrology to life history.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	On the distribution and dynamics of vegetation: From ecohydrology to life history./
作者:	Kerkhoff, Andrew Joseph.
面頁冊數:	115 p.
附註:	Adviser: Bruce T. Milne.
Contained By:	Dissertation Abstracts International63-02B
標題:	Biology, Ecology -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3041808
ISBN:	049355257X

On the distribution and dynamics of vegetation: From ecohydrology to life history.
Kerkhoff, Andrew Joseph.

On the distribution and dynamics of vegetation: From ecohydrology to life history. - 115 p.

Adviser: Bruce T. Milne.

Thesis (Ph.D.)--The University of New Mexico, 2002.

The distribution and dynamics of vegetation are affected by environmental variability in both space and time, across levels of organization from individual plants to ecological landscapes. This research focuses on biophysical constraints on the spatial distribution of tree patches in a semiarid woodland mosaic, and the influence of temporal variability on the life histories of perennial plants. Using an analytical water-balance model, I find that the sensitivity of transpiration to soil moisture availability gives plants an influential and complex role in the net annual fluxes of water in semiarid ecosystems. The overly simple physiological assumptions of the water-balance model result in anomalous, unrealistic predictions of average soil moisture availability and canopy density. Using high-resolution (1 m), remotely sensed tree cover data and spatially explicit estimates of water-balance parameters, I find that the distribution of trees is contingently related to biophysical gradients. Residual variation in canopy density is significantly related to the density of trees in the local neighborhood, implying that patches may be recruitment limited. Woodland trees exhibit pronounced masting, producing large cone crops only once every 4–10 yr. To explore masting phenomena more generally, I develop a dynamic model of reproductive allocation in trees, incorporating allometric growth principles and stochastic resource environments. The model reproduces five of the six patterns associated with masting, even in relatively stable environments. While most evolutionary explanations for masting invoke economies of scale, these results suggest that masting may simply be an epiphenomenon of life history evolution in variable environments. The distribution and dynamics of vegetation entail a large number of biotic and abiotic interactions at many scales of time and space. The development of fundamental theory in ecology thus requires multiple, complementary research approaches

ISBN: 049355257XSubjects--Topical Terms:

1260331
Biology, Ecology

On the distribution and dynamics of vegetation: From ecohydrology to life history.
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