The ponderosa pine ecosystem and environmental stress: past, present and future.
نویسندگان
چکیده
منابع مشابه
Soil pH trends in a sagebrush meadow and Ponderosa pine ecosystem
1. The acidification effect of Ponderosa pine (Pinus ponderosa) needles on soil pH was tested by sampling and measuring pH of soil in areas with ponderosa pine needle litter and without. 2. A total of three depth classes for five samples in each category of pine needles present and absent were collected and analyzed. 3. Statistical analysis of pH data did not indicate statistically significant ...
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متن کاملAn evaluation of ozone exposure metrics for a seasonally drought-stressed ponderosa pine ecosystem.
Ozone stress has become an increasingly significant factor in cases of forest decline reported throughout the world. Current metrics to estimate ozone exposure for forest trees are derived from atmospheric concentrations and assume that the forest is physiologically active at all times of the growing season. This may be inaccurate in regions with a Mediterranean climate, such as California and ...
متن کاملPonderosa Pine, Mixed Conifer, and Spruce-fir Forests
Before European settlement of the interior west of the United States, coniferous forests of this region were influenced by many disturbance regimes, primarily fires, insects, diseases, and herbivory, which maintained a diversity of successional stages and vegetative types across landscapes. Activities after settlement, such as fire suppression, grazing, and logging significantly altered these d...
متن کاملRapid Increase in Log Populations in Drought-Stressed Mixed-Conifer and Ponderosa Pine Forests in Northern Arizona
Down logs provide important ecosystem services in forests and affect surface fuel loads and fire behavior. Amounts and kinds of logs are influenced by factors such as forest type, disturbance regime, forest management, and climate. To quantify potential short-term changes in log populations during a recent globalclimate-change type drought, we sampled logs in mixed-conifer and ponderosa pine (P...
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ورودعنوان ژورنال:
- Tree physiology
دوره 21 5 شماره
صفحات -
تاریخ انتشار 2001