Treesearch

Current knowledge of erosional processes in mountainous watersheds is reviewed with emphasis on the west coast of the United States. Appreciation of the relative magnitude of erosional processes may be distorted by the tendency for researchers to study ""problems"" and by the relatively short time span of their records

Plant roots can contribute significantly to the stability of steep slopes. They can anchor through the soil mass into fractures in bedrock, can cross zones of weakness to more stable soil, and can provide interlocking long fibrous binders within a weak soil mass. In deep soil, anchoring to bedrock becomes negligible, and lateral reinforcement predominates

To assess the influence of road building and logging on storm flow response, a pair of watersheds were studied at Caspar Creek near Fort Bragg in northern California from 1963 to 1975. Selection cutting and tractor yarding of 85-year-old second-growth redwood and Douglas-fir forest did not significantly affect large peak streamflows. The first streamflow peaks in the fall, however, were increased about 300% after logging. These early fall storms produced small peaks, which had little, if any, hydraulic consequence. The effect of logging on peak flow was best predicted by a variable...

In this commentary I will be discussing the acquisition and transfer of scientific information. As I perceive it, those tasks are the principal business of all of us attending this symposium. I have come to the conclusion based on my review of Theme 3 papers, that many of us are not fulfilling our obligations as scientists as adequately as we ought to when we set about to acquire new information and report it to our peers

Seedlings of six full-sib families of loblolly pine were grown outdoors in clay pots for two growing seasons. Dark respiration of shoot and root and CO2 exchange of the shoot in the light were measured periodically over a temperature range bracketing ambient conditions. Both shoot and root showed different physiological responses as seasonal temperature changed, but differences among crosses were not apparent. Optimum temperatures for net photosynthesis shifted with seasonal temperatures from a high of nearly 25 C in midsummer to a low of 10 C in midwinter. Root respiration was higher at...