Nutrient Mineralization Processes in Mediterranean-Type Ecosystems1
نویسنده
چکیده
Research Professor of Ecology, Systems Ecology Research Group, San Diego State University, San Diego, California 92182 Abstract: The objective of this paper is to assess the role of mineralization processes (pyrolysis, decomposition, and weathering) on nutrient (N, P, K, Ca, Mg, and S) release in mediterranean-type ecosystems. Decomposition is the most important process for N release. Decomposition and pyrolysis are both significant in the release of K, Ca, and Mg. Too little is known concerning the mineralization of P and S to allow generalizations. Also, generalizations about weathering are difficult because of the high site specificity of nutrient release through weathering. Environment is as important as substrate in estimating mineralization rates; these mineralization rates should be more sensitive to moisture than to temperature fluctuations.
منابع مشابه
Assessing the Effects of Management Actions on Soils and Mineral Cycling in Mediterranean Ecosystems1
Supervisory Soil Scientist, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station located at the Station's Research Work Unit at Tempe, in cooperation with Arizona State University. Headquarters is in Fort Collins, in cooperation with Colorado State University. Abstract: Mediterranean ecosystems can be harvested, undergo type conversion, or be burned. Both wildfires and prescr...
متن کاملNutrients and Water Relations in Mediterranean-Type Ecosystems1
The broad correspondence between the sclerophyllous shrub form and the climate in mediterranean-type ecosystems indicates a climatic control over the vegetation particularly with respect to the summer drought, but all five regions are noted for nutrient deficiencies, especially Australia and South Africa. As studies of these ecosystems are completed, divergences related to the control of commun...
متن کاملDecadal-scale dynamics of water, carbon and nitrogen in a California chaparral ecosystem: DAYCENT modeling results
The Mediterranean climate, with its characteristic of dry summers and wet winters, influences the hydrologic and microbial processes that control carbon (C) and nitrogen (N) biogeochemical processes in chaparral ecosystems. These biogeochemical processes in turn determine N cycling under chronic N deposition. In order to examine connections between climate and N dynamics, we quantified decadal-...
متن کاملApplied and Basic Research in Mediterranean- Climate Ecosystems1
Professor of Biology, Stanford University, Stanford, California 94305 USA Abstract: Man's impact on ecosystems has become so pervasive that there is now little distinction between basic and applied ecological research. Still, the available research results are often inadequate to translate into management policy. The use of an international network of ecosystem study sites in which researchers ...
متن کاملNitrogen mineralization in a high altitude ecosystem in the mediterranean phytogeographical region of Turkey.
Interrelations exist in the terrestrial ecosystems between the plant type and characteristics of nutrient uptake. Annual net nitrogen mineralization in soils of different plant communities in the high altitude zone of Spil mountain located in the Mediterranean phytogeographical region of Turkey was investigated throughout one year by field incubation method. Seasonal fluctuations resulting from...
متن کامل