In response to limited availability of soil resources in basal root zone, plant extends its roots into nearby resource-rich zones to fulfill essential resource demands for survival and reproduction. This root prolifer...In response to limited availability of soil resources in basal root zone, plant extends its roots into nearby resource-rich zones to fulfill essential resource demands for survival and reproduction. This root proliferation into that enriched zones occupied by other plants constitutes interplant overlapping rooting zones and thereby the overlapping depletion zones, causing reduction in resource uptake by neighboring plants. By incorporating this mechanism into the classic resource competition model, we study interplant direct competition through their rooting system in an overlapping depletion zone. The model results indicate an extension of Tilman’s R* rule that has already been proved true when plants compete indirectly through their effect on shared resources. The results reveal that plant’s direct competitive ability (i.e., the ability to occupy an overlapping depletion zone by excluding others) can be characterized by its R*-value, where a best competitor having lowest R*-value excludes others from an overlapping zone and occupies the zone by depleting the resource level to the lowest as in its non-overlapping depletion zone. By analyzing the model, we find a suite of traits that confers R* variation among directly competing plants. This suite of traits would be a useful proxy measure for R* that do not necessarily require to establish equilibrium field monoculture—a requirement for R* measurement in the field.展开更多
Since the conception of sustainable development was advanced. its basic meaning has been extensively accepted. Sustainable development is a focus that all social circles pay close attention to In general, sustainable ...Since the conception of sustainable development was advanced. its basic meaning has been extensively accepted. Sustainable development is a focus that all social circles pay close attention to In general, sustainable development is to satisfy the needs of contemporary era. but not to damage the requirement of later generations. It is quite evident that we should correctly handle the issues of interera retationship. In this paper, the authors have made a preliminaly approach to the inter-ere fair by calculating the coordinated degree of a city and accounting the resources' depletion.展开更多
基金supported by the U.S.National Science Foundation’s Biocomplexity Program (DEB-0421530)LTER Program (DEB0620482)
文摘In response to limited availability of soil resources in basal root zone, plant extends its roots into nearby resource-rich zones to fulfill essential resource demands for survival and reproduction. This root proliferation into that enriched zones occupied by other plants constitutes interplant overlapping rooting zones and thereby the overlapping depletion zones, causing reduction in resource uptake by neighboring plants. By incorporating this mechanism into the classic resource competition model, we study interplant direct competition through their rooting system in an overlapping depletion zone. The model results indicate an extension of Tilman’s R* rule that has already been proved true when plants compete indirectly through their effect on shared resources. The results reveal that plant’s direct competitive ability (i.e., the ability to occupy an overlapping depletion zone by excluding others) can be characterized by its R*-value, where a best competitor having lowest R*-value excludes others from an overlapping zone and occupies the zone by depleting the resource level to the lowest as in its non-overlapping depletion zone. By analyzing the model, we find a suite of traits that confers R* variation among directly competing plants. This suite of traits would be a useful proxy measure for R* that do not necessarily require to establish equilibrium field monoculture—a requirement for R* measurement in the field.
文摘Since the conception of sustainable development was advanced. its basic meaning has been extensively accepted. Sustainable development is a focus that all social circles pay close attention to In general, sustainable development is to satisfy the needs of contemporary era. but not to damage the requirement of later generations. It is quite evident that we should correctly handle the issues of interera retationship. In this paper, the authors have made a preliminaly approach to the inter-ere fair by calculating the coordinated degree of a city and accounting the resources' depletion.
