Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Physiology and metabolism of ectomycorrhizae. | 697s Ann. Sci. For. 1989 46 suppl. 697s-705s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Physiology and metabolism of ectomycorrhizae c. Bledsoe1 D. Brown1 M. Coleman1 w. Littke2 p. Rygiewicz3 u. Sangwanit4 s. Rogers5 and J. Ammirati5 1 College of Forest Resources AR-10 University of Washington Seattle WA 98195 . 2 Weyerhaeuser Corp. Centralia WA . 3 USEPA Corvallis OR . 4 Forest Biology Kasetsart University Bangkok Thailand and 5 Botany Dept. University of Washington Seattle WA . Introduction Managed forests are the forests of today. In these forests growth and yield are improved by forest fertilization. Application of fertilizers often nitrogen has created a need for more understanding of how mineral nutrients roots and soils interact. This need has produced new partnerships among forest soil scientists root physiologists soil microbiologists tree nutritionists and mycorrhizal research workers. The study of mycorrhizae is a critical interface in understanding the processes by which nutrients are transferred from the soil through fungal hyphae into roots then metabolized and distributed throughout the tree. This interface between root and fungus is illustrated in Fig. 1. The following is a discussion of ectomy-corrhizal fungal physiology and its effects on coniferous trees particularly effects on nutrient uptake tree nutrition and water stress. This discussion focuses on 10 years of research conducted by our mycorrhizal group in forestry at the University of Washington. Our research program has focused on two central questions How do ectomycorrhizal fungi affect processes of nutrient uptake by forest tree species And do fungal species differ in their abilities to affect physiological processes in general Nutrient uptake and metabolism Inorganic nitrogen uptake Inorganic ammonium and nitrate are assumed to be the major forms in which nitrogen is taken up by tree roots. Forest soils generally contain more ammonium than nitrate .
