tailieunhanh - Báo cáo lâm nghiệp: "Components of woody-tissue respiration in Abies amabilis"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Components of woody-tissue respiration in Abies amabilis. | 532s Ann. Sci. For. 1989 46 suppl. 532s-535s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Components of woody-tissue respiration in Abies amabilis . Sprugel College of Forest Resources AR-10 University of Washington Seattle WA 98195 . Introduction Although respiration has long been recognized as an important component of plant energy budgets whole-plant respiration under field conditions has rarely received the attention one might expect for a process that may consume up to 80 of gross primary production Whittaker 1975 . As a result there are some significant inconsistencies among the well-known facts about respiration. Kramer and Kozlowski 1979 noted that stem respiration is concentrated in the cambial region and inferred that it would be expected that a forest stand consisting of a small number of trees of large diameter would have a more efficient ratio of photosynthesis to respiration than a stand of the same basal area composed of trees of smaller diameter . This suggests that the surface area of a tree or stand is the primary determinant of its woody-tissue respiration. Kira and Shidei 1967 however thought that woody-tissue respiration was primarily determined by biomass saying the biomass of woody organs. increases monotonously with age and hence the amount of organic matter consumed by the respiration of woody organs might follow the same course of increase . The purpose of this study was to determine what morphological and physiological factors are correlated with respiration rate in young Abies amabilis trees and to estimate annual woody-tissue respiration by component for a 30 yr old A. amabilis stand. Study site and Methods The site for this study was a 30 yr old A. ama-bilis Pacific silver fir stand about 65 km southeast of Seattle WA in the Findley Lake research area on the City of Seattle s Cedar River watershed. The trees range from 1 to 6 m in height with diameters from 1 to 14 cm. Respiration measurements were made on 12 .

TÀI LIỆU LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.