Growth and Yield of Douglas-fir & Western Hemlock in Pure and Mixed Planted Stands: Results at Age 12 from the Smc Type Iii Trials
نویسنده
چکیده
VII Chapter 1: Introduction 1 Chapter 2: Objectives and Hypotheses 3 Chapter 3: Methodology 5 A. Experimental sites 5 B. Experimental Design 5 C. Measurements and Field Data Collection 6 D. Data Analysis 6 Chapter 4: Results 11 A. General 11 B. Patterns of height growth 11 C. Patterns of diameter growth 14 D. Height – Diameter Ratio 16 E. Crown development 16 F. Individual tree volume growth 17 G. Basal Area per acre accumulation 19 H. Volume per acre accumulation 21 I. Productivity: Periodic and Annual Increments 22 J. Relative Yield analysis 23 Chapter 5: Discussion 27 A. Height growth pattern and stratification 27 B. Interspecific and Intraspecific competition 27 C. Overall Stand Productivity: Pure vs. Mixed stands 28 D. Density and its effects on species interactions and productivity 29 Chapter 6: Conclusions 31
منابع مشابه
Thinning Mixed-Species Stands of Douglas-Fir and Western Hemlock in the Presence of Swiss Needle Cast: Guidelines Based on Relative Basal Area Growth of Individual Trees
37 In coastal forests of the Pacific Northwest, young coniferous plantations typically contain a 38 mixture of planted and natural Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga 39 heterophylla). Swiss needle cast (SNC) disease inhibits the growth of Douglas-fir to varying 40 degrees in these stands, depending on SNC severity. In addition to the value differential between 41 Dou...
متن کاملComparing productivity of pure and mixed Douglas-fir and western hemlock plantations in the Pacific Northwest
We studied pure and 50/50 mixtures of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) plantations to compare attained total yields between mixed-species stands as opposed to monocultures of equal densities. Whether overall stand density influences this outcome has not been adequately investigated, and to address this we included three den...
متن کاملReconstructed Old-Growth Forest Stand Structure and Composition of Two Stands on the Olympic Peninsula, Washington State
Peter, David H.; Harrington, Constance A. 2010. Reconstructed old-growth forest stand structure and composition of two stands on the Olympic Peninsula, Washington state. Res. Pap. PNW-RP-583. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 22 p. We reconstructed the stand structure and composition for two western Washington old-growth forest sta...
متن کاملFire-mediated pathways of stand development in Douglas-fir/ western hemlock forests of the Pacific Northwest, USA.
Forests dominated by Douglas-fir and western hemlock in the Pacific Northwest of the United States have strongly influenced concepts and policy concerning old-growth forest conservation. Despite the attention to their old-growth characteristics, a tendency remains to view their disturbance ecology in relatively simple terms, emphasizing infrequent, stand-replacing (SR) fire and an associated li...
متن کاملGrowth, Development and Yield in Pure and Mixed Forest Stands
Objective: Ecosystems with mixed species compared to the ones with pure compositions provide a broader range of options in the fields of biodiversity, conservation, protection and restoration. Nearly all forest plantations are established as monocultures, but research has shown that there are potential advantages to be gained by using carefully designed species mixtures in place of monocultures...
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تاریخ انتشار 2004