| Popis: |
Estimates of wood yield and nitrogen accretion for pulpwood and sawlog rotations of red alder on good sites were coupled with information on managed yields of Douglas-fir to compare six management systems: unfertilized Douglas-fir, fertilized Douglas-fir, alder-pulpwood rotation followed by Douglas-fir, densely seeded alder killed by herbicides and followed by Douglas-fir, alder-sawlog rotation followed by one Douglasfir rotation, and alder-sawlog rotation followed by two Douglas-fir rotations. A net-worth analysis indicated that all systems are profitable and that systems involving red alder, though not as profitable as systems involving only Douglas-fir, show considerable promise. The criteria and assumptions involved in these results and pertinent ecological and management considerations are discussed. It is concluded that crop rotation merits pilot-scale testing in the Douglas-fir region. |
