MODELING THE INTERACTIONS BETWEEN MOISTURE AND NUTRIENTS IN THE CONTROL OF FOREST GROWTH

被引:25
作者
KIMMINS, JP [1 ]
COMEAU, PG [1 ]
KURZ, W [1 ]
机构
[1] MINIST FORESTS, RES BRANCH, VICTORIA V8W 3E7, BC, CANADA
关键词
D O I
10.1016/0378-1127(90)90149-6
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Three major approaches to stand-level forest growth-and-yield modelling are briefly described: an empirical predictive approach; a process-based explanatory approach; and a predictive approach which combines both the empirical and the process approaches (the 'hybrid simulation' approach). The degree to which models representing these three approaches include an explicit representation of moisture and nutrients is reviewed, and the relationship between modelling objective, time-scale, and the inclusion of representation of moisture and nutrients is explored. There is a brief consideration of the nutrient and moisture-related processes that might be represented in a process-based, rotation-length, explanatory model, and the major processes and parameters that are affected by changes in these factors. The paper concludes with a suggestion as to how the inherent complexity of a process-based approach to simulating moisture might be simplified for use in a predictive hybrid simulation model. The way in which moisture and nutrients are represented in a forest stand or ecosystem model should be determined by the objectives of the model. There is no single 'ideal' approach, but for both explanatory and predictive models used over longer time-scales (one or more rotations), both moisture and nutrients should be explicitly represented. Because of the different time-scales of variation in moisture and nutrient parameters, and because management has a greater potential to affect nutrient parameters than moisture parameters over rotation-length time-scales, moisture can be treated in a more highly aggregated manner than nutrients in long-time-scale models. In contrast, nutrients can probably be omitted from shorter-time-scale models without significantly impairing their performance unless they are to be used to simulate events that effect nutrient availability significantly (e.g., fertilization). The relative importance of representing moisture and nutrients will also depend on the type of site and on the adaptations of the species being simulated. Simulation of moisture should probably take procedence on dry sites and in climates which have significant growing-season moisture-deficits, whereas a detailed simulation of nutrients may be essential for accurate growth-and-yield prediction on fresh to moist sites and in humid climates. Any simulation of the effects of long-term climatic change on forest productivity should include the interactive effects of both moisture and nutrients. © 1990.
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页码:361 / 379
页数:19
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