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目前,国内外多用立地指数来表示森林生产力的高低。立地指数是以林分年龄和林木优势高(米)为依据的,它能较确切地反映森林生产力的高低。但立地指数只是一个数值,不能说明森林生产力高低的原因。本文先按立地指数来比较马尾松(pinus massoniana)林型的生产力,并通过逐步回归找出影响生产力的主要因素;其次,运用模糊数学综合评判法评价林型生产力与立地条件的关系;最后分析结果表明立地条件是导致林型生产力高低的主要原因。
At present, the home and abroad use the site index to express the level of forest productivity. The site index is based on the stand age and forest superiority (m), which can more accurately reflect the level of forest productivity. However, the site index is only a numerical value that can not explain the reason for the high or low level of forest productivity. In this paper, we first compare the productivity of pinus massoniana forest by site index and find out the main factors affecting productivity through stepwise regression. Secondly, we use fuzzy comprehensive evaluation to evaluate the relationship between forest productivity and site conditions. Finally, The results show that the site conditions lead to the main reason for the productivity of forest type.