胸径特征量在FVS系统中的影响研究

为了在我国建立全国性的森林植被生长模拟系统,选择美国的森林植被模拟系统(FVS)作为预测森林植被生长的参照原型。但是,森林植被生长受各种环境因子和其本身生理活动差异的影响,造成生长的极端复杂性,而FVS中也存在大量生长特征量,需对它们进行有选择的研究。本文从众多生长特征量中选择胸径作为基本特征量,以北京西山地区油松、侧柏的调查数据为数据源,对各种生长模型进行研究分析,对FVS中的模型进行利用和修正后,模拟了基本生长模型,经计算验证,该方法形成的生长预测体系是完整有效的。

Study on the Crucial Role of DBH Features in Forest Vegetation Forecast

In recent years,the study on forest vegetation growth has made some progress.It is also a basis of the computer model of FVS,which is U.S.forest vegetation simulation software.In this paper FVS is also reference prototype to Chinese forest vegetation system.In the research of finding of suitable growth model to our country's forest,the study shows that the biological activity under the cover of various ecological factors and vegetation growth becomes extremely complex.Which model should the study begin with How to choose the base factor or base model for forest vegetation How to work out a set of single-tree-growth prediction system applied to various types of vegetation in our country These questions become difficulties in the research.In the study there were lots of inventory data of Pinus tabulaeformi and Platycladus orientalis in Beijing area.A lot of various growth models of FVS have been researched,reused and remodified.The calculation results showed that calculation of DBH played a decisive role in the forecast of forest vegetation growth.And it can be asserted that DBH is a key factor and important datum,which can play a breakthrough role in the study of all forest vegetation simulation system.