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作 者 ：张合平 刘煊章

期 刊 ：林业科学 1997年 33卷 zk2期 页码：84-93

关键词：杉木林地；干扰；土壤水分；谐波；模拟；

Keywords:Chinese fir, Disturbance, Soil water content, Harmonic wave, Simula-tion,

摘 要 ：运用动态数据分析和谐波理论，模拟和分析杉木林地不同干扰方式下土壤水分周期性变化。结果表明，杉木林地土壤水分变化序列由一确定的周期分量与非确定的随机分量迭加而成；周期分量是气象因子周期性变化的反映(主周期)，或是林木需水规律和气象因子周期性变化的综合性反映(次周期)；随机分量反映了随机性的气象因子波动对土壤水分的影响。对皆伐区、对照区和间伐区土壤水分变化过程的模拟显示，该组合模型能以较高精度模拟在长时期内土壤水分的动态变化过程。间伐区周期性振动最剧烈。对照区次之，皆伐区最小；随着土层深度增加，各集水区土壤水分周期性振动明显减弱。

Abstract:Dynamic data analysis and harmonic wave theory are applied to simulate and ana-lyze perildic changes in soil moisture under different modes of artificial disturbnce in Chinese fir plantation．Results showed that soil moisture series on the forest land is sup-perposed by a stochastic component，which is a reflection of the effect of stochastic flue-tuations of climate on soil water content，and a perildic deterministic process，which is a reflection of periodic changes in climate or combinations of the water requirements of trees and periodic variations of climate．Simulation of the soil moisture series of clearcut-ting，control and thinning watersheds demonstrates that the additive model is of high precision for modelling long term change process of soil water．Periodic vibration de- creases in the order of：thinning>control>clearcutting，and the vibration of the three watersheds abates significantly with the increasing of soil depth．

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