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前言树木形成层的电阻(ER)是与树木的树冠状况、林冠级、落叶引起的损伤(War-go 和 Skutt 1975),离子浓度(Smifh 等1976)、直径生长率,创伤愈合(Zhurav-leva 1972;Wargo 1977;Shortle 等1977,1979,1981)和水势变化(Dixon 等1978)等相关联的。此外,曾报导 ER 与韧皮部厚度,树木直径和季节性变化之间也有关(Wargo等1975;Newbanks 等1977;Carter 等1978;Cole 等1979;Zhuravleva 1972;Dolozhentsev 等1970;Davis 等1979)。实验表明,无论在树木生理学上、营林学上和病理学上都表现存在明显的电阻差异。例
INTRODUCTION The tree formation resistance (ER) is related to tree crown status, canopy damage, deciduous damage (War-go and Skutt 1975), ion concentration (Smifh et al. 1976), diameter growth rate, wound healing (Zhurav-leva 1972; Wargo 1977; Shortle et al. 1977, 1979, 1981) and changes in water potential (Dixon et al. 1978). In addition, ER and phloem thickness, tree diameter and seasonal changes have also been reported (Wargo et al. 1975; Newbanks et al. 1977; Carter et al 1978; Cole et al 1979; Zhuravleva 1972; Dolozhentsev et al 1970; Davis et al 1979). Experiments show that, in terms of tree physiology, silviculture and pathology, there are obvious differences in resistance. example