作　　者： ; ; ; ; ;

机构地区： 华南农业大学林学院

出　　处： 《福建林业科技》 2013年第1期63-69,193,共8页

摘　　要： 采用自然全光照的16.72%(s17)、24.51%(s25)、36.49%(s36)和100%(s100)及林地下14.02%(s14)等5种光照强度,比较分析不同光照条件下的环境因子日变化、1年生幼苗成活率、生长量等指标,以期揭示幼苗对于夏季不同光照条件的光响应特征。结果表明:不同光照强度下,环境因子日变化显著不同,幼苗的成活率、形态和生理指标等均存在显著差异。极度弱光下(s17)幼苗生长迟缓;而全光照环境(s100)和较强光照下(s36)易造成幼苗的死亡;仅适度遮荫(s25)适于幼苗的生长;林下栽培(s14)的相对光照强度虽然较弱,但其各种小气候因子均明显优于无林地的其它光照条件,幼苗成活率、水分利用和平均净光合速率等指标均达到最优。建议抚育幼苗时应采用适宜的遮荫处理,可选择在中等郁闭度的林下(自然遮荫)或在大田中采用夏季单层遮荫。 In order to test the light response to different intensities,5 different treatments were set in this paper,including 16.72%(s17),24.51%(s25),36.49%(s36) and 100%(s100)of natural sunlight in open field and natural shade 14.02% under the forest(s14),the diurnal variation of environmental factors,and biomass were compared and analyzed.Result showed that different light intensities caused specific microclimate because of different diurnal variation of environmental factors,and made significant difference in the survival rate,morphological and physiological index.Severely weak shade conditions(s17)would inhibit the growth while the natural sunlight(s100)and strong light(s36) would cause the death of seedlings seriously.Only moderate shade treatment(s25) was suitable to the growth of seedlings.Although the light intensity of natural shade under the forest(s14) was quite weak,its microclimate factors were much better than other treatments in the open field,so the survival rate,water use and average net photosynthetic rate were all best in the treatments.The proper shading treatments were advised in the management of seedlings,such as using shading net by one layer in the field or natural shade under the forest with middle canopy density.

关 键 词： 伯乐树 年生幼苗 光照强度 光响应特征

领　　域： [农业科学] [农业科学]