- 期刊
- OpenAccess
Understory Light at the Fushan Experimental Forest in Northeastern Taiwan: Watershed and Landscape Perspectives
台灣東北部福山試驗林之林下光照環境：集水區階層與地景階層之異同
摘要
林下光照對小苗的生長及森林的更新有很大的影響，許多研究者在對地景階層的異質性並無深入了解的情形下，就將小範圍內林下光照的調查結果引伸至較大的空間範圍。本研究以半球面影像技術在台灣東北部的福山試驗林，探討小集水區階層及地景階層的林下光照情況。研究共建立二十條樣線，七條位於一號試驗集水區，十三條散布在150 ha的範圍內。由於少數微棲地因颱風造成的林冠損害而有相當高的光照，故福山試驗林之林下光照並非常態分布。福山試驗林在集水區及地景階層林下光照之中位數皆高於林外全光照的15%，較許多熱帶及溫帶森林林下光照不到林外5%的情形高出甚多。在福山試驗林，坡向較空間尺度對林下光照有更大的影響，因此在地形起伏劇烈如福山試驗林的地區，利用多條由稜線延伸至溪谷的樣線，比少數幾條綿延甚長的樣線或樣區更能充分涵蓋空間的異質性。
並列摘要
Understory light regimes have a major impact on seedling growth and patterns of forest regeneration. Many researchers have reported understory light regimes for relatively small areas, and then extrapolated their results to the landscape level with little knowledge of landscape-level heterogeneity. We used hemispherical photography to characterize understory light regimes at both the watershed and landscape scales within the Fushan Experimental Forest in northeastern Taiwan. We established 20 transects, 7 of which were located in Experimental Watershed #1 and the other 13 were scattered across an area of 150 ha at the Fushan Experimental Forest. Understory light was not normally distributed across the Fushan Experimental Forest, with some microsites having yew high light levels due to typhoon-induced canopy damage. Median understory light levels exceeded 15% of the incident sunlight at both the watershed and landscape scales. These light levels are much higher than those reported for many mature tropical and temperate forests in other parts of the world, where understory light levels of ＜5% of incident sunlight are common. Aspect, rather than spatial scale, had the largest impact on undercanopy light. In forests with rough topography, utilizing transects that run from the ridge to the valley is more likely to adequately characterize spatial heterogeneity than plots or a few longer transects.
延伸閱讀
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