Stream lighting in five regions of North Island, New Zealand: control by channel size and riparian vegetation
Stream lighting in five regions of North Island, New Zealand: control by channel size and riparian vegetation
复制标题
新西兰北岛五个地区的溪流照明：受河道大小和河岸植被控制
DOI：
10.1080/00288330.1998.9516847
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发表时间：
1998
影响因子：
1.6
通讯作者：
J. Quinn
中科院分区：
文献类型：
--
作者：
R. Davies‐Colley;J. Quinn
摘要溪流的光照深刻地影响着它们的生态，特别是通过初级生产和热行为。我们使用成对的冠层分析仪，仪器与鱼眼透镜成像，测量阳光照射的溪流在五个地区的北岛，新西兰。到达平均流照明，在水和银行的水平，受到河岸植被类型的强烈影响。河流的光照强度相对较高（平均水位光照=环境的45%），大部分的阴影由银行和悬垂的草药。光照是低的小森林溪流（中位数= 1.3%的天然林，1.2%的松树种植），但急剧增加的差距在冠层扩大通道宽度以上的C。3.5 M.松树种植园的林下层比松树本身提供更多的树荫：对林下层的损害（例如，或因洪水而被山羊啃食）显著地增加了照明。松树种植园的收获暴露在高光照水平的溪流中，
Abstract Lighting of streams profoundly influences their ecology, particularly through primary production and thermal behaviour. We used paired canopy analysers, instruments with fish‐eye lens imaging, to measure sunlight exposure of streams in five regions of North Island, New Zealand. Reach‐averaged stream lighting, at both water and bank level, was strongly influenced by riparian vegetation type. Pasture streams had comparatively high light exposure (median water level lighting = 45% of ambient), with most shading contributed by banks and overhanging herbs. Lighting was low in small forest streams (median = 1.3% for native forest, 1.2% for pine plantations), but increased sharply as the gap in the canopy widened with increase in channel width above c. 3.5 m. The understorey in pine plantations contributed more shade than the pines themselves: damage to this understorey (e.g., by goat browsing or floods) increased lighting markedly. Harvesting of pine plantations exposed streams to high light levels exc...