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Recruitment and function of large woody debris in four California coastal streams.

机译:加利福尼亚四个沿海溪流中大型木屑的招募和功能。

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摘要

Recruitment and function of large woody debris (LWD) was assessed on four central coastal California streams by modifying the California Department of Fish & Game's inventory form to (1) identify trees and LWD to species; (2) separate upslope habitats into perched (edge of bankfull channel), riparian (differentiated stream-dependent vegetation) and upslope zones; (3) separate the channel into lowflow and bankfull zones; and (4) indicate effects of LWD on habitat features. The majority of in-channel LWD was small and not creating backwater or pool habitats. Most hardwood LWD was small-diameter alder and was most abundant in downstream reaches with wide floodplains. Longer, thicker LWD, especially with rootwad attached, was more likely to create pools and backwaters. Most of this LWD was old, weathered redwood which, although scarce, created most in-channel structures, especially in upstream reaches. Most potential LWD recruitment was from small-diameter, perched alders; large conifers are apparently recruited episodically.
机译:通过修改加利福尼亚州鱼类与猎物部的清单格式,对加利福尼亚州中部四个沿海河流的大型木屑(LWD)的招募和功能进行了评估,以(1)识别树木和LWD物种。 (2)将上坡生境分为栖息区(河岸通道的边缘),河岸区(取决于河流的不同植被)和上坡区; (3)将航道分为低流量区和堤岸区; (4)指出随形随形变化对栖息地特征的影响。航道内随钻测井的大部分很小,并且没有造成死水或池生境。大部分硬木随钻测井是小径al木,在下游河段较宽泛的平原上最为丰富。更长,更厚的随钻测井,特别是在连有根茎的情况下,更可能形成水池和死水。随钻测井的大部分是老的,风化的红木,尽管稀少,但形成了大部分通道内结构,尤其是在上游河段。 LWD潜在的招募者最多是小直径al树。大型针叶树显然是在流行上招募的。

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