کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
88347 159299 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impacts of forest drainage improvement on stream biota: A multisite BACI-experiment
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Impacts of forest drainage improvement on stream biota: A multisite BACI-experiment
چکیده انگلیسی

Impacts of forestry have been described in many studies, with a strong focus on changes in run-off water quality. Biological responses to forest drainage and the efficiency of commonly used water protection methods remain largely unknown, however. We used a six-year replicated before-after-control-impact (BACI) field experiment to assess the effects of forest drainage improvement works (ditch cleaning; digging of supplementary ditches) on water chemistry, sedimentation, brown trout egg mortality and macroinvertebrate community composition in six headwater streams in Northern Finland. Standard water protection methods (ditch break combined with sedimentation pit) were used to reduce fine sediment (<1.0 mm) loading into the streams. Six artificial spawning sites were constructed in each stream, three downstream (treatments) and three upstream (controls) of the drainage areas. Sediment loading did not increase after forest drainage, and no changes were detected in water quality. Brown trout egg mortality rate increased after drainage works, but more so in the upstream controls than downstream treatment sections, and only in smaller (watershed <6.25 km2) streams. All macroinvertebrate metrics (e.g. total macroinvertebrate diversity and density) decreased significantly through time. However, these responses were observed in both control and treatment sections, and could not have been caused by the drainage works directly but were rather related to inter-annual variability in precipitation and discharges. Our results thus highlight the importance of placing results from local monitoring studies in a regional context.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 260, Issue 8, 15 September 2010, Pages 1315–1323
نویسندگان
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