کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6384403 1626617 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of watershed land-cover on the biogeochemical properties of estuarine tidal flat sediments: A test in a densely-populated subtropical island
ترجمه فارسی عنوان
اثر پوشش سرزندگی حوضه بر خصوصیات بیوگرافی شیمیایی رسوبات صخره ای استوار: آزمایش در یک جزیره نیمه گرمسیری پر جمعیت
کلمات کلیدی
پوشش زمین حوضه آبریز، صخره ایسادارین جزر و مد، ایزوتوپ پایدار کربن و نیتروژن، ماده آلی آلی، جزیره اوکیناوا،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
The effects of watershed land cover on the biogeochemical properties of estuarine tidal flat sediment were examined in estuarine tidal flats of 16 watersheds in a densely populated, subtropical island of Japan. Despite the small sizes of the watersheds (<16.5 km2), a redundancy analysis showed that river water quality explained 62% of the cross-estuary variation in the biogeochemical properties of estuarine tidal flat sediment by the first two ordination axes. We also found that the dissolved nutrient concentrations of river water and pheophytin a content of tidal flat sediment were positively related to agricultural and urbanized land cover in the watersheds. These results indicate that human nutrient inputs significantly increase algae-derived deposits in estuaries with relatively more developed watersheds. The δ13C of particulate organic matter (POM) was negatively related to watershed forest cover. This suggests that terrestrially derived-origin POM deposits are substantial in the estuaries connected to watersheds with relatively high forest cover. However, the chemical properties of tidal flat sediment were not related to chemical indicators of POM in the base flow. We hypothesize that substantial terrestrially derived POM is discharged to estuaries of high-forest-cover watersheds during high flow, and this partially controls the chemical properties of estuarine sediments. Our results demonstrate that the chemical properties of estuarine tidal flats are associated with watershed land cover, and that the dominant processes controlling estuarine sediment properties differ among watersheds depending on land cover composition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 184, 5 January 2017, Pages 207-213
نویسندگان
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