کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4520561 1625161 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A one-year post-fire record of macronutrient cycling in a mountain sandstone fynbos ecosystem, South Africa
ترجمه فارسی عنوان
یک سال پس از آتش سوزی دوچرخه سواری مغناطیسی در یک ماسه سنگ کوه فینبوس اکوسیستم، آفریقای جنوبی
کلمات کلیدی
فینبوس، اکوسیستم نوع مدیترانه ای، سازند شبه جزیره، ماسه سنگ، آتش، اسپری های دریایی، گرد و غبار معدنی، مغذی ها
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
چکیده انگلیسی


• Marine aerosols were the main source of Cl, Na and SO4 during summer.
• Mineral aerosols and fire ash delivered Ca, Mg and K primarily during winter months.
• The delivery of macronutrients reflects seasonal differences.
• The pulse of nutrients rapidly diminished after the June 2010 fire.
• Most stream nutrients returned to pre-fire levels within 9 months.

Nutrient inputs and dynamics of the fynbos ecosystem, particularly after a fire, are poorly understood. This article provides chemical analyses of macronutrients (Cl, Na, SO4, Mg, Ca and K) in rainwater, stream water, soil and bedrock over a period of one year following a fire event in a coastal mountain sandstone fynbos ecosystem.Rainwater, stream water, soil and bedrock samples were taken from a mountain fynbos area underlain by homogeneous Peninsula Formation sandstone bedrock for a one-year period. Rainwater, stream water and soil saturated paste extracts were analysed for macronutrients using a Dionex DX-120 Ion Chromatograph. Crushed soil and bedrock samples were analysed for major element oxide and S content.Above-ground biomass recovery after one year was modest (5–10% of the 19-year-old pre-fire biomass) with marine aerosols supplying Cl and Na ions to the ecosystem and a significant amount of Mg, SO4, Ca and K. Additional Mg, SO4, Ca and K are supplied by deposition of local and regional fire ash and dust (mineral aerosols) transported from inland sources mostly by northwesterly winter winds. Nutrient loss diminishes rapidly with the return of pre-fire stream values within 9 months after fire, with nutrients gradually replaced through atmospheric deposition rather than the slow weathering bedrock.Macronutrients supplied to the study area reflect seasonal differences with atmospheric processes being the primary source of nutrients to the ecosystem.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: South African Journal of Botany - Volume 97, March 2015, Pages 48–58
نویسندگان
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