کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
85923 159152 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Soil C:N:P dynamics during secondary succession following fire in the boreal forest of central Canada
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Soil C:N:P dynamics during secondary succession following fire in the boreal forest of central Canada
چکیده انگلیسی


• Post-fire soil nutrient dynamics are influenced by stand age and overstory trees.
• C and N increased rapidly, but fluctuated in mature and old-growth forest stands.
• P concentration showed a more gradual, linear increase as forest stands aged.
• C:N, C:P and N:P were highest at intermediate ages, particularly in conifer stands.
• Nutrient response to disturbance and forest succession decreased with soil depth.

Measures of soil nutrient availability such as concentrations of nitrogen and phosphorus ([N] and [P]) are important indicators of terrestrial productivity. Optimal plant growth and ecosystem functioning are also strongly correlated with nutrient ratios in soils. Long-term trends in soil [C], [N], [P], and their stoichiometric ratios during secondary succession in the fire-driven boreal forest remain unclear. We used replicated 7- to 209-year chronosequences to examine the influence of stand age and overstory composition on [C], [N], and [P] and their ratios in the forest floor, surface (0–15 cm), and subsurface (15–30 cm) mineral soil in the boreal forest of central Canada. In the forest floor, [C] and [N] increased rapidly during the first three decades following fire, after which they fluctuated, but remained larger than in the youngest stands. Surface soil [C] and [N] increased from young to intermediate-aged stands, but decreased in the oldest stands. Subsurface [C] and [N] followed a similar trend, but was higher in the 7-year-old stands. Forest floor [P] followed a gradual, linear increase throughout stand development but of smaller magnitude than [C] and [N]. The temporal pattern of [P] in both mineral soil layers was lower in the 33-year-old stands of all overstory types, suggesting that P resources may be outpaced by their demand during this highly competitive stage of advanced stem exclusion during forest succession. In the forest floor and surface soil, C:N differed not only with stand age but also with overstory type, due to higher C:N in intermediate-aged conifer stands. Forest floor C:P and N:P were higher in the 33- to 146-year-old stands in all overstory types and soil layers, but particularly so in the conifer stands. In the mineral layers, C:N, C:P, and N:P all followed a similar trend. Our results demonstrate the important influence of stand age, overstory composition (as influenced by succession), and soil depth on forest soil nutrient dynamics in boreal forest ecosystems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 369, 1 June 2016, Pages 1–9
نویسندگان
, , , , ,