کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
86173 159169 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Long-term changes in belowground and aboveground resource allocation of boreal forest stands
ترجمه فارسی عنوان
تغییرات درازمدت در تخصیص منابع زیرزمینی و زیر زمینی درختان جنگلی بیرال
کلمات کلیدی
تخصیص منابع نسبی، توسعه پایدار، بهره وری جنگل، جنگل نابالغ، تنفس خاک، در دسترس بودن مواد مغذی خاک
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We characterised the temporal changes in resource allocation.
• We derived a proxy to represent the aboveground-to-belowground carbon allocation.
• Belowground resource allocation increased during the first 200 years after fire.
• Soil nutrient availability is partly responsible for the declining stand productivity.
• The limited productivity of old-growth stands was not explained by high belowground allocation.

Age-related decline of forest stand growth is a common phenomenon, but the associated physiological causes remain uncertain. This study investigated a possible mechanism that could explain stand growth decline observed after canopy closure. We hypothesised that the proportion of resource allocation to roots increases with stand age as a response to a decrease in nutrient availability, which is related to the long-term accumulation of organic matter in boreal forests. Proxies based on soil respiration measurements and stem biomass production were used to describe temporal changes in the proportion of carbon allocated to belowground and aboveground stand components along a 1067-year post-fire chronosequence. The proportion of resources that were allocated belowground increased in the first 200 years following fire and declined thereafter. The inverse pattern was observed for the organic matter decomposition rate. Stand-level decline in wood productivity that was observed during the first 60-year period after fire can be attributed to a greater proportion of carbohydrates being allocated to roots in response to a decrease in nutrient availability. However, the relatively low productivity of old-growth stands was not associated with high belowground allocation, suggesting that other mechanisms operating at the tree- or stand-level may be involved.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 350, 15 August 2015, Pages 62–69
نویسندگان
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