کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
86226 159172 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Decay patterns and carbon density of standing dead trees in California mixed conifer forests
ترجمه فارسی عنوان
الگوهای کاهش و تراکم کربن درختان ایستاده در کوه های کوهی در کالیفرنیا
کلمات کلیدی
افتادن کربن، حسابداری گازهای گلخانه ای، مخروط مخلوط، گیر، مرده ایستاده، تراکم چوب
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We quantify properties of standing dead trees in California mixed conifer forests.
• Density declines and carbon concentration increases with advancing snag decay class.
• Overall carbon density declines with advancing decay class.
• The vertical position of wood within a standing dead tree impacts its density.
• Considering snag carbon loss lowers estimates of the forest carbon captured in the region.

Dead wood plays important structural and biogeochemical roles in forest ecosystem processes. Some aspects of woody debris dynamics have been carefully studied, but the decay patterns and carbon density of standing dead (SD) trees are only weakly characterized. Climbing forest mortality rates are also driving increases in the creation and abundance of SD trees. All forms of forest carbon accounting, from stand-level biomass calculations to dynamic earth systems models, are improved by a better understanding of SD tree physical and chemical traits. Using dimensional analysis, we described the patterns of density, carbon concentration, and net carbon density in decaying SD trees of six California mixed conifer species. As decay class advanced, trees showed a progressively lower density and a small increase in carbon concentration. Net carbon density of the most decayed SD trees was only 60% that of live trees. The key characteristics of SD trees that determine these patterns are species, surface to volume ratio, and relative position within the tree. The decay of SD trees and how deadwood biomass is estimated in large scale inventories also have repercussions in greenhouse gas accounting. When the measured changes in carbon density are applied to SD carbon stock estimates for California mixed conifer forests, the decay-adjusted estimates are 3.66–3.74 Tg (18%) lower than estimates that do not incorporate change due to decay.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 353, 1 October 2015, Pages 136–147
نویسندگان
, , , ,