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假设森林冠层组成会影响土壤呼吸,树木混交作为一种常见的林业管理措施,会引起碳循环的显著改变。在德国中部Solling云杉-山毛榉混交林开展一项研究,调查树冠层组成对土壤呼吸的作用。树冠盖度被分为4个等级:山毛榉(Fagussylvatica)覆盖层、云杉(Piceaabies)覆盖层、混交覆盖层和林分间隙,每种覆盖度选一块亚样地。2005年6月-2006年6月,每个月测定一次各样地的土壤呼吸。结果表明,山毛榉覆盖层(359g·m-2·a-1C)与林分间隙(211g·m-2·a-1C)的土壤呼吸存在显著差异。应用Raich和Nadelhoffer提出的模型对总的地下碳分配作估计,结果表明山毛榉业样地根系C02呼吸值(231g.m-2.a-1C)要比林分间隙养地的值(51g·m-2·a-1C)高许多。山毛榉冠层下的根呼吸/总土壤呼吸的比值(59%)高于林分间隙的比值(29%)。结果说明,山毛榉覆盖层下的微环境更适合土壤自养呼吸,CO2向大气排放量较高。
Assuming that forest canopy composition affects soil respiration, tree mix as a common forestry management measure can cause significant changes in the carbon cycle. A study was conducted in the Solling spruce-beech mixed forest in central Germany to investigate the effects of canopy composition on soil respiration. Canopy cover is divided into four grades: Fagussylvatica cover, Picea abies cover, mixed cover and stand gap, each covering a selected sub-plot. From June 2005 to June 2006, soil respiration for various plots was measured monthly. The results showed that there were significant differences in soil respiration between beech cover (359 g · m-2 · a-1C) and stand gap (211 g · m-2 · a-1C) Estimation of the total underground carbon distribution using the model proposed by Raich and Nadelhoffer indicated that the C02 respiration of the beech industry was 231 g · m-2.a-1C, which was 51 g · m -2 · a-1C) is much higher. The ratio of root respiration / total soil respiration under beech canopy (59%) was higher than the stand gap (29%). The results show that the microenvironment under the beech cover is more suitable for soil self-supporting breathing, and the CO2 emission to the atmosphere is higher.