Forest summer albedo is sensitive to species and thinning: how should we account for this in Earth system models?
Forest summer albedo is sensitive to species and thinning: how should we account for this in Earth system models?
复制标题
森林夏季反照率对物种和间伐很敏感：我们应该如何在地球系统模型中解释这一点？
DOI：
10.5194/bg-11-2411-2014
复制
发表时间：
2014
期刊：
影响因子：
4.9
通讯作者：
S. Luyssaert
中科院分区：
文献类型：
--
作者：
J. Otto;D. Berveiller;F. Bréon;N. Delpierre;Gernot Geppert;A. Granier;W. Jans;A. Knohl;A. Kuusk;B. Longdoz;E. Moors;M. Mund;B. Pinty;M. Schelhaas;S. Luyssaert
虽然森林经营是减缓气候变化的措施之一，但森林经营与林冠植被恢复之间的关系一直被气候模式所忽视。在这里，我们开发了一种可以在地球系统模型中实现的方法。利用林窗模型、林冠辐射传输模型和卫星模型参数，定量研究了森林间伐对夏季林冠辐射的影响。这种方法揭示了哪个参数对夏季冠层厚度的影响最大：我们研究了三种森林物种（松树，山毛榉，橡树）和四种间伐策略的影响，在五个不同的地点（40 N 9 E-60 N 9 E），在一个恒定的森林地面厚度（轻到强烈的间伐制度）和五个不同的太阳天顶角。在林分建立过程中，夏季冠层蒸腾是由树种驱动的。在林分发育的后期，树种对夏季冠层覆盖率的影响逐渐减小，森林间伐的影响逐渐增大。这些趋势一直持续到轮伐期结束，在此期间，稀疏解释了近红外光谱中高达50%的方差和可见冠层光谱中高达70%的方差。所有物种的绝对夏季冠层覆盖度范围为0.03 - 0.06（可见）和0.20 - 0.28（近可见）。
Although forest management is one of the instru- ments proposed to mitigate climate change, the relationship between forest management and canopy albedo has been ig- nored so far by climate models. Here we develop an ap- proach that could be implemented in Earth system models. A stand-level forest gap model is combined with a canopy radiation transfer model and satellite-derived model parame- ters to quantify the effects of forest thinning on summertime canopy albedo. This approach reveals which parameter has the largest affect on summer canopy albedo: we examined the effects of three forest species (pine, beech, oak) and four thinning strategies with a constant forest floor albedo (light to intense thinning regimes) and five different solar zenith angles at five different sites (40 N 9 E-60 N 9 E). During stand establishment, summertime canopy albedo is driven by tree species. In the later stages of stand devel- opment, the effect of tree species on summertime canopy albedo decreases in favour of an increasing influence of for- est thinning. These trends continue until the end of the rota- tion, where thinning explains up to 50 % of the variance in near-infrared albedo and up to 70 % of the variance in visible canopy albedo. The absolute summertime canopy albedo of all species ranges from 0.03 to 0.06 (visible) and 0.20 to 0.28 (near-
影响因子：
6.3
作者：
Lenton, T. M.;Vaughan, N. E.
通讯作者：
Vaughan, N. E.
影响因子：
4.9
作者：
Bathiany, S.;Claussen, M.;Gayler, V.
通讯作者：
Gayler, V.