Returning forests analyzed with the forest identity
Returning forests analyzed with the forest identity
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DOI：
10.1073/pnas.0608343103
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发表时间：
2006-11-14
影响因子：
11.1
通讯作者：
Waggoner, Paul E.
中科院分区：
文献类型：
--
作者：
Kauppi, Pekka E.;Ausubel, Jesse H.;Waggoner, Paul E.
尽管有大量关于毁林的报告，但一些国家还是经历了从毁林到重新造林的过渡。在因果关系中，森林特性将森林中固碳与国家或区域森林面积、单位面积生长种群密度、单位生长种群体积的生物量和生物量中的碳浓度等变量的变化联系起来。它量化了一个国家森林变化的来源。该特性还从逻辑上将木材采伐转移到密度增长较快的地区和种植园对森林面积的数量影响联系起来。在粮食及农业组织2005年全球森林资源综合评估报告的50个拥有广泛森林的国家中，没有一个年人均国内生产总值超过4 600美元的国家的森林蓄积量增长率为负数。利用森林特性和来自评估报告的国家数据，一个单一的天气图将50个国家排列在一起，并显示基本变量变化率的坐标，显示国家和异常值的集群，并表明森林及其属性的回归趋势。森林特性还可以作为一种工具，用于制定森林目标，并说明国家政策如何加速或延缓正在各国之间扩散的森林转型。
Amid widespread reports of deforestation, some nations have nevertheless experienced transitions from deforestation to reforestation. In a causal relationship, the Forest Identity relates the carbon sequestered in forests to the changing variables of national or regional forest area, growing stock density per area, biomass per growing stock volume, and carbon concentration in the biomass. It quantifies the sources of change of a nation's forests. The Identity also logically relates the quantitative impact on forest expanse of shifting timber harvest to regions and plantations where density grows faster. Among 50 nations with extensive forests reported in the Food and Agriculture Organization's comprehensive Global Forest Resources Assessment 2005, no nation where annual per capita gross domestic product exceeded $4,600 had a negative rate of growing stock change. Using the Forest Identity and national data from the Assessment report, a single synoptic chart arrays the 50 nations with coordinates of the rates of change of basic variables, reveals both clusters of nations and outliers, and suggests trends in returning forests and their attributes. The Forest Identity also could serve as a tool for setting forest goals and illuminating how national policies accelerate or retard the forest transitions that are diffusing among nations.