论文标题
干旱地区森林的潜在全球隔离二氧化碳
Potential Global Sequestration of Atmospheric Carbon Dioxide by Drylands Forestation
论文作者
论文摘要
旱地森林提供了大气中的长期隔离$ _2 $的潜力。考虑基于大气中的碳，考虑一个种植的半干旱森林对有机和无机碳的隔离。以色列的Yatir森林的测量值$ \ sim $ \ sim $ 550克$ _2 $ _2 $ m $^{ - 2} $ yr $^{ - 1} $作为树生生物质量中的有机碳。此外，$ \ sim $ 216克$ _2 $ m $^{ - 2} $ yr $^{ - 1} $由于有机土壤碳上的微生物活性的结合以及土壤水与Co $ _2 $ _2 $ eugh的反应而在土壤中沉淀为有方解石（caco $ _3 $），因此在土壤中陷入土壤中。当葡萄糖（由光合作用产生）被氧化以为树木的细胞过程提供能量时，会形成呼出的Co $ _2 $。值得注意的是，旱地的低降雨阻止了溶解沉淀的方解石。发布的估计限制了可持续森林的潜在旱地表面$ \ sim $ \ $ 450万km $^2 $，仅$ \ sim $ 10 $ \％\％\％的全球旱地$。主要的限制是显然缺乏水。但是，在许多旱地下，有一些化石水在先前潮湿的气候状态下充电了含水层的基础含水层。保守地，包括这种水，至少有900万km $^2 $可用于造林。这样的区域可能会产生潜在的年度隔离率$ \ sim $ 7.0 gt co $ _2 $ yr $^{ - 1} $，在$ \ sim $ 5.0 $ 5.0 gt co $ _2 $ _2 $ _2 $ yr $^{ - 1} $（有机）和$ \ sim $ \ sim $ 2.0 gt co $ _2 $ _2 $ _2 $ _2 $ yr $ $ $^$}可敬的$ \ sim $ 35 $ \％$ \％的大气co $ _2 $增加。但是，考虑到陆地表面反照率的减少（反射率），有效冷却为$ \ sim $ 5.0 gt co $ _2 $ yr $^{ - 1} $。旱地造林将为隔离提供额外的区域。
Drylands forestation offers the potential for significant long-term sequestration of atmospheric CO$_2$. Consider sequestration of both organic and inorganic carbon by a planted semi-arid forest, based on carbon that originates from atmospheric CO$_2$. Measurements at Israel's Yatir forest give a sequestration rate of $\sim$550 gram CO$_2$ m$^{-2}$ yr$^{-1}$ as organic carbon in the tree's biomass. In addition, $\sim$216 gram CO$_2$ m$^{-2}$ yr$^{-1}$ precipitates as calcite (CaCO$_3$) in the soil due to a combination of microbial activity on organic soil carbon, and the reaction of soil water with CO$_2$ exhaled from tree roots. The exhaled CO$_2$ is formed when glucose (produced by photosynthesis) is oxidized to supply energy for the trees' cellular processes. Significantly, low rainfall in drylands precludes dissolving precipitated calcite. Published estimates restrict the potential drylands surface available for sustainable forestation to $\sim$4.5 million km$^2$, only $\sim$10$\%$ of the global drylands. The dominant limitation is the apparent lack of water. However, immediately under many drylands, there are fossil waters that had recharged underlying aquifers during prior wetter climatic regimes. Conservatively, including this water, at least 9.0 million km$^2$ is available for afforestation. Such an area may yield a potential total annual sequestration rate of $\sim$7.0 Gt CO$_2$ yr$^{-1}$, divided between $\sim$5.0 Gt CO$_2$ yr$^{-1}$ (organic) and $\sim$2.0 Gt CO$_2$ yr$^{-1}$ (inorganic); a respectable $\sim$35$\%$ of the annual rate of atmospheric CO$_2$ increase. However, considering the reduction in land surface albedo (reflectivity), the effective cooling would be $\sim$5.0 Gt CO$_2$ yr$^{-1}$. Drylands reforestation would provide additional area for sequestration.
