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一棵树在它的整个存在,它对大气中的二氧化碳净负面影响?

转换公司树而活着₂+水+ O - >碳水化合物₂。然而,一旦这棵树死了,它衰变,释放有限公司₂回到大气中。我的问题是,在一个单独的树的整体存在,一个树实际上有助于减少大气CO₂吗?

我知道还有其他途径树最终可能更长期的碳存储(碳质岩石),但最感兴趣如果一棵树死了,一片森林,腐烂在50 - 150年,它会导致净减少有限公司₂,还是树通常扮演更多的临时存储100 +年有限公司₂吗?

回答

简要回顾最近non-paywalled可用文献表明,这种效应可能存在,但很难量化基于当前可用的数据。一定数量的碳从树木可以隐藏在土壤时间时间显著长于典型地上分解的有机物质,可能了几千年。这明显延长碳循环的时间,但它是我不清楚这是否代表碳存储* *,因为似乎没有确立最低截止时间。soil-sequestered碳的主要来源是树根,落叶构成第二手来源。下面的纸(预印本在线(https://hal.archives-ouvertes.fr/hal-01234833/file/13593_2014_Article_212.pdf))地址问题农林复合经营的特定上下文,即农田点缀着树木。本文多次指出,土壤固碳的过程不清楚,定量测量和估计相差很大,正如预期的那样基于不同的气候和土壤条件。注意单位:Mg对应于每吨。克劳斯Lorenz和藤拉拉”,土壤有机碳封存在农林复合经营系统。审查。”*Agronomy for Sustainable Development*, Vol. 34, No. 2, April 2014, pp. 443-454. > The soil organic carbon (SOC) pool, in particular, is the only terrestrial pool storing some carbon (C) for millennia which can be deliberately enhanced by agroforestry practices. [...] The SOC storage in agroforestry systems is also uncertain and may amount up to 300 Mg C ha<sup>−1</sup> to 1 m depth. [...] Further, between 30 and 300 Mg C ha<sup>−1</sup> may be stored in agroforestry soils up to 1-m depth [...] The SOC sequestration depends primarily on the soil C input and soil stabilization processes. Plant root and rhizosphere inputs, in particular, make a large contribution to SOC [...] Litter fall and in turn SOC sequestration may be affected by stand-density management as, for example, higher stocking levels of trees enhance the vegetation C pool. Another [paper](https://www.fs.usda.gov/treesearch/pubs/download/15521.pdf) that deals specifically with *urban* trees mentions in passing that the soil accounts for a significant part of the carbon sequestered in *non-urban* forests (presumably both naturally growing and human-managed): David J. Nowak and Daniel E. Crane, "Carbon storage and sequestration by urban trees in the USA". *Environmental Pollution* 116 (2002) 381–389 > Another area of the urban forest carbon cycle that this paper does not analyze is urban soils. Sixty-one percent of the total carbon in non-urban forest ecosystems in the USA is stored in the soil environment (Birdsey and Heath, 1995). The amount of carbon from trees that is retained in urban soils, its residence time, and the amount of carbon currently stored in these soils remains to be investigated. It is likely, however, that urban soils contain less carbon per hectare than forest soils due to lower carbon inputs and increased soil decomposition rates due to warmer air and soil temperatures (e.g. Pouyat et al., 1997).

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\ begingroup美元这篇论文找到一个堆积速率的6.0到18.0 g C m $ ^{−2} $年$ ^{−1}$在北方泥炭森林。(从泥炭比树,我阅读它。) \ endgroup美元
- - - - - -基思·麦克
2021年2月11日在3:10

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