Soil carbon sequestration in phytoliths
Soil carbon sequestration in phytoliths
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DOI：
10.1016/j.soilbio.2004.06.013
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发表时间：
2005-01-01
影响因子：
9.7
通讯作者：
Sullivan, LA
中科院分区：
文献类型：
--
作者：
Parr, JF;Sullivan, LA
本文研究了植硅体中的有机碳在某些土壤固碳中的作用。结果表明，PhytOC是土壤总有机碳的重要组成部分。与土壤环境中的其他土壤有机碳成分相比，PhytOC具有很强的抗分解性，在有机物分解1000年后，在排水良好的土壤中，PhytOC占总碳量的82%。估计的PhytOC积累率在估计的全球平均长期（即千年尺度）土壤碳积累率2.4 g C m（-2）yr（-1）的15%和37%之间，表明土壤中PhytOC的积累是陆地固碳的重要过程。植硅体的生产率和植硅体中的长期固碳根据上覆植物群落而变化。一种甘蔗作物的PhytOC产量为18.1 g C m（-2）yr（-1），这一积累率是长期（千年）可持续的，但与通过改变土地利用方式（如将耕地转变为森林或草地，或将耕作方式从传统耕作改为免耕）可实现的碳固存率（但只能持续几十年）相当。这一过程提供了利用产生大量PhytOC的植物物种加强陆地固碳的机会。2004 Elsevier Ltd.保留所有权利。
The role of the organic carbon occluded within phytoliths (referred to in this text as 'PhytOC') in carbon sequestration in some soils is examined. The results show that PhytOC can be a substantial component of total organic carbon in soil. PhytOC is highly resistant to decomposition compared to other soil organic carbon components in the soil environments examined accounting for up to 82 % of the total carbon in well-drained soils after 1000 years of organic matter decomposition. Estimated PhytOC accumulation rates were between 15 and 37 % of the estimated global mean long-term (i.e. on a millenial scale) soil carbon accumulation rate of 2.4 g C m(-2) yr(-1) indicating that the accumulation of PhytOC within soil is an important process in the terrestrial sequestration of carbon. The rates of phytolith production and the long-term sequestration of carbon occluded in phytoliths varied according to the overlying plant community. The PhytOC yield of a sugarcane crop was 18.1 g C m(-2) yr(-1), an accumulation rate that is sustainable over the long-term (millenia) and yet comparable to the rates of carbon sequestration that are achievable (but only for a few decades) by land use changes such as conversion of cultivated land to forest or grassland, or a change of tillage practices from conventional to no tillage. This process offers the opportunity to use plant species that yield high amounts of PhytOC to enhance terrestrial carbon sequestration. 2004 Elsevier Ltd. All rights reserved.