Soil carbon sequestration and land-use change: processes and potential
Soil carbon sequestration and land-use change: processes and potential
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DOI：
10.1046/j.1365-2486.2000.00308.x
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发表时间：
2000-03-01
影响因子：
11.6
通讯作者：
Kwon, KC
中科院分区：
文献类型：
--
作者：
Post, WM;Kwon, KC
当农业用地不再用于耕作，允许恢复自然植被或重新种植多年生植被时，土壤有机碳会积累。这一积累过程基本上逆转了土地从多年生植被转化而来时造成土壤有机碳损失的一些影响。我们讨论的基本要素是什么是已知的土壤有机质动态，可能会导致在土地利用和土壤管理的变化，在增强土壤固碳。我们回顾文献报道，有利于碳积累的土地利用变化后，土壤有机碳的变化。本数据摘要提供了一个指南，以近似的SOC封存率，可能与管理，并表明一些因素的相对重要性，影响土壤中的有机碳封存率。碳在土壤中积累的时间长短和速度变化很大，这与恢复植被的生产力、土壤中的物理和生物条件以及土壤有机碳输入和物理扰动的历史有关。在多年生植被生长的早期加积阶段，C积累的最大速率虽然很大，但通常远低于100 g C m（-2）y（-1）。森林或草地的平均累积速率相似：分别为33.8 g Cm（-2）y（-1）和33.2 g Cm（-2）y（-1）。这些观察到的土壤有机碳积累率，结合少量的土地面积，是不足以占一个显着的一部分，在全球碳循环中的失踪C积累在以前的农业用地的土壤。
When agricultural land is no longer used for cultivation and allowed to revert to natural vegetation or replanted to perennial vegetation, soil organic carbon can accumulate. This accumulation process essentially reverses some of the effects responsible for soil organic carbon losses from when the land was converted from perennial vegetation. We discuss the essential elements of what is known about soil organic matter dynamics that may result in enhanced soil carbon sequestration with changes in land-use and soil management. We review literature that reports changes in soil organic carbon after changes in land-use that favour carbon accumulation. This data summary provides a guide to approximate rates of SOC sequestration that are possible with management, and indicates the relative importance of some factors that influence the rates of organic carbon sequestration in soil. There is a large variation in the length of time for and the rate at which carbon may accumulate in soil, related to the productivity of the recovering vegetation, physical and biological conditions in the soil, and the past history of soil organic carbon inputs and physical disturbance. Maximum rates of C accumulation during the early aggrading stage of perennial vegetation growth, while substantial, are usually much less than 100 g C m(-2) y(-1.) Average rates of accumulation are similar for forest or grassland establishment: 33.8 g C m(-2) y(-1) and 33.2 g C m(-2) y(-1), respectively. These observed rates of soil organic C accumulation, when combined with the small amount of land area involved, are insufficient to account for a significant fraction of the missing C in the global carbon cycle as accumulating in the soils of formerly agricultural land.