Afforestation of abandoned agricultural lands for carbon sequestration: how does it compare with natural succession?,Plant and Soil

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Afforestation of abandoned agricultural lands for carbon sequestration: how does it compare with natural succession?
Plant and Soil ( IF 3.9 ) Pub Date : 2022-04-21 , DOI: 10.1007/s11104-022-05396-3
Melina Thibault ₁ , Evelyne Thiffault ₁ , Yves Bergeron _{2,

3} , Rock Ouimet ₄ , Sylvie Tremblay ₄

Affiliation

Purpose

The objective of this study was to compare the accumulation over time of organic carbon (C) in soil and vegetation of abandoned agricultural lands left to natural vegetation succession or afforested with planted white spruce (Picea glauca (Moench) Voss) in Abitibi (Canada). The agricultural areas of this region originated from the clearing of forested lands in the late 19th -early 20th centuries. The aim was to determine whether afforestation of such lands is a relevant tool for C sequestration and climate change mitigation.

Methods

Field and laboratory measures for tree, shrub and herbaceous strata, woody debris and soil down to a 50 cm depth were carried out on abandoned agricultural lands that were either left to natural succession or planted, to determine total C stocks. The experimental design was a chronosequence covering 50 years, with sites representing various stages following agriculture abandonment and plantation.

Results

There was no significant difference in the amount of C stored by lands that were either planted or left to natural succession over a 50-year time period. Both types of lands were found to be net C sinks. Abandoned lands left to natural succession stored 1.3 times more C in the soil compared with afforested lands, while the latter stored twice as much C in aboveground biomass.

Conclusions

These results put into perspective the use of afforestation to increase land C sinks and suggest that natural succession might also play a role in land management practices in the context of climate change mitigation.

中文翻译：

为固碳而废弃农地造林：与自然演替相比如何？

目的

本研究的目的是比较在 Abitibi（加拿大）留给自然植被演替或种植白云杉 ( Picea glauca (Moench) Voss)的废弃农田土壤和植被中有机碳 (C) 随时间的积累情况. 该地区的农业区起源于 19 世纪末至 20 世纪初的林地开垦。目的是确定在这些土地上造林是否是碳封存和减缓气候变化的相关工具。