Dynamics of aggregate-associated organic carbon following conversion of forest to cropland
Dynamics of aggregate-associated organic carbon following conversion of forest to cropland
复制标题
森林转耕地后聚集体相关有机碳的动态
DOI：
10.1016/j.soilbio.2012.10.020
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发表时间：
2013-02
影响因子：
9.7
通讯作者：
Wei XR, Shao MA, Gale WJ, et al.
中科院分区：
文献类型：
--
作者：
Wei XR, Shao MA, Gale WJ, et al.
天然林转变为农田通常会导致土壤有机碳（OC）的损失和进入大气的二氧化碳通量的增加。转化为农田后与骨料相关的有机碳的动态仍不清楚。这种理解对于准确估计土壤和大气之间的碳通量至关重要。为了更多地了解天然林地开垦后的有机碳动态，我们测量了中国陕西省成对的森林和农田地块中的总土壤和聚集体相关的有机碳。这片农田是 4 年前、50 年前和 100 年前由邻近的森林转变而来的。正如预期的那样，农田转变导致土壤总有机碳浓度和储量显着下降。最大的下降发生在种植初期。一个世纪的耕作使 0-20 cm 深度的土壤总有机碳储量减少了 0.77 kg m−2。随着森林转变为农田，与大团聚相关的有机碳储量减少，但与微团聚相关的有机碳储量增加。淤泥+粘土相关的有机碳库存没有受到影响。与大团聚体相关的有机碳储量的减少是由于大团聚体部分中土壤量的下降以及与大团聚体相关的有机碳浓度的降低造成的。这项研究的结果表明，森林转变为农田不仅减少了土壤总有机碳储量，而且还导致土壤总有机碳在不同规模类别和土壤深度之间的分布百分比发生变化。这些变化将延迟有机碳的损失，因此森林土壤中因耕作而造成的有机碳损失可能低于预期。
The conversion of natural forest to cropland generally results in the loss of soil organic carbon (OC) and an increase in CO2flux to the atmosphere. The dynamics of aggregate-associated OC after conversion to cropland are still not well understood. Such an understanding is essential for accurately estimating C flux between soil and the atmosphere. To learn more about OC dynamics after cultivation of natural forest land, we measured total soil and aggregate-associated OC in paired forest and cropland plots in Shaanxi Province, China. The cropland had been converted from adjacent forest 4, 50, and 100 yrs previously. As expected, the conversion to cropland resulted in significant declines in total soil OC concentrations and stocks. The largest decreases occurred during the early stages of cultivation. A century of cultivation decreased total soil OC stocks in the 0–20 cm depth by 0.77 kg m−2. Macroaggregate-associated OC stocks decreased, but microaggregate-associated OC stocks increased following the conversion of forest to cropland. Silt + clay-associated OC stocks were not affected. The reduction in macroaggregate-associated OC stocks was caused by declines in both the amount of soil in the macroaggregate fraction and by decreases in the concentration of macroaggregate-associated OC. The results of this study indicate the conversion of forest to cropland not only reduced total soil OC stocks, but also caused a percentage shift in the distribution of total soil OC among aggregate size classes and among soil depths. These shifts would delay the loss of OC, so the loss of OC in forest soil due to cultivation might thus be lower than expected.
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影响因子：
--
作者：
R. Simonson
通讯作者：
R. Simonson
影响因子：
2.9
作者：
P. Aina
通讯作者：
P. Aina
影响因子：
3.7
作者：
R. Houghton;D. Skole;D. Lefkowitz
通讯作者：
R. Houghton;D. Skole;D. Lefkowitz
影响因子：
6.5
作者：
Dominy, CS;Haynes, RJ;van Antwerpen, R
通讯作者：
van Antwerpen, R
DOI：
10.2136/sssaj1983.03615995004700030023x
发表时间：
1983-05
期刊：
--
影响因子：
--
作者：
H. Tiessen;J. Stewart
通讯作者：
H. Tiessen;J. Stewart