Light Fraction Carbon and Water-Stable Aggregates in Black Soils

SHI Yi; CHEN Xin; SHEN Shan-Min

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Light Fraction Carbon and Water-Stable Aggregates in Black Soils

机译：黑土中轻质碳和水稳定聚集体

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The distribution of light fraction carbon (LF-C) in the various size classes of aggregates and its relationship to waterstable aggregates as well as the influence of cultivation on the organic components in virgin and cultivated black soils were studied by wet sieving and density separation methods. The total organic carbon (TOC) and LF-C were significantly higher (P ≤ 0.05) in the virgin soils than in the cultivated soils. The LF-C in aggregates of different size classes varied from 0.9 to 2.5 g kg-1 in the cultivated soils and from 2.5 to 7.1 g kg-1 in the virgin soils, whereas the ratio of LF-C to TOC varied from 1.9% to 7.3% and from 5.0% to 12.2%, respectively. After being incubated under constant temperature and controlled humidity for three months, the contribution of LF-C to TOC sharply decreased to an amount (1.7%-8.5%)close to the level in soils that had been cultivated for 20 to 25 years (1.3%-8.8%). As a result, the larger water-stable macro-aggregates (especially ＞ 1 mm) decreased sharply, indicating that the LF-C pool in virgin soils declined quickly after cultivation, which reduced the water stability of soil aggregates.

机译：通过湿法筛分和密度分离法研究了轻质碳（LF-C）在各种大小的团聚体中的分布及其与水稳性团聚体的关系，以及耕作对原始土壤和栽培黑土中有机成分的影响。。原始土壤中的总有机碳（TOC）和LF-C显着高于耕作土壤（P≤0.05）。耕作土壤中不同尺寸类别的骨料中LF-C的变化范围为0.9至2.5 g kg-1，原始土壤中的LF-C的变化范围为2.5至7.1 g kg-1，而LF-C与TOC的比例变化为1.9％分别降至7.3％和5.0％至12.2％。在恒温恒湿条件下孵育三个月后，LF-C对TOC的贡献急剧下降至接近于已种植20至25年的土壤（1.3的水平）的量（1.7％-8.5％）。％-8.8％）。结果，较大的水稳性大团聚体（尤其是＞ 1 mm）急剧减少，表明原始土壤中的LF-C库在耕种后迅速下降，这降低了团聚体的水稳定性。

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来源
《土壤圈（英文版）》 |2007年第1期|97-100|共4页
作者
SHI Yi; CHEN Xin; SHEN Shan-Min;
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作者单位

Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 China;

Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 China;

Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
black soil; light fraction carbon; water-stable aggregates;

机译：黑土;轻质碳;水稳定的骨料;

Light Fraction Carbon and Water-Stable Aggregates in Black Soils

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