Seasonal Variability of Soil Organic Carbon Fractions Under Arable Land

Henning SCHIEDUNG; Ludger BORNEMANN; Gerhard WELP

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Seasonal Variability of Soil Organic Carbon Fractions Under Arable Land

机译：耕地下土壤有机碳组分的季节变化

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Carbon fractions in soils apparently vary not only in space,but also over time.A lack of knowledge on the seasonal variability of labile carbon fractions under arable land hampers the reliability and comparability of soil organic carbon (SOC) surveys from different studies.Therefore,we studied the seasonal variability of two SOC fractions,particulate organic matter (POM) and dissolved organic carbon (DOC),under maize cropping:POM was determined as the SOC content in particle-size fractions,and DOC was measured as the water-extractable SOC (WESOC) of air-dried soil.Ammonium,nitrate,and water-extractable nitrogen were measured as potential regulating factors of WESOC formation because carbon and nitrogen cycles in soils are strongly connected.There was a significant annual variation of WESOC (coefficient of variation (CV)--30％).Temporal variations of SOC in particle-size fractions were smaller than those of WESOC.The stocks of SOC in particle-size fractions decreased with decreasing particle sizes,exhibiting a CV of 20％ for the coarse sand-size fraction (250-2 000 μm),of 9％ for the fine sand-size fraction (50-250 μm),and of 5％ for the silt-size fraction (20-50 μm).The WESOC and SOC in particle-size fractions both peaked in March and reached the minimum in May/June and August,respectively.These results indicate the importance of the time of soil sampling during the course of a year,especially when investigating WESOC.

机译：土壤中的碳分数显然不仅随空间变化，而且随着时间变化。由于对耕地下不稳定碳分数的季节性变化缺乏了解，妨碍了来自不同研究的土壤有机碳（SOC）调查的可靠性和可比性。我们研究了玉米种植过程中两个有机碳组分（颗粒有机物（POM）和溶解性有机碳（DOC））的季节变化：以POM为颗粒级分中的SOC含量，以水萃取性为DOC风干土壤的SOC（WESOC）。由于土壤中的碳和氮循环密切相关，因此测量了铵，硝酸盐和水萃取性氮作为WESOC形成的潜在调节因素.WESOC的年变化显着变化（CV）-30％）。颗粒级分中SOC的时间变化小于WESOC。颗粒级分中SOC的存量随着部件的减少而减少粒径，粗砂级分（250-2 000μm）的CV为20％，细砂级分（50-250μm）的CV为9％，粉砂级的CV为5％颗粒级分的WESOC和SOC分别在3月达到峰值，并分别在5月，6月和8月达到最小值。这些结果表明，在采样过程中土壤采样时间的重要性一年，尤其是在调查WESOC时。

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《土壤圈（英文版）》 |2017年第2期|380-386|共7页
作者
Henning SCHIEDUNG; Ludger BORNEMANN; Gerhard WELP;
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Institute of Crop Science and Resource Conservation,Soil Science and Soil Ecology,Nussallee 13,University of Bonn,53115 Bonn(Germany);

Institute of Crop Science and Resource Conservation,Soil Science and Soil Ecology,Nussallee 13,University of Bonn,53115 Bonn(Germany);

Institute of Crop Science and Resource Conservation,Soil Science and Soil Ecology,Nussallee 13,University of Bonn,53115 Bonn(Germany);

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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);
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正文语种 eng
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Seasonal Variability of Soil Organic Carbon Fractions Under Arable Land

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