Soil Aggregate Stability and Aggregate-Associated Carbon Under Different Tillage Systems in the North China Plain

DU Zhang-liu; REN Tu-sheng; HU Chun-sheng; ZHANG Qing-zhong; Humberto Blanco-Canqui

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Soil Aggregate Stability and Aggregate-Associated Carbon Under Different Tillage Systems in the North China Plain

机译：华北平原不同耕作制度下土壤团聚体稳定性和团聚体相关碳

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The inlfuences of tillage systems on soil carbon (C) stocks have been studied extensively, but the distribution of soil C within aggregate fractions is not well understood. The objective of this study was to determine the inlfuences of various tillage systems on soil aggregation and aggregate-associated C under wheat (Triticum aestivum L.) and corn (Zea mays L.) double cropping systems in the North China Plain. The experiment was established in 2001, including four treatments:moldboard plow (MP) with residue (MP+R) and without residue (MP-R), rotary tillage with residue (RT), and no-till with residue (NT). In 2007 soil samples were collected from the 0-5, 5-10, and 10-20 cm depths, and were separated into four aggregate-size classes (>2 000, 250-2 000, 53-250, and<53 µm) by wet-sieving method. Aggregate-associated C was determined, and the relationships between total soil C concentration and aggregation-size fractions were examined. The results showed that NT and RT treatments signiifcantly increased the proportion of macroaggregate fractions (>2 000 and 250-2 000 µm) compared with the MP-R and MP+R treatments. Averaged across all depths, mean weight diameters of aggregates (MWD) in NT and RT were 47 and 20% higher than that in MP+R. The concentration of bulk soil organic C was positively correlated with MWD (r=0.98; P=0.024) and macroaggregate fraction (r=0.96; P=0.036) in the 0-5 cm depth. In the 0-20 cm depth, comparing with MP+R, total C occluded in the>2 000 µm fraction was increased by 9 and 6%under NT and RT, respectively. We conclude that adoption of conservation tillage system, especially no-till, can increase soil macro-aggregation and total C accumulation in macroaggregates, which may improve soil C sequestration in the intensive agricultural region of the North China Plain.

机译：广泛研究了土壤碳（C）股上耕种系统的焊接，但骨料分数内的土壤C的分布并不顺利。本研究的目的是确定各种耕作系统对土壤（Triticum Aestivum L.）和玉米（Zea Mays L.）在华北平原的双重种植系统的土壤聚集和骨料相关C的接通。该实验成立于2001年，其中包括四种治疗方法：用残基（MP + R）和没有残留物（MP-R），旋转耕作，残留物（RT）的塑料耕地（MP），以及用残基（NT）的旋转耕作。从0-5,5-10和10-20cm深度收集土壤样品，分为四个骨料尺寸（> 2 000,250-200,53-250和<53μm ）通过湿法筛分方法。确定了聚合物相关的C，检查了总土壤C浓度与聚集尺寸级分之间的关系。结果表明，与MP-R和MP + R处理相比，NT和RT处理在与MP-R和MP + R处理相比，显着增加了大致缩略的馏分（> 2 000和250-2000μm）的比例。在所有深度上平均，NT和室温的聚集体（MWD）的平均重量直径为47％，高于MP + R中的20％。散装土壤有机C的浓度与MWD（r = 0.98; p = 0.024）呈正相关，并且在0-5cm深度中致宏观馏分（r = 0.96; p = 0.036）。在0-20cm的深度中，与MP + R相比，在> 2000μm级分中的总C封闭在NT和室温下越来越高。我们得出结论，采用保护耕作系统，尤其是缺乏，可以增加土壤宏观聚集和大型癌症中的总C累积，这可能改善华北平原密集农业区域的土壤C封存。

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《农业科学学报（英文版）》 |2013年第11期|2114-2123|共10页
作者
DU Zhang-liu; REN Tu-sheng; HU Chun-sheng; ZHANG Qing-zhong; Humberto Blanco-Canqui;
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作者单位

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China;

Center for Agricultural Resources Research, Institute of Genetics and Development Biology, Chinese Academy of Sciences, Shijiazhuang 050021, P.R.China;

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

Agricultural Research Center-Hays, Kansas State University, KS 67601-9228, USA;

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Soil Aggregate Stability and Aggregate-Associated Carbon Under Different Tillage Systems in the North China Plain

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