Tillage and N-fertilizer influences on selected organic carbon fractions in a North Dakota silty clay soil
Tillage and N-fertilizer influences on selected organic carbon fractions in a North Dakota silty clay soil
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DOI：
10.1016/j.still.2013.08.006
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发表时间：
2013-11-01
影响因子：
6.5
通讯作者：
Franzen, David
中科院分区：
文献类型：
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作者：
Awale, Rakesh;Chatterjee, Amitava;Franzen, David
SOC库的物理、化学和生物部分，例如粗颗粒有机物碳(CPOM-C)、高锰酸盐可氧化碳(KMnO4-C)、微生物生物量碳(MBC)和可矿化碳(Cmin)响应管理实践的变化，并比通常报告的单独的土壤总碳更敏感地指示SOC动态的变化。我们假设耕作和氮肥管理引起的 0-15 cm 土壤表层 SOC 的变化主要通过 SOC 不同部分的平行变化来反映。三个现场实验（实验1：2008-2011，实验2：2005-2011，实验3：2005-2011）在美国北达科他州法戈的法戈（典型Epiiaquerts）-瑞安（典型Natraquerts）粉质粘土杂岩中进行。我们的目标是 (i) 评估耕作（传统耕作 [CT]、条耕 [ST] 和免耕 [NT] 以及不同氮肥管理对 SOC、CPOM-C、KMnO4-C、MBC 和 Cmin 的影响，以及 (ii) 确定玉米 (Zea mays)-甜菜 (Beta vulgaris)-大豆 (Glycine max) 中这些 C 分数之间的关系 旋转。与CT相比。在 Expt2 中，ST 和 NT 的 SOC 浓度分别显着升高 3.8% 和 2.7%，SOC 库存显着升高 7.2% 和 9.2%，CPOM-C 显着升高 22% 和 25%，KMnO4-C 显着升高 4.8% 和 4.1%，并且 SOC 浓度显着升高 3.9% 和 6.6%，SOC 库存显着升高 11.9% 和 8.7%，CPOM-C Expt3 中分别提高了 33% 和 45%。的 Expt3 中，ST 下的 KMnO4-C 和 30 天累积 Cmin 分别比 CT 下高 3.3% 和 23%。在 Expt3 中，除 7 天外，整个潜伏期 ST 和 NT 下的 Cmin 量始终高于 CT。在整个研究中，CPOM-C 为 16.3-22.1%，MBC 为 3.4-4.5%，累积 Cmin 为 0.7-1.4%， KMnO4-C 占总 SOC 的 1.6-1.7%。在所有实验中，SOC、CPOM-C 和 Cmin 之间均观察到显着相关性。 CPOM-C 是对耕作变化最敏感的部分。耕作对SOC分数的影响顺序为：物理（CPOM-C）>生物（累积Cmin）>化学（KMnO4-C），但随土壤类型和轮作的顺序变化需要进一步研究。 调查。 (C) 2013 Elsevier B.V. 保留所有权利。
Physical, chemical, and biological fractions of SOC pools, such as coarse particulate organic matter C (CPOM-C), permanganate oxidizable C (KMnO4-C), microbial biomass carbon (MBC), and mineralizable C (Cmin) respond to changes in management practices and provide sensitive indication of changes in the SOC dynamics than commonly reported total soil C alone. We hypothesized that tillage and N-fertilizer managements induced changes in SOC at the surface 0-15 cm soil would predominantly be reflected by parallel changes in different fractions of SOC. Three field experiments (Expt1 : 2008-2011, Expt2: 2005-2011, Expt3: 2005-2011) were conducted in a Fargo (Typic Epiaquerts)-Ryan (Typic Natraquerts) silty clay complex in Fargo, North Dakota, USA. Our objectives were (i) to evaluate the effects of tillage (conventional till [CT], strip till [ST] and no-till [NT] and different N-fertilizer managements on SOC, CPOM-C, KMnO4-C, MBC, and Cmin and (ii) to determine any relationships among these C fractions within corn (Zea mays)-sugarbeet (Beta vulgaris)-soybean (Glycine max) rotation. Compared with CT. ST and NT had significantly higher SOC concentration by 3.8 and 2.7%, SOC stock by 7.2% and 9.2%, CPOM-C by 22 and 25%, and KMnO4-C by 4.8 and 4.1%, respectively in Expt2 and had significantly higher SOC concentration by 3.9 and 6.6%, SOC stock by 11.9 and 8.7%, and CPOM-C by 33 and 45%, respectively in Expt3. The KMnO4-C and 30 d cumulative Cmin were greater under ST than CT by 3.3 and 23%, respectively in Expt3. The amounts of Cmin were consistently higher under ST and NT than CT throughout the incubation period except at 7 d, in Expt3. Across the study, CPOM-C was 16.3-22.1%, MBC was 3.4-4.5%, cumulative Cmin was 0.7-1.4%, and KMnO4-C was 1.6-1.7% of the total SOC. Significant correlations were observed among SOC, CPOM-C and Cmin in all the experiments. CPOM-C was the most sensitive fraction to tillage changes. Tillage influences on SOC fractions followed the order: physical (CPOM-C) > biological (cumulative Cmin) > chemical (KMnO4-C), however, the sequence change with soil type and crop rotation requires further investigation. (C) 2013 Elsevier B.V. All rights reserved.