不同施肥处理对黑垆土各粒级团聚体中有机碳含量分布的影响
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中国科学院知识创新工程重要方向项目(KZCX2-YW-424-2)、国家自然科学基金项目(40771125,30871451)、黄土高原土壤侵蚀与旱地农业国家重点实验室专项经费(No 10502-Z11)资助


Effect of fertilization on organic carbon distribution in various fractions of aggregates in caliche soils
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    摘要:

    依托中国科学院黄土高原长武农业生态试验站中的长期定位试验(始于1984年),利用湿筛法获得不同粒径的团聚体,研究了长期施肥对不同粒级水稳性团聚体中有机碳分布的影响。试验涉及化肥和轮作培肥两个长期试验的9个处理。化肥试验:同一施磷基础上的5个施氮水平(N0、N45、N90、N135、N180);轮作培肥试验:不施肥(CK)、化肥(NP)、有机肥(M)、化肥有机肥配施(NPM)。结果表明:长期施肥显著影响土壤水稳性团聚体含量(p<0.05),提高了>2mm粒级水稳性团聚体含量,降低了<0.25mm水稳性团聚体含量。施氮(N45、N90、N135、N180)处理主要提高了>5mm、0.5~0.25mm水稳性团聚体中有机碳的含量,与N0相比,提高量为44.3%~73.3%;有机肥(M、NPM)处理对各粒级团聚体中有机碳的含量均有提高,与CK相比,提高量为40.7%~92.2%,其中>5mm团聚体中有机碳含量分别提高了66.7%和92.2%。低氮(N0、N45、N90)处理、不施肥(CK)处理的1~0.5mm团聚体中的有机碳对土壤有机碳的贡献率最大,占13.7%~23.7%;高氮(N135、N180)处理和氮磷配施(NP)处理、有机肥(M、NPM)处理的>5mm团聚体中的有机碳对土壤有机碳的贡献率最大,占17.3%~24.9%。土壤有机碳与>5mm、5~2mm 团聚体含量呈显著正相关关系,与<0.25mm团聚体含量呈极显著负相关。

    Abstract:

    Various particle-size fractions of soil aggregates were obtained with the wet-screening method from the soil of a long-term stationary fertilization experiment (since 1984) field of the Changwu State Key Loess Plateau Agro-Ecological Experimental Station of the Chinese Academy of Sciences, Northwest China, for analysis of effect of long term fertilization on soil organic carbon distribution in water-stable aggregates of different particle-size fractions. The experiment had five N treatments (N0、N45、N90、N135、N180), which were all the same in P application rate, and four fertilization treatments, that is, CK (unfertilized), NP (nitrogen and phosphorus), M (farmyard manure), and NPM (nitrogen and phosphorus plus farmyard manure). Results show that long-term fertilization significantly affected water-stable aggregates distribution (p<0.05), increasing the content of macro aggregates (>2 mm) and decreasing that of micro aggregates (<0.25 mm). Nitrogen fertilization significantly increased soil organic carbon (SOC) content in the 0.5~0.25 mm and>5mm water-stable aggregates by 44.3%~73.3%, compared to that in Treatment N0. Moreover, Treatments M and NPM increased SOC content in aggregates of all particle sizes by 40.7%~92.2% over CK, and in the >5 mm aggregates by 66.7% and 92.2%, respectively. Treatments N0、N45、N90 and CK contributed the most to the soil organic carbon content in the 1~0.5 mm water-stable aggregates, accounting for 13.7%~23.7%. Treatments N135、N180, NP, M and NPM contributed the most to the SOC content in the>5 mm aggregates, accounting for 17.3%~24.9%. SOC was positively related to the content of the>5 mm and 5~2 mm water-stable aggregates, but negatively related to the content of the<0.25 mm water-stable aggregates.

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高会议,郭胜利,刘文兆,车升国,李淼.不同施肥处理对黑垆土各粒级团聚体中有机碳含量分布的影响[J].土壤学报,2010,47(5):931-938. DOI:10.11766/trxb200908110343 gaohuiyi. Effect of fertilization on organic carbon distribution in various fractions of aggregates in caliche soils[J]. Acta Pedologica Sinica,2010,47(5):931-938.

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  • 收稿日期:2009-08-11
  • 最后修改日期:2010-04-06
  • 录用日期:2010-04-26
  • 在线发布日期: 2010-07-05
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