施肥对红壤性水稻土有机碳活性和难降解性组分的影响
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Effects of fertilization on lability and recalcitrancy of organic carbon of red paddy soils
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    摘要:

    以稻田22a施肥定位试验为样地,分别采用硫酸和盐酸加热水解两种方法,研究施肥对水稻土有机碳活性和难降解性组分的影响。不同施肥处理包括不施肥(CK)、单施氮肥(N)、单施磷肥(P)、单施钾肥(K)、氮磷肥混施(NP)、氮钾肥混施(NK)、氮磷钾肥混施(NPK)、二倍氮磷钾肥混施(2NPK)、氮磷钾和有机肥配施(NPK+OM)。结果表明,两种酸解法获得的有机碳分组结果高度相关 (P<0.05)。与对照相比,施肥总体上有助于土壤总有机碳的积累;除了单施钾肥处理外,其它施肥处理都提高了土壤活性有机碳的含量,但是仅单施N及NPK+OM处理表现为土壤有机碳活性指数(LIC)的显著提高,并且以NPK+OM处理的促进作用最显著(P<0.05)。与对照相比,除了单施N处理外,不同施肥下土壤中难降解有机碳(酸解残余碳)的含量都有增加的趋势,也以NPK+OM处理的促进作用最显著(P<0.05);单施K肥显著提高有机碳的难降解性(P<0.05),但单施N和NPK+OM处理显著降低有机碳的难降解性指数(RIC,P<0.05)。施氮肥和有机肥对土壤总有机碳含量的促进作用主要体现在活性有机碳的贡献上。因此,可以通过优化施肥措施(如选择合适有机肥种类、减施氮肥和增施钾肥等)来调控水稻土有机碳的含量及稳定性。

    Abstract:

    Labile and recalcitrant organic carbon fractions of red paddy soils under different fertilization practices for 22a were analyzed by two acid hydrolysis methods with H2SO4 and HCl, respectively. The fertilization treatments include: (1) CK,(2) N,(3) P,(4) K,(5) NP,(6) NK,(7) NPK,(8) 2NPK,(9) NPK+OM. Results showed that the two acid hydrolyzed methods agreed with each other very well. Compared to the CK without anything amendments, fertilization generally increased total organic carbon contents of paddy soil. Except the treatment K with only potassium fertilizer, labile organic carbon contents increased in other fertilization treatments. However, only N and NPK+OM treatments promoted Labile index (LIC) of organic carbon significantly (P<0.05), and especially the LIC in NPK+OM increased to a great extent. Also compared to the CK, fertilization, but not N treatment, consistently increased the recalcitrant carbon contents with the effects of NPK+OM being more significant (P<0.05). In terms of Recalcitrance index (RIC), significantly higher RIC was found in K treatment but the lower values found in N and NPK+OM treatments (P<0.05), indicating the contribution of N fertilizer and organic manure to total organic contents being mainly attributed to the labile organic carbon. Therefore, our results imply that we can manipulate red paddy soil organic carbon contents and stability by optimizing fertilization practices, possibly through selecting appropriate organic amendments, reducing N fertilization and enhancing K fertilization.

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陈小云,郭菊花,刘满强,焦加国,黄欠如,赖涛,李辉信,胡锋.施肥对红壤性水稻土有机碳活性和难降解性组分的影响[J].土壤学报,2011,48(1):125-131. DOI:10.11766/trxb200902050043 Chen Xiaoyun, Guo Juehu, Liu Manqiang, Jiao Jiaguo, Huang Qianru, Lai Tao, Li Huixin, Hu Feng. Effects of fertilization on lability and recalcitrancy of organic carbon of red paddy soils[J]. Acta Pedologica Sinica,2011,48(1):125-131.

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  • 收稿日期:2009-02-05
  • 最后修改日期:2009-07-28
  • 录用日期:2009-09-09
  • 在线发布日期: 2010-10-19
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