不同施肥措施对华北平原土壤有机碳的影响

发布时间：2018-05-27 04:28

本文选题：华北平原 + 土壤有机碳　；参考：《水土保持学报》2016年06期

【摘要】：选取河北省曲周县的长期定位试验,于2012年6月采集不施肥(CK)、常规施化肥(CF)、低量EM堆肥(EML)和高量EM堆肥(EMH)4种施肥处理的土壤,结合物理分组、密度分组和粒径分组将土壤划分为大、中、小团聚体组分、颗粒有机碳组分(POM)和矿质组分,探究0—10,10—20,20—60,60—100cm 4个土层中不同组分SOC的变化规律。结果表明:经过19年的耕作,在0—10cm土层,与CK处理相比,3个施肥处理(CF、EML、EMH)可以显著提高全土以及各个组分的SOC含量(33%~63%);10cm以下土层,仅2个有机肥处理可以提高20%~67%的SOC含量。对于0—100cm土层,与CK相比,EMH处理对土壤有机碳密度的增加速率(1.17tC/(hm2·a))是化肥处理(CF)的11.7倍。0—10cm土层3个施肥处理(CF、EML、EMH)条件下,20μm矿质组分SOC饱和度(65%~82%)显著高于CK处理(64%),10cm以下土层,CK、CF、EML处理之间SOC饱和度(50%)无显著差异,但EMH处理SOC饱和度显著高于另3个处理。研究表明,长期施肥条件下应关注10cm以下土层SOC的变化;对于土壤SOC水平较低的华北平原,土壤固碳空间较大,其中有机肥是较为有效的农田管理措施。
[Abstract]:In June 2012, four kinds of fertilization treatments were collected from Quzhou County, Hebei Province, including non-fertilized CK, conventional chemical fertilizer, low quantity EM compost (EMLL) and high quantity EM compost (EMHN), and combined with physical grouping. The soil was divided into large, medium and small aggregates, particulate organic carbon (POM) and mineral components by density grouping and particle size grouping. The variation of SOC in 0-1010-20 ~ 20-60 ~ (60) cm soil layers was investigated. The results showed that after 19 years of tillage, compared with CK treatment, the SOC content of the whole soil and its components were significantly increased by 3 fertilization treatments in the 0-10cm soil layer, and only 2 organic fertilizer treatments could increase the SOC content by 20 ~ 67% in the soil layer below 10 cm, and in the soil layer below 10 cm in each component, only 2 organic fertilizer treatments could increase the SOC content by 20% or 67%. For 0-100cm soil, Compared with CK, the increase rate of soil organic carbon density in EMH treatment (1.17t C / hm ~ 2 / hm ~ (2 / A) is 11.7 times of that in chemical fertilizer treatment. 0 ~ 10cm soil layer. The SOC saturation of 20 渭 m mineral component (SOC) is significantly higher than that in CK treatment, which is higher than that in CK treatment under 6440 cm soil layer and 10 cm soil layer. There was no significant difference in SOC saturation between the two groups. However, SOC saturation in EMH treatment was significantly higher than that in other 3 treatments. The results showed that under the condition of long-term fertilization, attention should be paid to the change of SOC in soil layer below 10cm, and soil carbon sequestration space was larger in North China Plain, where the level of soil SOC was lower, and organic fertilizer was a more effective measure for farmland management.
【作者单位】：中国农业大学资源与环境学院;
【基金】：国家“948”重点项目(2011-G30) 国家科技支撑项目(2012BAD14B01) 国家自然科学基金项目(31261140367,31370527)
【分类号】：S153.6

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