外源有机碳对黑土有机碳及颗粒有机碳的影响

发布时间：2018-11-13 12:59

【摘要】：为了阐释外源有机碳在土壤有机碳运转中的作用机制,以黑土为供试材料,进行了5年的室外培养试验,并结合室内全土及颗粒组分单独矿化培养试验,研究了不同外源有机碳对黑土有机碳(SOC)、颗粒有机碳(POC)含量及其矿化特征的影响。试验包括单施化肥、牛粪配施化肥、鸡粪配施化肥、秸秆配施化肥和树叶配施化肥5个处理。结果表明:(1)单施化肥黑土SOC的损失主要来源于POC的损失,外源有机碳有利于SOC和POC的累积,与对照相比,禽畜粪便处理的SOC和POC平均增加幅度分别为16.6%和27.8%,植物残体处理的SOC和POC平均增加幅度分别为27.0%和46.4%;(2)一级动力学方程能较好地描述SOC和POC的矿化动态(R~20.9),且POC比SOC易矿化,POC的60d累积矿化量是SOC的3倍以上;(3)禽畜粪便处理和植物残体处理的POC平均矿化率分别为31.5%和29.8%,禽畜粪便处理的POC更易矿化;(4)外源有机碳有效降低了黑土有机碳的矿化,尤其是牛粪,其SOC矿化率为1.9%,比对照低了3.4%,其POC矿化率为24.8%,比对照低17.4%;(5)外源有机碳在黑土中的碳累积能力表现为树叶秸秆牛粪鸡粪。
[Abstract]:In order to elucidate the mechanism of exogenous organic carbon in soil organic carbon transport, five years' outdoor culture experiment was carried out with black soil as the test material, and the indoor soil and particle components were separately mineralized. The effects of different exogenous organic carbon on the (POC) content and mineralization characteristics of organic carbon (SOC),) particles in black soil were studied. The experiment included five treatments: single fertilizer, cow manure with chemical fertilizer, chicken manure with chemical fertilizer, straw with chemical fertilizer and leaves with chemical fertilizer. The results showed that: (1) the loss of SOC in black soil was mainly due to the loss of POC, and exogenous organic carbon was beneficial to the accumulation of SOC and POC, compared with the control. The average increases of SOC and POC in livestock feces were 16.6% and 27.8% respectively, and the average increases of SOC and POC in plant residue treatment were 27.0% and 46.4%, respectively. (2) the first-order kinetic equation can better describe the mineralization dynamics of SOC and POC (RG20.9), and POC is more mineralized than SOC, and the cumulative mineralization amount of POC in 60 days is more than three times that of SOC; (3) the average POC mineralization rates of livestock manure treatment and plant residue treatment were 31.5% and 29.8%, respectively. The POC of livestock feces treatment was more likely to be mineralized; (4) exogenous organic carbon can effectively reduce the mineralization of organic carbon in black soil, especially cow dung. The mineralization rate of SOC is 1.9, which is 3.4 lower than that of the control, and the mineralization rate of POC is 24.8and 17.4cm lower than that of the control. (5) the carbon accumulation ability of exogenous organic carbon in black soil was as follows: leaf straw, cow manure, chicken manure.
【作者单位】：吉林农业大学资源与环境学院;吉林市农业科学院;
【基金】：吉林省科技厅重大科技招标专项(20150203004NY) 国家重点研发计划项目(2017YFD0201801)
【分类号】：S153.6

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