摘要
通过室内水田模拟培养试验,研究了淹水条件下稻草和硫酸铝添加对苏打盐碱土微生物量碳、易氧化有机碳及有机无机复合体的影响。结果表明,秸秆添加显著提高了土壤微生物量碳和微生物商,提升幅度分别为108.5%-310.3%和76.1%-178.3%,低量稻草添加更有利于土壤微生物量碳和微生物商的增加。硫酸铝能够进一步促进土壤微生物量碳的增加,且硫酸铝添加量与微生物量碳的含量呈正相关关系。在未添加稻草的处理中,添加硫酸铝能增加土壤易氧化有机碳含量,降低土壤有机碳的Kos值。添加稻草和硫酸铝均能不同程度的提高土壤易氧化有机碳的含量。Kos值随稻草添加量的增加呈先增加后减少的趋势,随硫酸铝添加量的增加呈增加趋势。秸秆添加促进较小粒级复合体向大粒级复合体团聚,同时提高了各粒级复合体内有机碳的含量。硫酸铝添加能够促进秸秆分解产生的有机胶体与无机颗粒形成有机无机复合体,促进土壤的团聚,同时提高大粒级有机无机复合体含量及有机碳含量。
The effects of rice straw and aluminum sulfate on soil microbial biomass carbon,easily oxidized organic carbon and organo-mineral complexes in soda saline-alkaline soil were investigated through a laboratory simulated incubation experiment.The results showed that soil microbial biomass carbon and microbial quotient increased by 108.5%to 310.3% and 76.1% to 178.3% respectively after rice straw was applied,and low level of rice straw application was more conducive to the increase of soil microbial biomass carbon and microbial quotient.Aluminum sulfate application could further promote the increase of soil microbial biomass carbon and the application amount of aluminum sulfate was positively correlated with soil microbial biomass carbon content.For the treatments without rice straw,the use of aluminum sulfate could increase the content of easily oxidized organic carbon,and decrease the Kos value of soil organic carbon.Both of rice straw and aluminum sulfate application could increase easily oxidized at different levels.With the increase of rice straw application,the value of Kos increased firstly and then decreased,but along with the aluminum sulfate increasing,the value of Kos took on the increasing trend.Rice straw application promoted the agglomerate from small size fraction of complex to large one,and meanwhile increased organic carbon content of complexes of different size.Aluminum sulfate application could advance organo-mineral complexes formed by organic colloid produced from straw decomposition and inorganic particles,promote the aggregation of soil,and also increase the content of large fraction of organo-mineral complexes and the content of organic carbon.
出处
《水土保持学报》
CSCD
北大核心
2015年第4期284-288,共5页
Journal of Soil and Water Conservation
基金
国家科技支撑计划项目“东北与黄淮海粮食主产区适应气候变化技术开发与应用”(2013BAC09B01)
公益性行业(农业)科研专项(201503116)
关键词
稻草
硫酸铝
微生物量碳
易氧化碳
有机无机复合体
rice straw
aluminum sulfate
microbial biomass carbon
easily oxidized organic carbon
organo-mineral complexes
