Effects of organic manures with different carbon-to-nitrogen ratios on soil microbial biomass of organic agriculture
Effects of organic manures with different carbon-to-nitrogen ratios on soil microbial biomass of organic agriculture
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DOI：
10.3724/sp.j.1011.2013.01073
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发表时间：
2013
影响因子：
--
通讯作者：
Wang Li
中科院分区：
文献类型：
--
作者：
Wang Li
施用有机肥可以提高土壤微生物活性，改善土壤质量。碳氮比对有机肥料的高效利用至关重要。通过盆栽试验，研究了不同碳氮比有机肥在相同氮水平下对土壤微生物量的影响。在5个处理中，4个处理采用不同碳氮比（20︰1、15︰1、10︰1和5︰1）的有机肥处理，另一个处理采用不施肥处理（CK）。结果表明：施用有机肥均能提高土壤微生物量C和n含量，不同处理土壤微生物量C含量的顺序为20︰1 10︰1≈15︰1 5︰1 CK；不同处理土壤微生物生物量氮含量的顺序为15︰1 10︰1 20︰1 5︰1 CK。土壤微生物生物量C/N反映了土壤氮生物活性。不同处理土壤微生物生物量C/N的变化顺序为15︰1 10︰1 20︰1≈5︰1 CK。结果表明，碳氮比为15或10︰1的有机肥料能提高土壤氮的生物活性，减少氮的流失。高碳氮比（20︰1）的有机肥处理土壤微生物量较高，但土壤氮的生物活性较低。低碳氮比（5︰1）的有机肥处理土壤微生物生物量较低。该研究为有机农业中有机肥的科学利用奠定了理论和实践基础。
It was possible to increase soil microbial activity and improve soil quality by using organic fertilizers.Carbon-to-nitrogen ratio is critical for high efficiency of organic fertilizer.A pot experiment was conducted to determine the effects of organic fertilizers with different carbon-to-nitrogen ratios on soil microbial biomass at the same level of nitrogen.Of the five treatments used in the study,four received organic manure in different carbon-to-nitrogen ratios(20︰1,15︰1,10︰1 and 5︰1) and another was non fertilizer treatment(CK).The results showed that all of the treatments with organic fertilizers increased soil contents of microbial biomass C and N.The order of soil microbial biomass C content for different treatments was 20︰1 10︰1 ≈ 15︰1 5︰1 CK.Also the order of soil microbial biomass N content for different treatments was 15︰1 10︰1 20︰1 5︰1 CK.The soil microbial biomass C/N reflected soil nitrogen biological activity.The order of soil microbial biomass C/N for different treatments was 15︰1 10︰1 20︰1 ≈ 5︰1 CK.This suggested that organic manures with 15︰1 or 10︰1 carbon-to-nitrogen ratios improved biological activity of soil nitrogen and decreased nitrogen loss.Although soil microbial biomass was high under fertilization of organic manure with a high(20︰1) carbon-to-nitrogen ratio,biological activity of soil nitrogen was low.Soil microbial biomass was low under treatment of organic manure with a low(5︰1) carbon-to-nitrogen ratio.The study laid the theoretical and practical bases for the scientific use of organic manure in organic agriculture.