等氮量条件下不同秸秆与化学氮肥配施对黑土团聚体稳定性及其碳、氮分布的影响 |
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引用本文: | 刘金华,王银海,赵兴敏,王鸿斌.等氮量条件下不同秸秆与化学氮肥配施对黑土团聚体稳定性及其碳、氮分布的影响[J].土壤通报,2022,53(1):160-171. |
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作者姓名: | 刘金华 王银海 赵兴敏 王鸿斌 |
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作者单位: | 吉林农业大学农业资源与环境国家级实验教学示范中心/吉林省商品粮基地土壤资源可持续利用重点实验室,吉林 长春 130118 |
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基金项目: | 吉林省教育厅科学技术研究项目(JJKH20210340KJ)资助; |
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摘 要: | 目的]为正确评价秸秆替代部分化学氮肥对黑土水稳性团聚体组成及其碳、氮分布的影响,达到肥料减施增效的目的,方法]采用田间小区试验的方法,在总施氮量240kghm-2下,设置不施秸秆与化肥,单施化肥和25%、50%、75%、100%秸秆还田配施减量化学氮肥6个处理,经过5轮施肥处理,种植5年春玉米后,采集表层土壤,测定...
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关 键 词: | 秸秆还田 化肥减施 团聚体稳定性 碳储量 氮储量 |
收稿时间: | 2020-11-27 |
Effect of Straw Combined with Chemical Fertilizer on Aggregates Stability and Distributions of Carbon and Nitrogen under Equal Nitrogen Application Rate in Black Soil |
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Institution: | National Experimental Teaching Demonstration Center for Agricultural Resources and Environment, Jilin Agricultural University/Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases in Jilin Province, Changchun 130118, China |
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Abstract: | In order to accurately evaluate the effect of straw partial substituting chemical nitrogen fertilizer on the formation of soil water-stable aggregates and the distributions of carbon (C) and nitrogen (N) in black soil, achieving the goal of reducing fertilizer application and increasing fertilizer efficiency, a field trial was adopted at the total N applying amount of 240 kg hm?2 with 6 treatments of no straw and chemical N fertilizer, chemical N fertilizer alone, and 25%, 50%, 75% and 100% of straw return combined with correspondingly reduced chemical N fertilizer. The surface soil was collected to measure the composition of soil water-stable aggregates and their associated C and N concentrations, analyze the stability of aggregates and their storages of C and N after 5 applications of straw and fertilizer during 5 years of planting spring corn. The results showed that the treatments of straw return combined with chemical N fertilizer promoted the formation of macro aggregates, increased the contents of C and N in different aggregates fractions and total soil organic C storage relative to the treatment of chemical N fertilizer alone. But it had no significant effect on soil total N storage. Compared with 25% of straw return treatment, the treatments with more than 75% of straw return increased the aggregates contents of LM (> 2 mm) by 1.28% ~ 2.36% and that of cPOM (> 0.25 mm) by 3.63% ~ 4.76%, while decreased that of m (0.053 ~ 0.25 mm) and Msc (< 0.053 mm) by 2.29% ~ 3.08% and by 3.95% ~ 5.40%, respectively. Moreover, they also increased MWD by 6.57% ~ 9.28%. Although there was a significantly positive relationship between straw return amount and the contents of C and N in each aggregate fraction (except s + c), only the C and N storages of LM, mM, cPOM and the C storage of SM were significantly positive with straw return amount when considering the effect of aggregate composition. Whereas, the C and N storages in Msc were negatively correlated with straw return amount. Additionally, the C and N ratios in SM, cPOM and mM were not significantly improved when the straw return amount was less than 75%. In general, at total N applying rate of 240 kg hm?2, the combined application of 75% straw (10800 kg hm?2)and 186 kg hm?2 chemical N fertilizer significantly improved the stability of soil aggregates and the storage of organic C and total N, compared with chemical N fertilizer alone or 25% straw combined with reduced amount of chemical N fertilizer, and reduced the applying amount of N fertilizer by 22.5% relative to the treatment of N fertilizer alone. |
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