| 土壤活性有机碳周年变化对紫云英翻压量的响应 |
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| 引用本文： | 程会丹,鲁艳红,聂军,朱启东,聂鑫,曹卫东,高雅洁,廖育林.土壤活性有机碳周年变化对紫云英翻压量的响应[J].土壤,2021,53(4):723-731. |
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| 作者姓名： | 程会丹 鲁艳红 聂军 朱启东 聂鑫 曹卫东 高雅洁 廖育林 |
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| 作者单位： | 湖南大学,湖南省土壤肥料研究所,湖南省土壤肥料研究所,湖南省土壤肥料研究所,湖南省土壤肥料研究所,中国农业科学院农业资源与农业区划研究所,湖南省土壤肥料研究所,湖南省土壤肥料研究所 |
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| 基金项目： | 国家重点基础研究发展计划（973计划） |
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| 摘 要： | 为了探索紫云英替代化肥的生态效应和适宜翻压量,以11年(2008—2018年)长期定位试验为对象,研究了紫云英不同翻压量下土壤活性有机碳(AOC)的季节变化。在稻–稻–紫云英轮作体系典型时期(紫云英翻压前、早稻分蘖盛期、早稻成熟期、晚稻分蘖盛期、晚稻成熟期)采集土壤样品,分析土壤总有机碳(TOC)、AOC及其组分微生物生物量碳(MBC)、可溶性有机碳(DOC)等的变化。结果表明:与对照处理相比,减量40%化肥下紫云英各翻压量处理提高了土壤TOC含量;与常规施肥处理相比,减量化肥配合不同量紫云英翻压处理不同程度地提高了土壤AOC、MBC及DOC含量,且均随紫云英翻压量的增加呈先增加后下降的变化趋势,AOC含量以翻压紫云英30.0t/hm2时最高,MBC和DOC含量以翻压紫云英22.5t/hm2时最高;取样时期对土壤MBC、DOC含量及MBC/TOC、DOC/TOC比值有较大的影响,其随取样时期进展呈先降低后升高再降低的变化趋势;在土壤性质相对稳定的晚稻成熟期,AOC/TOC、MBC/TOC、DOC/TOC比值在一定范围随紫云英翻压量的增加而增加,超过一定量时,AOC/TOC、MBC/TOC比值无明显变化,DOC/TOC比值则显著下降(P0.05)。因此,在本试验减施化肥条件下长期翻压紫云英有利于提高土壤AOC含量及比例,以紫云英翻压22.5～30.0 t/hm2效果最好。
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| 关 键 词： | 紫云英 土壤活性有机碳 微生物量碳 可溶性有机碳 碳素有效率 |
| 收稿时间： | 2020/4/9 0:00:00 |
| 修稿时间： | 2020/6/11 0:00:00 |
Responses of Annual Variation of Soil Active Organic Carbon to Chinese Milk Vetch Application Rates |
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| CHENG Huidan,LU Yanhong,NIE Jun,ZHU Qidong,NIE Xin,CAO Weidong,GAO Yajie,LIAO Yulin.Responses of Annual Variation of Soil Active Organic Carbon to Chinese Milk Vetch Application Rates[J].Soils,2021,53(4):723-731. |
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| Authors: | CHENG Huidan LU Yanhong NIE Jun ZHU Qidong NIE Xin CAO Weidong GAO Yajie LIAO Yulin |
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| Institution: | hunan university,Soil and Fertilizer Institute of Hunan Province,Soil and Fertilizer Institute of Hunan Province,Soil and Fertilizer Institute of Hunan Province,Soil and Fertilizer Institute of Hunan Province,Agricultural Resource and Agricultural Division Institute of Chinese Academy of Agricultural Sciences,Soil and Fertilizer Institute of Hunan Province,Soil and Fertilizer Institute of Hunan Province |
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| Abstract: | Abstract: To explore the suitable application rate and the ecological effect of substitution of chemical fertilizer by Chinese milk vetch, an eleven-year field experiment was conducted to investigate the annual variation of active organic carbon concentration and efficiency under different incorporation rates of Chinese milk vetch. Soil samples were collected in the typical period of rice-rice-Chinese milk vetch rotation system, ie., before the incorporation of Chinese milk vetch (S1), tillering stage of early rice (S2), mature stage of early rice (S3), tillering stage of late rice (S4) and mature stage of late rice (S5), for analysis of soil microbial biomass carbon (MBC), dissolved organic carbon (DOC) concentrations and efficiencies. The results showed that the total organic carbon (TOC) concentration in soil treated with reduced chemical fertilizer combined with Chinese milk vetch was significantly higher than that of CK (P<0.05), and also higher than 100%CF, but did not reach significantly level. Compared with the 100%CF treatment, the application of reduced chemical fertilizer combined with Chinese milk vetch increased the concentrations of AOC, MBC and DOC to varying degrees. The concentrations of AOC, MBC and DOC increased first then decreased with the increased amount of Chinese milk vetch. The concentration of AOC was highest with 30.0 t/hm2 of Chinese milk vetch application, MBC and DOC were highest with 22.5 t/hm2 of Chinese milk vetch application. The AOC and DOC efficiency and microbial quotient of the incorporation of Chinese milk vetch with chemical fertilizer treatment was significantly higher than that of CK (P<0.05), and also higher than that of 100%CF treatment, but there were no significant effect on AOC and DOC efficiency and microbial quotient when the application amount of Chinese milk vetch was increased. The sampling period had a great influence on soil MBC, DOC concentrations and efficiency, which firstly decreased, then increased and then decreased. Comprehensively, the long-term cultivation Chinese milk vetch under a 40% reduced chemical fertilization is beneficial to increase soil organic carbon concentration and available ratio of soil carbon, the optimal application rate of Chinese milk vetch is 22.5-30.0 t/hm2. |
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| Keywords: | Chinese milk vetch active organic carbon microbial biomass carbon dissolved organic carbon available ratio of soil carbon |
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