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应用生态学报 ›› 2009, Vol. 20 ›› Issue (09): 2207-2213.

• 研究报告 • 上一篇    下一篇

不同供氮水平对施用玉米秸秆后黑土氨基糖转化的影响

丁雪丽1,2;何红波1;白震1,2;解宏图1;张彬1,2;张旭东1,3   

  1. 1中国科学院沈阳应用生态研究所陆地生态过程重点实验室| 沈阳 110016;2中国科学院研究生院| 北京 100039;3沈阳农田生态系统国家野外科学观测研究站| 沈阳 110016
  • 收稿日期:2008-12-29 出版日期:2009-09-20 发布日期:2009-09-20

Effects of nitrogen supply level on microbial transformation of amino sugar in a mollisol amended with maize straw.

DING Xue-li1,2;HE Hong-bo1;BAI Zhen1,2;XIE Hong-tu1;ZHANG Bin1,2;ZHANG Xu-dong1,3   

  1. 1Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China|2Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3National Field Research Station of Shenyang Agro-ecosystems, Shenyang 110016, China
  • Received:2008-12-29 Online:2009-09-20 Published:2009-09-20

摘要: 采用室内恒温(25 ℃)培养方法,设置4个氮素添加水平(0、60.3、167.2、701.9 mg N·kg-1,依次标记为N0、Nlow、Nmid、Nhig),培养38周,研究不同无机氮素添加水平对施入玉米秸秆黑土的氨基糖转化的影响.结果表明:与对照样品相比,添加秸秆可显著促进氨基糖的微生物合成与积累,且在培养前期氨基糖的总量随着无机氮素添加水平的增加而增加,Nmid和Nhig处理氨基糖积累量显著高于Nlow和N0处理;随着培养时间的延长氨基糖总量有所下降,Nlow和N0处理的下降幅度高于Nmid和Nhig处理.不同无机氮素供应水平对各氨基单糖的影响也有所不同,以胞壁酸为代表的细菌细胞壁物质比真菌细胞壁残留物如氨基葡萄糖更易受到土壤碳氮供给的影响,但真菌细胞壁物质对土壤有机质的截获和稳定作用大于细菌.说明对于C/N较大的玉米秸秆,土壤中无机氮素的供给对氨基糖在土壤中的积累转化有明显影响,氮素缺乏会抑制微生物生长,使氨基糖的合成作用减弱,在微生物体中截获的氮源减少,不利于土壤氮素的积累.

关键词: 氨基糖, 转化, 供氮水平, 玉米秸秆, 土壤, 荒漠区, 赤霞珠, 滴灌, 地面覆盖, 根系分布

Abstract: A 38-week laboratory incubation test at 25 ℃ was conducted to examine the effects of different inorganic N supply level (0, 603, 1672, and 7019 mg N·kg-1 soil, noted as N0, Nlow, Nmid, and Nhig, respectively) on the microbial transformation of amino sugar in a mollisol amended with maize straw. Comparing with the control, the amendment of maize straw promoted the microbial synthesis of amino sugar, and at the early period of incubation, the total amount of soil amino sugar increased with increasing inorganic N supply, being significantly higher in treatments Nmid and Nhig than in treatments N0 and Nlow. With prolonged incubation time, the total amount of soil amino sugar decreased, and the decrement was higher in treatments N0 and Nlow than in treatments Nmid and Nhig. Different inorganic N supply level also had different effects on the dynamics of various amino sugars. Muramic acid exclusively originated from bacteria was more easily to be affected by the inorganic N supply, compared with the glucosamine from fungal cell wall residues. For the amendment of higher C/N maize straw, a sufficient N supply would be necessary for the promotion of the accumulation and transformation of soil amino sugar. Soil N deficiency would restrict the growth of soil microbes, weaken the microbial synthesis of amino sugar, and decrease the captured N in microbial biomass, being not beneficial to the soil N accumulation.

Key words: amino sugar, transformation, nitrogen supply level, maize straw, soil, desert area, grapevine ‘Cabernet Sauvignon’, drip irrigation, soil mulching, root distribution.