Acta Agrestia Sinica ›› 2018, Vol. 26 ›› Issue (5): 1104-1108.DOI: 10.11733/j.issn.1007-0435.2018.05.010

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Effects of Cutting Root and Nitrogen Application on Soil Physical and Chemical Properties of Degraded Leymus chinensis Grassland

CHEN Ji-shan1, KONG Xiao-lei1, ZHU Rui-fen1, ZHANG Qiang1, DI Gui-li1, KANG Xintong1, LU Juan2   

  1. 1. Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Science, Harbin, Heilongjiang Province 150086, China;
    2. Lanzhou Botanical Garden, Lanzhou, Gansu Province 730070, China
  • Received:2018-03-19 Revised:2018-08-14 Online:2018-10-15 Published:2018-11-06

切根和施氮对退化羊草草地土壤理化性质的影响

陈积山1, 孔晓蕾1, 朱瑞芬1, 张强1, 邸桂俐1, 康欣彤1, 陆娟2   

  1. 1. 黑龙江省农业科学院草业研究所, 黑龙江省 哈尔滨 150086;
    2. 甘肃省兰州植物园, 甘肃 兰州 730070
  • 作者简介:陈积山(1979-),男,副研究员,主要从事牧草栽培及草地管理研究,E-mail:cyszps@163.com
  • 基金资助:
    国家重点研发计划(2016YFC0500607-2);黑龙江省自然科学基金(C2018058)资助

Abstract: A two-year splitting plot test was conducted in the Songnen degraded Leymus chinensis grassland by cutting roots and applying nitrogen. The results showed that T-shaped root cutting (Q40) significantly reduced soil bulk density compared to the strip-shaped cutting method (Q20). Under the condition of root cutting,nitrogen application significantly increased soil total nitrogen and organic matter. The yield of Q40N4 was 310.91+10.623 g·m-2,which was significantly higher than that of the control and other treatments. The yield of Q40N2 was 208.10+14.326 g·m-2. Correlation and canonical correspondence analysis (CCA) showed that the actual contribution of soil physical and chemical factors to grassland biomass was only 34.23%. Monte Carlo substitution test showed that this explanation was credible,and P was the main soil limiting factor significantly affecting the annual yield of grassland in the region. Therefore,it is suggested to increase the use of phosphate fertilizer and remove the long-term P limitation of grassland soil in this region to obtain higher grassland biomass.

Key words: Cutting root, Nitrogen application, Degraded Leymus chinensis grassland, Soil physical and chemical properties, Biomass

摘要: 通过切根施氮在松嫩退化羊草草地开展连续2年的二裂式裂区试验。结果表明,井字型切根(Q40)较条形切根方式(Q20)显著降低了土壤容重。切根条件下,施氮处理显著提高土壤全氮和有机质。在所有切根施氮组合中,组合Q40N4(井字型切根宽度40cm方式下施氮4 kg·亩-1)产量为310.91±10.623 g·m-2,显著高于对照及其他处理,其中Q40N2处理的产量最少,为208.10±14.326 g·m-2。相关性分析和典范对应分析(CCA)表明,土壤理化因子对草地生物量的实际贡献仅为34.23%。经蒙特卡罗置换检验表明,这种解释是可信的,且磷(P)元素是显著影响该区域草地全年产量的主要土壤限制因子。因此,在提高该区域羊草草地生物量方面,建议加大对磷肥的使用量,解除该区域草地土壤存在的长期磷限制,以获得较高的草地生物量。

关键词: 切根, 施氮, 退化羊草草地, 土壤理化性质, 草地生物量

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