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草业学报 ›› 2020, Vol. 29 ›› Issue (9): 85-93.DOI: 10.11686/cyxb2019513

• 研究论文 • 上一篇    下一篇

施肥对高寒草原草地质量指数及土壤性质影响的综合评价

郭剑波1, 赵国强1, 贾书刚2,*, 董俊夫1,3, 陈龙1, 王淑平1,*   

  1. 1.中国科学院大学资源与环境学院,北京 100049;
    2.广西地标作物大数据工程技术研究中心,北部湾环境演变与资源利用教育部重点实验室,南宁师范大学,广西 南宁 530001;
    3.中国科学院大学生命科学学院,北京 100049
  • 收稿日期:2019-11-26 修回日期:2020-02-11 出版日期:2020-09-20 发布日期:2020-09-20
  • 通讯作者: E-mail: wshuping@ucas.edu.cn, jiasg@itpcas.ac.cn
  • 作者简介:郭剑波(1994-), 男, 山西忻州人, 在读硕士。E-mail: guojianbo17@mails.ucas.ac.cn
  • 基金资助:
    国家自然科学基金重点项目(41230750)资助

Comprehensive evaluation of effects of fertilization on grassland quality index and soil properties in alpine steppe

GUO Jian-bo1, ZHAO Guo-qiang1, JIA Shu-gang2,*, DONG Jun-fu1,3, CHEN Long1, WANG Shu-ping1,*   

  1. 1. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;
    2. Guangxi Geographical Indication Crops Research Center of Big Data Mining and Experimental Engineering Technology, Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Nanning Normal University, Nanning 530001, China;
    3. College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-11-26 Revised:2020-02-11 Online:2020-09-20 Published:2020-09-20

摘要: 本研究以西藏自治区班戈县的典型高寒草原为研究对象,设置田间小区控制试验,于2013-2015年施加不同数量氮磷肥(N: 0、7.5、15.0 g N·m-2, P: 0、7.5、15.0、30.0 g P2O5·m-2), 调查各处理不同类群植物生物量、分析土壤理化性质,进而评价氮磷养分添加对高寒草原草地质量和土壤环境质量的影响。试验结果表明:1)氮磷配施优于氮磷肥单施,不同氮磷配施处理均能提高草地质量指数(IGQ),以N1P1(7.5 g N·m-2, 7.5 g P2O5·m-2)施肥处理的草地质量指数最大(90.27),相较对照增加了67.16%(P<0.05)。2)选择土壤有机质(OM),全氮(TN)、全磷(TP)、有效氮(AN)、有效磷(AP)和pH作为土壤环境质量评价指标, 应用主成分分析法对不同土层(0~10 cm、10~20 cm、20~30 cm) 12个施肥处理的土壤理化性质进行分析。结果表明,短期施肥主要影响土壤0~10 cm土层环境质量的变化;增施氮肥土壤pH呈下降趋势;高磷添加处理(30.0 g P2O5·m-2)增加了土壤全磷、有效磷含量,但植物吸收效率下降。3)结合草地质量指数和土壤理化性质变化进行草地质量综合评价,结果表明氮磷肥配施好于单施,且N1P1(7.5 g N·m-2,7.5 g P2O5·m-2)处理相对得分最高,为本试验条件下的适宜施肥量。

关键词: 高寒草原, 草地质量指数, 氮磷添加, 土壤性质, 主成分分析

Abstract: This research investigated the effects of fertilization on degraded alpine steppe in the Tibetan Plateau, and aimed to comprehensively assess the quality of this alpine grassland based on the index of grassland quality (IGQ) and soil properties. A field experiment was conducted in Bange County with three different N and four different P fertilization levels [N: 0 (N0), 7.5 (N1), 15.0 (N2) g N·m-2; P: 0 (P0), 7.5 (P1), 15.0 (P2), 30.0 (P3) g P2O5·m-2] in a factorial combination, with 12 N-P combinations, and N0P0 as control. The aboveground biomass of different vegetation communities and soil physical and chemical properties were assessed within the controlled experiment. It was found that combined application of nitrogen and phosphorus improved the IGQ, but only the treatment N1P1 (N: 7.5 g N·m-2, P: 7.5 g P2O5·m-2) had a significant effect on IGQ, which under tis treatment was increased by 67.16% compared with control. Data for soil organic matter, total nitrogen and phosphorus, available nitrogen and phosphorus, and pH under the 12 different treatments for three soil depths (0-10 cm, 10-20 cm, 20-30 cm) were subjected to principal component analysis. The results showed that soil pH is negatively correlated with total nitrogen and available nitrogen, and fertilization had a greater impact on soil quality in the 0-10 cm soil layer than in the 10-20 cm and 20-30 cm soil layers. The high P level (30.0 g P2O5·m-2) of fertilizer application increased soil total phosphorus and available phosphorus content but had an adverse effect on plant absorption rate. In summary, N : P fertilization (except treatments N0P1, N1P0) improved grassland quality, and N1P1 had the highest relative score. Hence, moderate N : P fertilization plays a positive role in improving grassland quality and soil fertility in the alpine steppe on the Tibetan Plateau. Further study is necessary to understand the restoration effect of manure.

Key words: alpine steppe, IGQ, N : P fertilization, soil properties, PCA