Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (9): 2759-2768.DOI: 10.11733/j.issn.1007-0435.2023.09.020

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Effects of Nitrogen and Phosphorus Addition on Net Nitrogen Mineralization in Grassland Soil in an Agro-pastoral Ecotone of Northern Shanxi

HAN Fei1,2,3, SU Yuan1,2,3, YANG Qian-wen1,2,3, WANG Ge1,2,3, CHANG Jie1,2,3, ZHAO Fang-cao1,2,3, DIAO Hua-jie1,2,3, DONG Kuan-hu1,2,3, WANG Chang-hui1,2,3   

  1. 1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
    2. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China;
    3. Youyu Plateau Grassland Ecosystem Research Station, Shanxi Agricultural University, Youyu, Shanxi Province 037200, China
  • Received:2023-03-14 Revised:2023-05-13 Online:2023-09-15 Published:2023-10-07

晋北农牧交错带草地土壤净氮矿化速率对氮磷添加的响应

韩菲1,2,3, 苏原1,2,3, 杨倩雯1,2,3, 王袼1,2,3, 常婕1,2,3, 赵芳草1,2,3, 刁华杰1,2,3, 董宽虎1,2,3, 王常慧1,2,3   

  1. 1. 山西农业大学草业学院, 山西 太谷 030801;
    2. 草地生态保护与乡土草种质创新山西省重点实验室, 山西 太谷 030801;
    3. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西 右玉 037200
  • 通讯作者: 董宽虎,E-mail:dongkuanhu@sxau.edu.cn;王常慧,E-mail:wangch@ibcas.ac.cn
  • 作者简介:韩菲(1999-),女,汉族,山东烟台人,硕士研究生,主要从事草地生态与管理研究,E-mail:xfw08042@163.com
  • 基金资助:
    自然科学基金区域创新发展联合基金重点项目(U22A20576)；国家重点研发计划子课题(2022YFF1302801)；山西省科技厅平台专项(202104010910017);山西农业大学高层次引进人才专项(2021XG008)资助

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Abstract: However,did the input of exogenous nutrients improve the productivity at the same time promote the N transformation process? Especially in the Agro-pastoral ecotone grassland ecosystem research is rarely reported. In order to explore the response of soil N mineralization to N and P addition,the soil net ammonification,net nitrification and net N mineralization rate were measured from 2020 to 2021 by using top-closed PVC cylinders based on the N and P addition experimental platform which was established in 2017 in Youyu Plateau Grassland Ecosystem Research Station,and the related biotic and abiotic indexes were also determined. The results showed that:N addition significantly increased soil inorganic nitrogen content and the net nitrification rate and the net nitrogen mineralization rate. N and P addition alone had no significant effect on the above-ground productivity of grassland,but the N and P addition significantly increased the above-ground productivity by 266%. In conclusion,N addition promoted the soil N transformation rate,but did not significantly improve the productivity of grassland in the Agricultural and pastoral ecotone of northern Shanxi Province. However,the N and P addition had no significant effect on the N transformation rate,but significantly improved the grassland productivity in this region. Therefore,it was speculated that the plant growth was limited by P after the single addition of N,and the N and P addition could significantly improve the productivity although it had no significant effect on the net N mineralization rate. Therefore,the dual restriction of N and P should be considered in the future grassland management in the agro-pastoral ectopic zone of northern Shanxi.

Key words: Nitrogen deposition, Leymus secalinus grassland, Net N mineralization rate, Agricultural and pastoral ecotone, Nutrient addition

摘要： 外源养分输入提高生产力是否同时促进了氮转化过程,尤其在农牧交错带脆弱草地生态系统的研究鲜见报道。为探究土壤氮转化关键过程对外源养分添加的响应,本研究依托山西右玉黄土高原草地生态系统国家定位观测研究站2017年建立的全球变化联网试验养分平台,采用原位顶盖PVC埋管法,测定了土壤氮转化速率,以及相关生物和非生物指标。结果表明:氮添加显著提高了土壤无机氮含量、土壤氮转化速率;氮磷同时添加显著提高了地上生产力。综上,氮添加促进了晋北农牧交错带草地土壤氮转化速率,但是没有显著提高生产力;氮磷同时添加对氮转化速率没有显著影响,但是显著提高了草地生产力,因此推测,单独氮添加后,植物生长受磷限制,同时添加氮磷,虽然对净氮矿化速率没有显著影响,但是能显著提升生产力,因此未来晋北农牧交错带草地管理应该考虑氮磷双重限制。

关键词: 氮沉降, 赖草草地, 净氮矿化速率, 农牧交错带, 养分添加

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