Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (10): 2265-2273.DOI: 10.11733/j.issn.1007-0435.2021.10.018

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Effects of Microbial Fertilizer on Aboveground Biomass and Soil Physiochemical Properties of Degraded Alpine Meadow

REN Zuo-ran1, SHAO Xin-qing1, LI Jin-sheng1, LI hui1, HE Yi-xuan1, GU Wei-na1, WANG Ru-ying1, YANG Ling-jing1, LIU Ke-si1,2,3   

  1. 1. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China;
    2. National Field Station of Grassland Ecosystem, Guyuan, Hebei Province 076550, China;
    3. Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Qinghai Province, Xining, Qinghai Province 810008, China
  • Received:2021-03-15 Revised:2021-05-21 Online:2021-10-15 Published:2021-11-05

微生物菌肥对退化高寒草甸地上生物量和土壤理化性质的影响

任卓然1, 邵新庆1, 李金升1, 李慧1, 何宜璇1, 古维娜1, 王茹颖1, 杨灵婧1, 刘克思1,2,3   

  1. 1. 中国农业大学草业科学与技术学院, 北京 100193;
    2. 河北沽源草地生态系统国家野外科学观测研究站, 河北 沽源 076550;
    3. 中国科学院西北高原生物研究所青海省寒区恢复生态学重点实验室, 青海 西宁 810008
  • 通讯作者: 刘克思,E-mail:kliu@cau.edu.cn
  • 作者简介:任卓然(2000-),女,在读本科生,主要从事退化草地生态恢复研究,E-mail:2352778038@qq.com
  • 基金资助:
    中美双边学术交流-微生物-植物间信息交流项目;国家重点研发计划(2016YFC0501902,2018YFF0213405);国家创新创业项目(202010019080)资助

Abstract: This study took the degraded alpine meadow in Guinan County, Qinghai Province, as the object to evaluate the effects of different application gradients (150 mL·m-2, 200 mL·m-2and 250 mL·m-2) of microbial fertilizer rich in lactic acid bacteria and acetobacter aceti on aboveground biomass and soil physicochemical properties of degraded alpine grassland. Results showed that the aboveground biomass of vegetation increased significantly with the increase of the application amount and time of microbial fertilizer, and increased up to 184.24% in the third year compared with the control. In 0~10 cm soil layer, soil organic carbon (TOC) and total nitrogen (TN) increased with the increase of microbial fertilizer. In the 10~20 cm soil layer, TOC and TN showed a significant increase only when the application amount of bacterial fertilizer was 250 mL·m-2, reaching 37.49 g·kg-1 and 3.32 g·kg-1, respectively. Soil ammonium nitrogen increased significantly in the first two years and then decreased, while nitrate-nitrogen content increased significantly in the third year, reaching 18.25 mg·kg-1 at 250 mL·m-2 microbial fertilizer application. Soil available P content increased significantly with the increase of application rate and time. It indicated that microbial fertilizer had the potential to improve soil physicochemical properties in the restoration of degraded alpine grassland.

Key words: Alpine grassland, Microbial fertilizer, Soil remediation, Grassland restoration, Soil physicochemical property

摘要: 本研究以青海省贵南县退化高寒草甸为对象,评估了富含乳酸菌和醋酸杆菌的微生物菌肥在不同的添加梯度(150 mL·m-2,200 mL·m-2和250 mL·m-2)下对高寒退化草甸地上植被生物量和土壤理化性质的影响。研究发现:地上植被的生物量随着微生物菌肥施用量和施用时间的增加整体上呈增加趋势,最大值均出现在施用量为200 mL·m-2的处理,分别为192.32 g·m-2(2017年),191.76 g·m-2(2018年)和202.68 g·m-2(2019年),菌肥施用处理第三年的地上植被生物量比对照高184.24%;土壤有机碳(Total organic carbon,TOC)和全氮(Total nitrogen,TN)含量在0~10 cm土壤表层中均在施用量为200 mL·m-2处理达到最大,在10~20 cm土层中,TOC和TN在菌肥施用量为250 mL·m-2时增加至37.49 g·kg-1和3.32 g·kg-1;土壤铵态氮含量在微生物菌肥施用前两年显著增加而后下降,而硝态氮含量在施用第三年显著增加。土壤有效磷含量随施用量和施用时间的增加整体上呈增加趋势。结果表明富含乳酸菌和醋酸杆菌的微生物菌肥在退化高寒草地修复中具有改善土壤理化性质的潜力。

关键词: 高寒草地, 微生物菌肥, 土壤改良, 草地恢复, 土壤理化性质

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