img

官方微信

高级检索

中国沙漠 ›› 2022, Vol. 42 ›› Issue (3): 274-281.DOI: 10.7522/j.issn.1000-694X.2021.00135

• • 上一篇    

短期增温和降水减少对沙质草地土壤微生物量碳氮和酶活性的影响

王怀海1,2(), 黄文达1(), 何远政1,2, 牛亚毅1,2, 朱远忠1,2   

  1. 1.中国科学院西北生态环境资源研究院 奈曼沙漠化研究站,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
  • 收稿日期:2021-07-02 修回日期:2021-10-29 出版日期:2022-05-20 发布日期:2022-06-01
  • 通讯作者: 黄文达
  • 作者简介:黄文达(E-mail: huangwenda2008@163.com
    王怀海(1995—),男,甘肃民乐人,硕士研究生,研究方向为生态学。E-mail: 1464190715@qq.com
  • 基金资助:
    国家自然科学基金项目(41971144);国家重点研发计划项目(2017FY100205)

Effects of short-term warming and precipitation reduction on soil microbial biomass carbonnitrogen and enzyme activity in sandy grassland

Huaihai Wang1,2(), Wenda Huang1(), Yuanzheng He1,2, Yayi Niu1,2, Yuanzhong Zhu1,2   

  1. 1.Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-07-02 Revised:2021-10-29 Online:2022-05-20 Published:2022-06-01
  • Contact: Wenda Huang

摘要:

通过模拟气候变化,探究短期增温和降水减少对沙质草地土壤微生物量碳氮及酶活性的影响,揭示沙质草地土壤微生物量碳氮和酶活性对短期气候变化的响应规律。结果表明:(1)短期增温和降水减少对土壤微生物量碳氮和酶活性均产生显著影响。(2)在自然温度下,与自然降水相比,降水减少40%时土壤微生物量碳(MBC)和微生物氮(MBN)含量最高,增幅分别为87.9%和98.8%;降水减少60%时土壤碱性蛋白酶(S-ALPT)活性最低,降幅达32.8%。(3)在增温条件下,与自然降水相比,降水减少40%时土壤MBC和MBN含量最低,降幅分别为25.67%和48.16%,土壤脲酶(S-UE)活性最高,增幅20.42%。(4)土壤pH与3种土壤酶活性正相关,与土壤微生物量碳氮负相关。土壤微生物量碳氮与土壤纤维素酶(S-CL)活性负相关,与S-UE、S-ALPT活性正相关。

关键词: 增温, 降水减少, 沙质草地, 土壤微生物量碳氮, 土壤酶活性

Abstract:

In this study, we simulated climate change to explore the effects of short-term warming and precipitation reduction on soil microbial biomass carbon, nitrogen and enzyme activities in sandy grassland plant communities, and further revealed the response rules of soil microbial biomass carbon, nitrogen and enzyme activities in sandy grassland to short-term climate change. The results showed that:(1) Short-term warming and precipitation reduction had significant effects on soil microbial biomass carbon, nitrogen and enzyme activities. (2) Under natural temperature, soil MBC and MBN contents in precipitation decreased by 40% increased by 87.9% and 98.8%, respectively. S-ALPT activity was the lowest in precipitation decreased by 60%, which decreased by 32.8%. (3) Under the warming condition, soil MBC and MBN contents were the lowest when precipitation decreased by 40%, with a decrease of 25.67% and 48.16%, respectively. S-UE content was the highest, and the increase range was 20.42%. (4) Soil pH was positively correlated with the activities of three soil enzymes, negatively correlated with soil microbial biomass carbon and nitrogen. Soil microbial biomass carbon and nitrogen were negatively correlated with S-CL, and positively correlated with S-UE and S-ALPT.

Key words: warming, precipitation reduction, sandy grassland, microbial biomass carbon and nitrogen, soil enzyme activity

中图分类号: