摘要
通过研究模拟增温和施氮条件下,丛枝菌根真菌(Arbuscular mycorrhizal fungi,AMF)对草甸草原土壤有机碳储量和团聚体稳定性的影响机制,结果发现:增温、施氮和添加苯菌灵处理对大土壤团聚体质量百分比和团聚体稳定性均无显著影响,但增温显著降低微土壤团聚体或提高土壤粘粒组分的质量百分比和稳定性(P<0.05)。施氮和增温条件下添加苯菌灵,土壤有机碳、总碳、活性有机碳(可溶性有机碳和微生物量碳)含量及土壤有机碳储量均显著增加(P<0.05),土壤有机碳储量与大团聚体稳定性之间存在显著正相关关系(P<0.05)。综上所述,AMF可通过加速土壤有机质分解来减少土壤碳储量并降低松嫩草地土壤团聚体的稳定性,AMF对土壤有机碳储量和土壤团聚体稳定性的影响受温度升高和氮沉降影响显著。
This study explored the mechanism that how arbuscular mycorrhizal fungi(AMF)affect soil organic carbon storage and soil aggregate stability in meadow grassland under simulated warming and nitrogen addition conditions.The results showed that simulated warming,and nitrogen and benomyl addition had no significant effects on the percentage of macroaggregates and the stability of aggregates.Simulated warming significantly reduced or improved the percentage and stability of soil microaggregates and clay particles(P<0.05).Under simulated warming and nitrogen addition conditions,benomyl addition increased the contents of soil organic carbon,total carbon and active organic carbon(soluble organic carbon and microbial biomass carbon),and soil organic carbon storage.Moreover,there was a significant positive correlation between soil organic carbon storage and soil macroaggregate stability(P<0.05).In conclusion,AMF can reduce soil carbon storage and decrease the stability of soil aggregates in Songnen grassland by accelerating the decomposition of soil organic matter.The effects of AMF on soil organic carbon storage and aggregate stability were significantly affected by warming and nitrogen deposition.
作者
赵双
张涛
石连旋
郭继勋
ZHAO Shuang;ZHANG Tao;SHI Lian-xuan;GUO Ji-xun(Institute of Grassland Science,Northeast Normal University/Key Laboratory of Vegetation Ecology,Ministry of Education,Changchun 130024,China)
出处
《中国草地学报》
CSCD
北大核心
2021年第9期97-106,共10页
Chinese Journal of Grassland
基金
国家自然科学基金项目(31770359)
吉林省科技厅自然基金项目(20200201115JC)
中央高校基本科研业务项目(2412020ZD010)。
关键词
草甸草原
增温
氮添加
土壤团聚体
土壤碳储量
Meadow steppe
Warming
Nitrogen addition
Soil aggregates
Soil carbon storage
