...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Oecologia >Growth of ectomycorrhizal mycelia and composition of soil microbial communities in oak forest soils along a nitrogen deposition gradient
【24h】

Growth of ectomycorrhizal mycelia and composition of soil microbial communities in oak forest soils along a nitrogen deposition gradient

机译：氮沉降梯度下橡树林土壤中菌根菌丝体的生长和土壤微生物群落组成

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Deciduous forests may respond differently from coniferous forests to the anthropogenic deposition of nitrogen (N). Since fungi, especially ectomycorrhizal (EM) fungi, are known to be negatively affected by N deposition, the effects of N deposition on the soil microbial community, total fungal biomass and mycelial growth of EM fungi were studied in oak-dominated deciduous forests along a nitrogen deposition gradient in southern Sweden. In-growth mesh bags were used to estimate the production of mycelia by EM fungi in 19 oak stands in the N deposition gradient, and the results were compared with nitrate leaching data obtained previously. Soil samples from 154 oak forest sites were analysed regarding the content of phospholipid fatty acids (PLFAs). Thirty PLFAs associated with microbes were analysed and the PLFA 18:2ω6,9 was used as an indicator to estimate the total fungal biomass. Higher N deposition (20 kg N ha−1 y−1 compared with 10 kg N ha−1 y−1) tended to reduce EM mycelial growth. The total soil fungal biomass was not affected by N deposition or soil pH, while the PLFA 16:1ω5, a biomarker for arbuscular mycorrhizal (AM) fungi, was negatively affected by N deposition, but also positively correlated to soil pH. Other PLFAs positively affected by soil pH were, e.g., i14:0, a15:0, 16:1ω9, a17:0 and 18:1ω7, while some were negatively affected by pH, such as i15:0, 16:1ω7t, 10Me17:0 and cy19:0. In addition, N deposition had an effect on the PLFAs 16:1ω7c and 16:1ω9 (negatively) and cy19:0 (positively). The production of EM mycelia is probably more sensitive to N deposition than total fungal biomass according to the fungal biomarker PLFA 18:2ω6,9. Low amounts of EM mycelia covaried with increased nitrate leaching, suggesting that EM mycelia possibly play an important role in forest soil N retention at increased N input.
机译：落叶林与针叶林对人为沉积氮的反应可能不同。由于已知真菌（尤其是外生菌根真菌）会受到氮沉降的负面影响，因此在橡树为主的落叶林中，研究了氮沉降对土壤微生物群落，真菌总生物量和菌丝生长的影响。瑞典南部的氮沉降梯度。在N沉积梯度下，使用生长网眼袋估算EM真菌在19个橡树林中的菌丝体产量，并将结果与​​先前获得的硝酸盐浸出数据进行比较。分析了来自154个橡树林地的土壤样品中磷脂脂肪酸（PLFA）的含量。分析了与微生物相关的30种PLFA，并将PLFA 18：2ω6,9用作指示剂，以估计真菌总生物量。较高的氮沉积量（20 kg N ha-1 y-1 与10 kg N ha-1 y-1 相比）倾向于降低EM菌丝体的生长。土壤真菌的总生物量不受氮沉降或土壤pH值的影响，而丛枝菌根（AM）真菌的生物标志物PLFA 16：1ω5受氮沉降的负面影响，但与土壤pH值呈正相关。其他受到土壤pH值正向影响的PLFA例如i14：0，a15：0、16：1ω9，a17：0和18：1ω7，而有些受到pH负向影响的土壤，例如i15：0、16：1ω7t，10Me17 ：0和cy19：0。另外，N沉积对PLFA 16：1ω7c和16：1ω9（负）和cy19：0（正）有影响。根据真菌生物标志物PLFA 18：2ω6,9，EM菌丝体的产生可能比总真菌生物量对N沉积更敏感。少量的EM菌丝体与硝酸盐淋失增加相关，表明在增加的氮输入下，EM菌丝体可能在森林土壤氮的保持中起重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号