...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science of the total environment >Towards a mechanistic understanding of soil nitrogen availability responses to summer vs. winter drought in a semiarid grassland
【24h】

Towards a mechanistic understanding of soil nitrogen availability responses to summer vs. winter drought in a semiarid grassland

机译：在半干旱草原上对夏季冬季冬季干旱的土壤氮可用性反应的机械理解

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

More frequent and intense drought events resulting from climate change are anticipated to become important drivers of change for tetrestrial ecosystem function by affecting watet and nutrient cycles. In semiarid grasslands, the responses of soil nitrogen availability to severe drought and the underlying mechanisms are largely unknown. Moreover, the responses and mechanisms may vary between summer and winter drought. We examined soil nitrogen availability responses to extreme reductions in precipitation over summer and winter using a field experiment in a semiarid grassland located in northeast China, and we explored the mechanisms by examining associated changes in abiotic factors (soil property responses) and biotic factors (plant and soil microbial responses). The results demonstrated that both the summer and winter severe drought treatments significantly reduced plant and microbial biomass, whereas summer drought also changed soil microbial community structure. Summer drought, winter drought and combined summer and winter drought decreased the resistance of soil nitrogen availability by 38.7 ± 11.1%,43.3± 11.4% and 43.8 ± 6.0%, respectively. While both changes in abiotic factors (reduced soil water content and total nitrogen content) and biotic factors (reduced plant and microbial biomass) explained the resistance of soil nitrogen availability to drought over summer, only changes in biotic factors (reduced plant and microbial biomass) explained the legacy effect of winter drought. Our results highlight that severe drought can have important consequences for nitrogen cycling in semiarid grasslands, and that both the effects of summer and winter drought must be accounted for in predicting these responses.
机译：通过影响水下液和营养周期，预计气候变化导致气候变化导致的频繁和强烈的干旱事件将成为四雌生态系统功能的重要驱动因素。在半干旱草原中，土壤氮可用性对严重干旱和潜在机制的反应在很大程度上是未知数。此外，夏季和冬季干旱之间的反应和机制可能变化。我们使用位于中国东北地区的半干旱草原上的夏季和冬季，在夏季和冬季进行了极端减少的土壤氮可用性反应，我们通过检查非生物因素（土壤财产反应）和生物因子的相关变化来探索了机制（植物和土壤微生物反应）。结果表明，夏季和冬季严重干旱治疗显着降低了植物和微生物生物量，而夏季干旱也改变了土壤微生物群落结构。夏季干旱，冬季干旱和冬季和冬季干旱将土壤氮可用性的阻力下降38.7±11.1％，分别为43.3±11.4％和43.8±6.0％。虽然对非生物因子的变化（降低土壤含水量和总氮含量）和生物因子（降低的植物和微生物生物量）解释了土壤氮气可用性对夏季干旱的影响，但只有生物因子的变化（植物和微生物生物量减少）解释了冬季干旱的遗产效果。我们的结果强调，严重的干旱可能对半干旱草原上的氮气循环产生重要影响，并且必须占夏季和冬季干旱的影响，以便预测这些反应。

著录项

  • 来源
    《Science of the total environment》 |2020年第1期|140272.1-140272.11|共11页
  • 作者

    Xuechen Yang; Hugh A.L Henry; Shangzhi Zhong; Bo Meng; Chengliang Wang; Ying Gao; Wei Sun;

  • 作者单位

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

    Department of Biology University of Western Ontario London Ontario N6A 5B7 Canada;

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

    Key Laboratory of Vegetation Ecology Ministry of Education Institute of Grassland Science Northeast Normal University Changchun Jilin 130024 PR China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Abiotic factors; Biomass; Meadow steppe; Microbial community; Nutrient cycle; Seasonal severe drought;

    机译：非生物因素;生物质;草原草原;微生物群落;营养循环;季节性的严重干旱;

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