...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tree Physiology >Five-year nitrogen addition affects fine root exudation and its correlation with root respiration in a dominant species, Quercus crispula, of a cool temperate forest, Japan
【24h】

Five-year nitrogen addition affects fine root exudation and its correlation with root respiration in a dominant species, Quercus crispula, of a cool temperate forest, Japan

机译：五年的氮气添加会影响细根渗出及其与日本凉爽的温带森林栎（Quercus Crispula）的细根渗出及其与根呼吸的相关性

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

In forest ecosystems, fine root respiration directly contributes to belowground carbon (C) cycling. Exudation from fine roots indirectly affects C cycling via enhanced microbial decomposition of soil organic matter. Although these root-derived C fluxes are essential components of belowground C cycling, how nitrogen (N) addition affects these fluxes and their correlations remains unclear. In this study, fine root exudation, respiration and chemical/morphological traits were measured in a dominant canopy species, Quercus crispula Blume, found in a cool temperate forest, the Tomakomai Experimental Forest, Hokkaido University, which has undergone 5-year N addition. Soil-dissolved organic carbon (DOC) was also measured in both bulk and rhizosphere soils to evaluate the impact of fine root exudation on soil C cycling. Compared with a control plot with no N treatment, fine roots in the N addition plot exhibited larger diameters and higher N concentrations, but lower specific root lengths and areas. On a root-weight basis, respiration was not different between plots, but exudation was slightly higher under N addition. On a root-area basis, exudation was significantly higher in the N addition plot. Additionally, differences in DOC between rhizosphere and bulk soils were two times higher in the N addition plot than the control plot. Although fine root respiration was positively correlated with exudation in both the control and N addition plots, the ratio of exudation C to respiration C decreased after 5-year N addition. Nitrogen addition also affected absolute C allocation to fine root exudation and changed the C allocation strategy between exudation and respiration fluxes. These findings will help enhance predictions of belowground C allocation and C cycling under N-rich conditions in the future.
机译：在森林生态系统中，细根呼吸直接有助于以下碳（c）循环。细根间接地通过增强土壤有机物质的微生物分解来间接地影响C循环。虽然这些根系衍生的C通量是地下C循环的基本组分，但是如何增加氮气（n）加法影响这些助熔剂，并且它们的相关性仍不清楚。在这项研究中，在一个凉爽的温带森林中，在一个凉爽的温带森林，北海道大学，北海道大学，北海道大学的普通冠层物种，呼吸渗透，呼吸和化学/形态学性质进行了细根渗出，呼吸和化学/形态学性状。土壤溶解的有机碳（DOC）也测量在散装和根际土壤中，以评估细根渗出对土壤C循环的影响。与NO治疗的对照图相比，N添加曲线中的细根表现出较大的直径和较高的N浓度，但较低的根长度和区域。在根重的基础上，呼吸在图之间没有差异，但在另外，渗出略高。在根区域的基础上，N添加图中的渗出显着高。另外，在根际和散装土壤之间的DOC差异比对照图的添加图中的氮在氮层中的两倍越高。尽管在对照和N添加地图中，细根呼吸与渗出性呈正相关，但在5年加入后，渗出C至呼吸的比率降低。氮添加也会影响绝对的C分配到细根渗出，并改变了渗出和呼吸助焊剂之间的C分配策略。这些调查结果将有助于加强对未来N-Rich条件下的低于地下C分配和C循环的预测。

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