您好，欢迎访问辽宁省农业科学院 机构知识库！
辽宁省农业科学院机构知识库

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Nitrogen deposition linked to increased transpiration in Korean larch (Larix olgensis) depended on precipitation

文献类型： 外文期刊

作者： Wang, Ruizhao 1 ; You, Wenzhong 2 ; Yan, Tingwu 1 ; Feng, Jian 1 ; Zhang, Huidong 1 ;

作者机构： 1.Liaoning Acad Forestry, Shenyang 110032, Peoples R China

2.Liaoning Inst Econ Forestry, Dalian 116030, Peoples R China

关键词： Nitrogen deposition; Transpiration; Korean larch; Precipitation

期刊名称：PHYSICS AND CHEMISTRY OF THE EARTH （ 影响因子：3.311； 五年影响因子：3.419 ）

ISSN： 1474-7065

年卷期： 2021 年 123 卷

页码：

收录情况： SCI

摘要： Anthropogenic exogenous nitrogen input is essential for the hydrologic cycle in forest ecosystems and is of critical concern for forest hydrological partitioning. To investigate the impacts of nitrogen deposition on transpiration in Larix olgensis plantations, we manipulated nitrogen deposition using four nitrogen (N) treatments (LN: 20 kg N hm-2 a-1; MN:40 kg N hm-2 a- 1;HN:80 kg N hm-2 a-1; and control: CK). In these treatments, we examined the sap flow densities (Js), whole tree transpiration(Er), and canopy transpiration (Ec), and monitored the variation of environmental factors during three successive growing seasons from July 2015 to October 2017 in the northeastern China. 19 months were divided into three groups upon the different hydrothermal conditions. The results indicated that N addition generally increased the daily average Js, while the increment amplitude depended on water conditions. A nonlinear response of Er to N deposition was detected and varied with time; in addition, abundant precipitation may mitigate the Er increases induced by N deposition. Furthermore, N addition also enhanced Ec and promoted the percentage of Ec to precipitation, especially in rainless conditions. The significant linear positive correlation between daily average Js and Rs or VPD was found and the sensitivity of Js to Rs was weak, for the slope was relatively constant regardless of the amount of precipitation or N addition. On the contrary, the sensitivity of Js to VPD increased with N addition and was closely related with the hydrothermal conditions. These results suggested the complex influence of N deposition on plant transpiration depended on precipitation and may aggregate drought pressure.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：辽宁省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台