NDLI: Variation characteristics of nitrogen concentrations through forest hydrologic subcycles in various forests across mainland China

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sun, Suqi Wang, Yunqi Wang, Yujie Zhang, Huilan Yu, Lei Liu, Yong Zhu, Jinqi
Spatial Coverage	China
Description	Author Affiliation: Sun S ( a Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education , Beijing Forestry University , Tsinghua East Road No. 35, Haidian District, Beijing 100083 , People's Republic of China.)
Abstract	Increased anthropogenic nitrogen emissions and more severe environmental issues (e.g. air pollution, soil acidification, and plant nutrient imbalances) are striking forest ecosystems. Data on NH4+ and NO3- concentrations in throughfall and stemflow were collected to estimate variation characteristics of nitrogen concentrations through forest hydrological processes across China. A typical study was carried out in the three forest types in the Jinyun Mountain region of Chongqing, from May to October 2012. Nitrogen concentrations in throughfall and stemflow are higher than those in atmospheric precipitation. DIN concentrations in atmospheric precipitation, throughfall, and stemflow, across China and in the Jinyun Mountain region, were 2.18 and 1.51, 3.19 and 3.88, and 5.14 and 3.92âmgâNâL(-1), respectively. NH4+ concentration was higher than NO3- concentration, suggesting NH4+ is the dominant nitrogen component in China. Additionally, across China, a linear relationship existed between DIN and NH4+, and between DIN and NO3- in atmospheric precipitation. DIN concentrations in throughfall and stemflow changed with the observed changes in precipitation, and DIN concentrations in precipitation positively correlated with those in throughfall and in stemflow were also observed. Moreover, average DIN concentrations in throughfall and stemflow varied in different forest types, resulting from differences in forest canopy structures and tree species characteristics. In the Jinyun Mountain region, both throughfall and stemflow DIN concentrations were the highest in the mixed broadleaved/coniferous forest, followed by evergreen broadleaved forest, and the lowest in moso bamboo forest. Monthly variations of NH4+ and NO3- concentrations, in throughfall and stemflow, were observed in the Jinyun Mountain region.
File Format	HTM / HTML
ISSN	09593330
Issue Number	13-16
Volume Number	36
e-ISSN	1479487X
Journal	Environmental Technology
Language	English
Publisher	Taylor & Francis
Publisher Date	2015-07-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Air Pollutants Pharmacokinetics Forests Nitrogen Metabolism Plant Leaves Plant Stems Trees Analysis China Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Waste Management and Disposal Medicine Water Science and Technology

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