首页|Nitrate in shallow groundwater in typical agricultural and forest ecosystems in China, 2004-2010

Nitrate in shallow groundwater in typical agricultural and forest ecosystems in China, 2004-2010

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The nitrate-nitrogen (NO3--N) concentrations from shallow groundwater wells situated in 29 of the Chinese Ecosystem Research Network field stations,representing typical agro-and forest ecosystems,were assessed using monitoring data collected between 2004 and 2010.Results from this assessment permit a national scale assessment of nitrate concentrations in shallow groundwater,and allow linkages between nitrate concentrations in groundwater and broad land use categories to be made.Results indicated that most of the NO3--N concentrations in groundwater from the agro-and forest ecosystems were below the Class 3 drinking water standard stated in the Chinese National Standard:Quality Standard for Ground Water (＜ 20 mg/L).Over the study period,the average NO3--N concentrations were significantly higher in agro-ecosystems (4.1 ±-0.33 mg/L) than in forest ecosystems (0.5 + 0.04 mg/L).NO3--N concentrations were relatively higher (＞ 10 mg N/L) in 10 of the 43 wells sampled in the agricultural ecosystems.These elevated concentrations occurred mainly in the Ansai,Yucheng,Linze,Fukang,Akesu,and Cele field sites,which were located in arid and semiarid areas where irrigation rates are high.We suggest that improvements in N fertilizer application and irrigation management practices in the arid and semi-arid agricultural ecosystems of China are the key to managing groundwater nitrate concentrations.

Chinese Ecosystem Research Networkshallow groundwateragriculturalforest ecosystemsnitrate concentration

Xinyu Zhang、Zhiwei Xu、Xiaomin Sun、Wenyi Dong、Deborah Ballantine

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Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

National Institute of Water and Atmospheric Research, Hamilton, New Zealand

This research was supported by the Key Direction in Knowledge Innovation Program of Chinese Academy of Sciences国家自然科学基金

KZCX2-EW-31041171153

2013

10.1016/S1001-0742(12)60139-9

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

CSTPCDCSCDSCIEI
影响因子：0.862
ISSN：1001-0742
年,卷(期)：2013.25(5)
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