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近10年中国典型农田生态系统水体pH和矿化度变化特征

Decadal variations in pH and salinity of waters in typical agro-ecosystems in China
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摘要 选取中国生态系统研究网络(CERN)12个典型农田生态系统,2004-2006年和2014-2016年降水、地表水、地下水pH和矿化度的监测数据,分析中国典型农田生态系统10年间pH和矿化度的变化特征.结果表明,红壤丘陵区降水、地表水、地下水pH最低.10年间桃源、千烟洲降水pH显著降低,且2014-2016年pH<5.60,为酸沉降;地表水pH为红壤丘陵区(6.33-6.89)低于其余地区(7.61-8.19),10年间桃源、海伦地表水pH降低1.39和0.35,而鹰潭、千烟洲地表水pH升高0.77和1.19;地下水pH为南方红壤丘陵区(5.55-7.45)、东北平原(6.71-7.46)低于其余地区(7.62-8.27).10年间栾城地下水pH降低0.60,而盐亭、千烟洲地下水pH增加0.47和0.78;地表水矿化度为黄淮海平原>黄土高原>东北平原>长江三角洲>川中丘陵>红壤丘陵区.其中禹城(936-1183 mg·L^-1)最高,鹰潭和千烟洲最低(25-87 mg·L^-1).10年间桃源和千烟洲地表水矿化度降低138 mg·L^-1和62 mg·L^-1,其余农田生态系统变化不显著;地下水矿化度禹城(1594-2094 mg·L^-1)最高,为Ⅳ类地下水(1000-2000 mg·L^-1);封丘、栾城、安塞、常熟、盐亭、沈阳(319-750 mg·L^-1)其次,为Ⅲ类(500-1000 mg·L^-1)或Ⅱ类(300-500 mg·L^-1);其余生态系统达Ⅰ类(<300 mg·L^-1)地下水标准.10年间禹城地下水矿化度增加500 mg·L^-1,沈阳、长武、盐亭、千烟洲、常熟站、桃源降低102-384 mg·L^-1.不同空间格局、地质结构差异、化石燃料燃烧、人类活动(耕作、施肥、灌溉)是造成农田生态系统各水体pH和矿化度变化的主要原因.本研究结果为生态系统水体酸碱度、矿化度评估及其长期动态变化提供数据依据. Twelve typical agro-ecosystems of the Chinese Ecosystem Research Network(CERN) were chosen to analyze the temporal and spatial variations in water pH and salinity of China′s typical agro-ecosystems by using the data of pH of rainwater,surface water and groundwater,and salinity collected during 2004-2006 and 2014-2016.The results show that,the pH of rainwater,surface water and groundwater was lowest in the red soil hilly region,and the rainwater pH decreased significantly during the past 10 years in the Taoyuan and Qianyanzhou,reaching the level of acid deposition with pH<5.60 during 2014-2016.Surface water pH was lower in the red soil hilly region(6.33-6.89) than other regions(7.61-8.19).During the observation period(2004-2006 and 2014-2016),the surface water decreased by 1.39 and 0.35 in Taoyuan and Hailun,respectively,while increased by 0.77 and 1.19 in the Yingtan and Qianyanzhou,respectively.Groundwater pH was lower in the red soil hilly(5.55-7.45) and Northeast plain regions(6.71-7.46) than other regions(7.62-8.27).During this period,groundwater pH decreased by 0.60 in the Luancheng,while it increased by 0.47 and 0.78 in the Yanting and Qianyanzhou,respectively.Surface water salinity varied in the order of Huanghuaihai Plain > Loess Plateau > Northeast Plain > Yangtze River Delta > Middle Sichuan Hilly > red soil hilly region.Among them,surface water salinity was highest in Yucheng(936-1183 mg·L^-1),and lowest in Yingtan and Qianyanzhou(25-87 mg·L^-1).During this period,the surface water salinity decreased by 138 mg·L^-1 in Taoyuan and 62 mg·L^-1 in Qianyanzhou,respectively,but did not change significantly in other agro-ecosystems.Groundwater salinity was highest in Yucheng(1594-2094 mg·L^-1),which was classified as type IV of water quality(1000-2000 mg·L^-1).Next to Yucheng,Fengqiu,Luancheng,Ansai,Changshu,Yanting and Shenyang(319-750 mg·L^-1) were all classified as type Ⅲ(500-1000 mg·L^-1) or type Ⅱ(300-500 mg·L^-1) of water quality.Other ecosystems were classified as type Ⅰ of water quali
作者 刘旭艳 张心昱 袁国富 朱治林 唐新斋 孙晓敏 LIU Xuyan;ZHANG Xinyu;YUAN Guofu;ZHU Zhilin;TANG Xinzhai;SUN Xiaomin(Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,100190,China)
出处 《环境化学》 CAS CSCD 北大核心 2019年第6期1214-1222,共9页 Environmental Chemistry
基金 国家重点研发计划(2017YFC0503801)资助.
关键词 中国生态系统研究网络(CERN) 农田生态系统 PH 矿化度 时空变化 Chinese Ecosystem Research Network(CERN) agro-ecosystems pH salinity temporal and spatial variations
作者简介 通讯联系人:张心昱,Tel:010-64889679,E-mail:zhangxy@igsnrr.ac.cn;通讯联系人:孙晓敏,Tel:010-64889762,E-mail:sunxm@igsnrr.ac.cn.
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