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1 Assessment of the Impact of Reclaimed Lands for Rice Fields and Water Conservation Zones on Water Budget and Quality for Sustainable Agriculture in Northeast China PANG Z YUAN L KONG Y LUO L XU B z.pang@mail.iggcas.ac.cn Institute of Geology & Geophysics (IGG), Chinese Academy of Sciences (CAS) Beijing IAEA CN191/56, 24 July 12, Vienna
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2 Outline Introduction Methods and materials Hydrological regime Water quality Conclusions
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3 Sanjiang wetland observatory
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4 400mm 1000mm 900mm 500mm 1200mm Annual Precipitation: 500 mm 300mm Sanjiang Catchments
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5 Long-term mean monthly precipitation
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6 Wetlands in Sanjiang Plain 1950S 2000
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8 Past Present
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9 Significant drop in the water table has been observed: 4-8 meters in 5 years
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10 Outline Introduction Methods and materials Hydrological regime Water quality Conclusions
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11 Wetland Monitoring Water lever monitoring well Evapo-transpiration data collection
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12 Sampling groundwater
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Sampling campaign in August 2011, along a 250km cross section. Monitoring of precipition has been continued in the mean time.
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Sampling groundwater W-E cross section in the southern part of the region, where groundwat er and other water bodies have been sampled for stable isotopes and t ritium measurements. a Cross Section b Schematic Hydrogeology
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15 Horizontal seepage from the paddy field Description of the contents Horizontal seepage Pipe Horizontal seepage pond Horizontal seepage channel Sampling soil water
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16 Sampling soil water
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17 DIONEX IC ICP-OESICP-MS liquid-water stable isotope instrument Lab measurements & QA
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IAEA TRIC2008 Interlab comparison on Tritium measurements
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Tritium measurement IAEA TU TU 1σ T141.54 0.000.40A T154.073.960.110.45A T167.747.880.140.53A T1714.4614.890.430.53A T180.670.380.290.36A
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IAEA WICO2011 Sample δ 18 Oδ2Hδ2H δ2Hδ2H Δδ 18 OΔδ 2 H value1s uncvalue1s uncvalue1s uncvalue1s unc OH-13-0.960.04-2.30.9-0.860.06-2.10.33-0.10-0.2 OH-14-5.590.05-37.70.8-5.510.05-37.30.32-0.08-0.4 OH-15-9.370.04-78.00.8-9.340.06-77.50.31-0.03-0.5 OH-16-15.410.04-113.80.9-15.330.08-114.20.42-0.080.4 WICO2011 Interlab on stable isotopes
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21 Rice field plot test A test plot in a paddy field
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22 Lab tests of constructed wetlands
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23 Outline Introduction Methods and materials Hydrological regime Water quality Conclusions
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24 Groundwater monitoring in Honghe, Qianfeng and Qianshao farms Decline of groundwater level Well 1 Well 2 Well 3
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25 Hydrological setting of Honghe wetland ET P Inflow Outflow
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26 Before 1950s
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27 Present
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28 Hydrogeology profile of natural wetland
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29 Mechanism of transport: Hydrogeology
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Tritium in groundwater 30
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31 Outline Introduction Methods and materials Hydrological regime Water quality Conclusions
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32 Groundwater quality
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Groundwater nitrate
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34 YalvheNongjiang Raolihe Water quality of smaller rivers in the area has not been affected to a large extent by agricultural activities. River water quality
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35 Soil water quality
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36 Water in the rice fields
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37 Songhuajiang River water quality Wusulijiang Source: Environmental Ministry
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38 Outline Introduction Methods and materials Hydrological regime Water quality Conclusions
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39 Conclusions Conversion of natural wetlands into paddy rice fields has changed the hydrological regime of wetlands systems to different extents, depending on their hydrogeological settings. Deterioration of surface water quality has been observed, though insignificant. There is a clear correlation to agriclutural activites. Groundwater quality has not been affected on the whole, likely attributing to the slow infiltration into the aquifers. In places where groundwater doesn't receive adequate recharge, river water needs to be used to ensure sustainability.
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Welcome to visit website of our lab at www.isoh2o.org Thanks
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