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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

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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 LXU 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

1


Outline

Introduction

Methods and materials

Hydrological regime

Water quality

Conclusions

2


Sanjiang wetland observatory

3


500mm

1000mm

900mm

500mm

Sanjiang

Catchments

Annual Precipitation: 500 mm

400mm

300mm

1200mm

4


Long-term mean monthly precipitation

5


Wetlands in Sanjiang Plain

2000

1950S

6


7


Past

Present

8


  • Significant drop in the water table has been observed: 4-8 meters in 5 years

9


Outline

Introduction

Methods and materials

Hydrological regime

Water quality

Conclusions

10


Wetland Monitoring

Water lever monitoring well

Evapo-transpiration data collection

11


Sampling groundwater

12


Sampling campaign in August 2011, along a 250km cross section. Monitoring of precipition has been continued in the mean time.


Sampling groundwater

W-E cross section in the southern part of the region, where groundwater and other water bodies have been sampled for stable isotopes and tritium measurements.

a、Cross Section

b、Schematic Hydrogeology


Sampling soil water

Description of the contents

Horizontal seepage Pipe

Horizontal seepage pond

Horizontal seepage channel

Horizontal seepage from the paddy field

15


Sampling soil water

16


Lab measurements & QA

DIONEX IC

liquid-water stable isotope instrument

17

ICP-OES

ICP-MS


Interlab comparison on Tritium measurements

累积测试偏差所有实验室排名

地质所

(引自IAEA “TRIC2008” 报告)


Tritium measurement

水同位素与水岩反应实验室


WICO2011 Interlab on stable isotopes

水同位素与水岩反应实验室


Rice field plot test

A test plot in a paddy field

21


Lab tests of constructed wetlands

22


Outline

Introduction

Methods and materials

Hydrological regime

Water quality

Conclusions

23


Groundwater monitoring in Honghe, Qianfeng and Qianshao farms

Decline of groundwater level

Well 1

Well 2

Well 3

24


Hydrological setting of Honghe wetland

P

ET

Inflow

Outflow

25


Before 1950s

26


Present

27


Hydrogeology profile of natural wetland

28


Mechanism of transport: Hydrogeology

29


Tritium in groundwater

30


Outline

Introduction

Methods and materials

Hydrological regime

Water quality

Conclusions

31


Groundwater quality

32


Groundwater nitrate


River water quality

Yalvhe

Nongjiang

Raolihe

  • Water quality of smaller rivers in the area has not been affected to a large extent by agricultural activities.

34


Soil water quality

35


Water in the rice fields

36


River water quality

Songhuajiang

Wusulijiang

37

Source: Environmental Ministry


Outline

Introduction

Methods and materials

Hydrological regime

Water quality

Conclusions

38


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.

39


Welcome to visit website of our lab at www.isoh2o.org

Thanks!谢谢!


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