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第三世界生态高峰会

作者： MA Q.L~(1,2) WANG J.H~2 1 Shapotou Desert Research and Experiment Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000.Gansu province,China 2 Gansu key lab of combating desertification,Gansu Desert Control Research Institute.Wuwei 733000,Gansu province,China

Tamarix *** played an important role m improving and maintaining the eco-environmental quality of desert areas in west ***, *** Ledeb,distributing widely along the edge of Minqin oasis in lower reaches of Shiyang river,had degraded seriously with the continual descent of groundwater level and decrease of surface water. Distribution,growth and driving forces of *** Forest were researched in lower reaches of Shiyang river to provide the objective basis for restoration of the degraded *** forest and rebuildation the wind-breaking and Sand-fixation *** Shajingzi in Minqin county,the permanent monitoring sites were established in 1959 to research succession process of *** *** addition,plot method was adopted to investigated quantity,biomass and growth status of *** population and species coposition, soil moisture and community stucture of *** communities along the edge of oasis or edge of *** the recent 40 years,the *** forest at Shajingzi was taking a succession toward ar;*** succession process was:***+Kalidium foliatum Moq/Karelinia caspica,or ***+Elaeagnus angustifolia L,Populus euphratica Olivier or *** Carr→ ***+Reamuria soongorica Maxim→*** x+ Nitraria Tangutorum or ***+***+Haloxylon ammodendron(artificial)→Nitraria Tangutorum+therophytes or ***+***(artificial).Compared the T. ramosissima forest in 1959,1992 and 2003,the belt width reduced from 500-1000m in 1959 to 30-75m in 2003,and the average height of T. ramosissima descented from 2.0m in 1959 to 1.52m in ***, in the recent decade years,it degraded more seriously,the coverage rate of *** community decreased by 1.03%,and of total vegetation decreased by 11.9%.The annual plants in the communities obviously *** the edge of Minqin oasis,*** forest can be artificially classified i

关键词： Tamarix spatial-temporal variation drive factor

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Analysis of the Groundwater System Change and Driving factors in Songnen Plain in Jilin Province

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Agricultural Science & Technology 2011年第5期12卷 741-744页

作者：郭晓东张晶田辉朱威张梅桂沈阳地质矿产研究所辽宁沈阳110034 吉林地质环境监测总站吉林长春130021

[Objective] The aim was to provide theoretical basis for the study of underground water dynamic changes in Songnen Plain in Jilin Province.[Method] The dynamic changes and driving factors for the underground water in Songnen Plain in Jilin Province was expounded.[Result] Since 1960s,the temperature in the Songnen Plain in Jilin Province increased *** average temperature increased 2℃;precipitation reduced ***,the trend of precipitation reduction in west area was more distinct;in the meantime,the development of underground water augmented gradually and reached 2 800 million m3 in *** by many factors,regional underground water level had distinct *** water position reduced greatly in northwest fan-shaped *** one in other places were stable and even increased in certain parts;confined water position decreased quickly in general and it increased in certain parts.[Conclusion] The general deterioration trend of underground water environment was ***,the deterioration process can be eased through scientific planning and regional underground water resources so as to realize sustainable utilization of regional underground water resources.

关键词： Songnen Plain Groundwater dynamic drive factor

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