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《Journal of Glaciology and Geocryology》 2005-05
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Responses of Malondialdehyde and Protecting Enzymes of Desert Vegetation to the Variation of Water Table in Arid District

ZHUANG Li,\ CHEN Ya-ning,\ LI Wei-hong,\ YUAN Su-fen(Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,rümqi Xinjiang 830011,China)  
At different sections of the lower reaches of Tarim River,the MDA contents of the main constructive species of the arbor,bush,herbaceous vegetation-Populus euphratica,Tamarix ramosissima and Apocynum venetumas show an increasing tendency and a positive correlation with the water table along with the constant increase of the groundwater depth and the distance from river.Among them,the Tamarix ramosissima MDA contents of almost every section occupy the first place in the three,which proves that under the condition of moisture coercing at lower reaches of Tarim River,the oxidizing degree of the cell membrane fat of Tamarix ramosissima is relatively high and it is coerced heavy by the aridity;SOD activity of them also rises gradually with the decline of the water table and presents a positive correlation with the water table.However,POD activity keeps dropping with the gradual increase of groundwater depth and presents a negative correlation with the water table.These results indicate that the membrane fats of Populus euphratica,Tamarix ramosissima and Apocynum venetumas have a strong oxidation under the condition of serious water stress,which results in a large amount of MDA accumulation,activates the protection enzyme system in the body of Tamarix ramosissima at the same time and improves its ability of fighting drought through strengthening SOD activity.The reason why POD activity declines may be that arid environment causes POD control system in plant cell obtuseness or protein formatting ability drop,or there are many ways of removing H_(2)O_(2) in plant,the concrete reason awaits to be studied further.The comparison of SOD and POD activity of Populus euphratica,Tamarix ramosissima and Apocynum venetumas under the same water table at the same section in the lower reaches of Tarim River reflects the complement of SOD and POD functions,namely they cooperate with each other while the plant cell defends active oxygen and other peroxide free radicals,which makes plant adapt to the arid environment better.The rational ecological water level and(serious) coercing water level suitable for the plant survival,which are reflected by the MDA content and SOD activity under different water table conditions,are compared and analyzed,and then a preliminary inference is gotten.When the groundwater depth in the lower reaches of Tarim River is over 3.12 meters,the growth of Populus euphratica and Tamarix ramosissima begins to be suppressed promptly,about 6 meters of water table will cause serious coercion to Populus euphratica,and ≥8.83 meters of water table can jeopardize Populus euphratica's existence.And the serious coercing water table and critical water table of Tamarix ramosissima are about 5 meters and ≥8.83 meters,respectively.By contrast,the coercing water table to which Apocynum venetumas can bear is relatively high: more than 3.12 meters water table will cause serious coercion to its growth and lower than 4.42 meters water table will endanger its survival.
【Fund】: 国家重点基础研究发展计划项目(2004CB720201);; 国家自然科学重点基金项目(90102007);; 中国科学院知识创新工程项目(KZCXl-08-03)资助
【CateGory Index】: X173;
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