不同坡位对红砂生理指标的影响

Effects of Different Slope Positions on Physiological Indexes of Reaumuria Soongorica

[目的]探索不同坡位对红砂生理指标的影响,为干旱半干旱区红砂的恢复与重建提供理论依据。[方法]以自然条件下生长的红砂为材料,采用野外试验、室内试验及数据分析相结合的方法研究不同坡位对红砂的生理指标的影响。[结果](1)红砂叶片叶绿素(a,b,c)含量均随着坡位的升高而降低。(2)不同坡位,脯氨酸和可溶性糖随坡位的升高有增大趋势,而可溶性蛋白随坡位的升高呈现先减少后增加的趋势。(3)随着坡位的升高,超氧化物歧化酶(SOD)活性呈现先增大后减小的变化趋势,而过氧化氢酶(CAT)活性则呈现的是先减小后增大的变化趋势,过氧化物酶(POD)活性和丙二醛(MDA)含量又呈现出逐渐减小的趋势。(4)随着坡位的升高,硝酸还原酶活性逐渐增加,而游离氨基酸的含量则随着坡位的升高逐渐降低。[结论]随着坡位的变化,红砂主要通过调节叶绿素含量,SOD,CAT和POD的变化来适应环境变化。

[Objective]The objective of this article was to research the effects of standing condition with respect to slope position on some physiological indexes of Reaumuria soongorica,to provide theoretical basis for the restoration and reconstruction of Reaumuria soongorica in arid and semi arid area.[Methods]The study selected Reaumuria soongorica under natural conditions as experimental material,and some physiological indexes of Reaumuria soongorica grew on different slopes were measured by field and laboratory test.[Results]In the upward of slope position,physiological indexes in Reaumuria soongoricaleaves changed as followed：（1） The chlorophyll（a,b,c）contents of Reaumuria soongorica leaves decreased.（2） The proline and soluble sugar contents increased,while soluble protein content firstly decreased then increased.（3） The activity of SOD increased firstly and then decreased;the activity of CAT was on the contrary;and the activity of POD and MDA content showed gradually decreasing trends.（4） Nitrate reductase activity increased gradually with the increase of slope positions;while the content of free amino acids increased gradually.[Conclusion]When growing on different slope positions,Reaumuria soongorica adapt to the habitat change mainly by regulating chlorophyll content,SOD,CAT and POD.