The Effects Of Different Stubble Height On Physiological Ecology Characteristics Of Caragana Korshinskii Kom

In order to explore the effect of different stubble height on the growth characteristics and physiological and ecological characteristics of Caragana korshinskill Kom.,the important significance of the measures of Caragana korshinskill Kom.flat stubble to rejuvenation of the vegetation in the agro pastoral ecotone of Inner Mongolia was revealed.This paper takes the typical Caragana korshinskill Kom.plantation in the Huanghuadianzi watershed of the farming-pastoral ecotone of Inner Mongolia as the research object.The aboveground growth indicators and photosynthetic characteristics of Caragana korshinskii Kom.at 0cm,10cm,20cm and unleveled stubble are studied.A comprehensive analysis of the effects,root morphology indicators,and root stocks was performed.Research indicates:The three types of stubble treatments all changed the above-ground morphological characteristics of Caragana korshinskii Kom.The length and base diameter of the current year's branch of Caragana korshinskii Kom.were significantly increased,and the plant height,crown width,and annual number of branches were significantly reduced and compensation appeared.Growth,and performance as over compensation growth pattern,the compensation index for the three heights of the flattening treatments was 1.43,1.58,and 1.49,respectively,and the above-ground biomass compensation index was 1.10,1.20,and 1.14,and the stubble height was 10 cm,it's above-ground growth indicators were better.The length of fine root length of Caragana korshinskii Kom.in soil profiles with three different stubble heights decreases with increasing distance from standard clumps.The maximum value in the horizontal direction is always below the standard clump;the vertical maximum value appears In the position about 10cm-40cm directly below the standard plexus,the value of the fine root length at 80cm is larger,and the valley at50cm-70cm appears.As the soil depth continues to increase,the root length of Caragana korshinskii Kom.gradually decreases.The overall performance is 10cm stubble>0cm stubble>20cm stubble>unleveled stubbleThe different stubble treatments resulted in a significant increase in the stomatal conductance of Caragana korshinskii Kom.and the decrease of the stomatal limit value,which increased the intake of CO₂ and increased the net photosynthetic rate significantly.The order of the daily net photosynthetic rate of was 8(?molCO₂·m^-2·s^-1)>0cm stubble(?molCO₂·m^-2·s^-1)>20cm stubble 7.25.(?molCO₂·m^-2·s^-1)>5.60(?molCO₂·m^-2·s^-1)of non flat stubble.Compensatory photosynthesis was found.Stomatal opening increased the transpiration rate significantly,and the water use efficiency decreased.Stubble also increased the relative water content of Caragana korshinskii leaves from 56.8%to 70.9%.Hormone levels in Caragana korshinskii Kom.treated with different levels of oysters changed correspondingly.With the removal of above ground tissues,the apical dominance disappeared.The ratio of IAA/CKs of undisturbed.Caragana korshinskii Kom.was 10.51,while the ratios of three different treatments were 10.20,9.79 and 9.81,respectively,which promoted cell division and germination of lateral buds.The synthesis of GAs increased and the?-amylase activity increased from 8.35(mg·maltose DW^-1·5min^-1)at unleveled level to 11.24(mg·maltose DW^-1·5min^-1)at the height of 10 cm.The results showed that the proline content in different parts of Caragana korshinskii Kom.was 10cm stubble<0cm stubble<20cm stubble<unleveled stubble,and the mean value of proline in different parts of the control plants was 2253.59(mg·100g^-1DW)In summary,the suitable stubble height of Caragana korshinskii Kom.should be 10cm.Under this stubble level,larger yields can be obtained,and all growth indicators perform well.