Effect of pruning measure on physiology character and soil waters of Caragana korshinskii
Effect of pruning measure on physiology character and soil waters of Caragana korshinskii
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DOI：
10.5846/stxb201012041730
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发表时间：
2012
影响因子：
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通讯作者：
杨永胜 Yang Yongsheng;卜崇峰 Bu Chongfeng;高国雄 Gao Guoxiong
中科院分区：
文献类型：
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作者：
杨永胜 Yang Yongsheng;卜崇峰 Bu Chongfeng;高国雄 Gao Guoxiong
锦鸡儿是一种生态适应性很强的灌木，根系发达，能吸收大量水分，能抵抗恶劣的环境条件。锦鸡儿是一种生态适应性很强的灌木，能吸收大量水分，能抵抗恶劣的环境条件。它也是非常有用的饲料和薪材。但6-8年后，随着枝条的枯萎和严重的害虫的攻击，锦鸡儿会退化，降低了它的经济和生态价值。修枝被用来刺激锦鸡儿的更新，取得了良好的效果。然而，随着枝条的枯死，锦鸡儿的枝条迅速生长，从而降低了它的经济和生态价值本研究比较了修剪处理和对照植株的光合作用、蒸腾速率、水分利用效率、枝条水势和土壤水分含量的变化。结果表明，修剪对灌木生长发育的不同阶段生理特性有不同程度的影响。6月开花期，修剪植株的净日光合速率和水分利用效率分别下降了14.72%和33.33%与对照相比，修剪植株的相应日蒸腾速率增加了27.31%。随着生长季节的到来，7-9月，修剪植株的净光合速率逐渐增加，并最终超过对照。同时，两组植物的蒸腾速率差异减小。修剪植株的水分利用效率在整个生长季节内迅速增加，总体提高了222.5%，而对照的水分利用效率仅提高了108.3%。到9月，修剪植株的水分利用效率在整个生长季内迅速增加，总体提高了222.5%，而对照植株的水分利用效率仅提高了108.3%。修剪处理植株的水分利用效率比对照提高了4.76%。第二，在整个生长季，处理植株的分枝水势在每日和每月都高于对照。第三，在整个生长季节，除5月份外，修剪植株的平均土壤水分在50-240 cm深度都高于对照处理，而在0-50 cm深度和240-300 cm深度土壤水分变化较小。修剪与未修剪植株的净光合速率与蒸腾速率之间的相关系数从开花期开始(6月)到生长季(9月)逐渐增大。相关分析表明，修剪对青冈的生理特性有显著的负向影响，而对土壤水分在修剪后的第一个生长季有正向影响。
Caragana korshinskii Kom.sprouts readily when the stems are browsed by animals and is widely distributed in the China Loess Plateau and Hexi Corridor.C.korshinskii is a very ecologically adaptable shrub with an extensive root system capable of adsorbing large amounts of water and resistant to adverse environmental conditions.It is also very useful as forage and fuel wood.However,C.korshinskii degrades after 6—8 years as the branches die back and it is attacked by serious insect pests,decreasing its economic and ecological value.Pruning was used to stimulate regeneration of C.korshinskii,and resulted in desirable effects.Leaves and branches of C.korshinskii grew rapidly after cutting.However,little is known about the interaction between pruning and the rapid growth,and this lack of knowledge inhibits progress in managing planted shrublands.This study compares unpruned(control) to pruned(treatment) C.korshinskii plants to study the effects of pruning on the photosynthetic rate,transpiration rate,water use efficiency,the branch water potential for this kind of plant,and soil moisture content.First,the results show the effects of pruning on the physiological characteristics of C.korshinskii varied at different stages of growth.During the June flowering season,the net diurnal photosynthetic rate and water use efficiency of pruned C.korshinskii declined by 14.72% and 33.33%,respectively,when compared with the control.The corresponding diurnal transpiration rate of pruned plants increased by 27.31% compared with the control.With the onset of the growing season,July to September,the net photosynthetic rates of pruned C.korshinskii gradually increased and finally exceeded the rate of the control.At the same time,the difference between the transpiration rates of the two groups decreased.Water use efficiency of the pruned plants increased quickly during the growing season,by 222.5% overall,while water use efficiency of the control increased by only 108.3%.By September,the water use efficiency of the pruned plants was 4.76% higher than the control.Second,the branch water potential of the treated plants was higher than the control during the entire growing season,both daily and monthly.Third,during the entire growing season except for May,the average soil moisture remained higher for the pruned plants when compared with the control treatment at a depth of 50—240 cm,while the variation of soil moisture was minor at the depths of 0—50 cm and at 240—300 cm.Fourth,the correlation coefficients between net photosynthetic rate and transpiration rate of both the pruned and unpruned plants increased from the beginning of the flowering season(June) through the growing season into September.The correlation analysis shows pruning significantly and negatively affects the physiological properties of C.korshinskii while positively affecting soil moisture during the first growing season after pruning.More research is needed to understand the mechanisms involved in increasing the vegetative re-growth capacity of pruned C.korshinskii.