叶片损伤和刈割处理对柠条幼苗补偿生长的影响  

Effects of Leaf Damage and Cutting Treatment on the Compensatory Growth of Caragana korshinskii Seedlings

作　　者：孙毅[1] 闫兴富[1] 周立彪[1] SUN Yi YAN Xing-fu ZHOU Li-biao(College of Biological Science and Engineering, Beifang University of Nationalities/ Key Laboratory of Ecosystem Model and Applications of State Nationalities Affairs Commission, Yinchuan 750021, China)

机构地区：[1]北方民族大学生物科学与工程学院/国家民委生态系统模型及应用重点实验室,宁夏银川750021

出　　处：《中国草地学报》2016年第6期53-59,共7页Chinese Journal of Grassland

基　　金：国家自然科学基金项目"宁夏白芨滩自然保护区天然柠条荒漠灌丛种群更新机制研究"(31260151);北方民族大学校研究生创新研究项目(YCX1529)

摘　　要：以2年生柠条幼苗为材料,研究叶片损伤(剪除1/2叶片和剪除全部叶片,即C_(1/2)和C_1)和刈割(留茬高度分别为30cm、15cm、3cm和对照不刈割,即C_(30)、C_(15)、C_3和C_0)对幼苗补偿生长的影响。结果表明:叶片损伤和刈割的幼苗株高、基径和主根长均极显著小于对照(P<0.01),且随叶片损伤和刈割强度的增大而减小;低强度叶片损伤和刈割促进幼苗侧根数增加,但高强度叶片损伤和刈割处理(C_1和C_3)侧根数极显著减少(P<0.01)。叶片损伤抑制萌条的萌生,萌条数、萌条高和萌条基径均随叶片损伤程度增大而减小;不同强度刈割幼苗的萌生率均高达100%,且萌条数显著大于对照(P<0.05),但萌条高和萌条基径都小于对照。叶片损伤和刈割处理幼苗的总生物量和各器官生物量均显著小于对照(P<0.05),且都随叶片损伤和刈割强度增大而减小,总生物量、根生物量、茎生物量和叶生物量补偿指数都是C_(1/2)或C_(30)最大,C_3最小。The experiment of a series of leaf damages（excision of half of leaflets and all of leaflets,C1/2and C1）and cutting treatment（stubble 30 cm,15cm,3cm,and non-cutting,C30,C15,C3,and C0）was conducted to investigate the effects of leaf damage and cutting on the compensatory growth of twoyear-old Caragana korshinskii seedlings.The results showed that：1）The shoot height,basal stem diameter and taproot length of leaf damaged and cutting C.korshinskii seedlings were all significantly higher than those of control seedlings（P〈0.01）,and all declined with the increasing of intensity of leaf damage and cutting.Low leaf damage and cutting stimulated the increase of lateral root number,while heavy leaf damage and cutting（C1and C3）led to significant reduction of lateral root number（P〈0.01）.2）Sprout number,sprout height and basal stem diameter of sprout all decreased with the intensity of leaf damage increasing.All three cutting treatments resulted in 100% of sprouting rate and the sprout number of clipped seedlings significantly increased（P〈0.05）,but both sprout height and basal stem diameter of sprout were comparatively lower than that of control.3）Total biomass and allocation of leaf damaged and cut C.korshinskii seedlings were all lower than that of control（P〈0.05）and declined when the intensity of leaf damage and cutting increased.Compensation indices of total biomass,root biomass,stem biomass and leaf biomass all maximized in C1/2or C30 and minimized in C3.

关 键 词：柠条 叶片损伤 刈割处理 补偿生长 萌生 

分 类 号：S812.8[农业科学—草业科学] Q948[农业科学—畜牧学]