核桃休眠期伤流发生的影响因素(英文)

Factors influencing walnut bleeding during dormancy

为揭示影响休眠期核桃伤流发生因素,以"绿岭"核桃1年生枝条为试材,研究了核桃枝条淀粉酶活性、淀粉含量、可溶性糖含量、枝条的相对电导率及组织结构等与伤流量的关系。结果表明:1年生枝条中的淀粉酶活性与伤流量呈显著正相关或极显著正相关,相关系数为0.729 6～0.901 7;枝条中的淀粉含量与伤流量呈负相关,相关系数为-0.800 54～-0.636 12;枝条中的可溶性糖含量与伤流量呈极显著正相关,相关系数为0.881 42～0.968 55;在-5～5℃之间枝条的抗寒性反应程度影响枝条伤流量的大小;枝条在休眠前期和中期的伤流量与材部面积呈极显著正相关,与导管面积、材部面积/横断面积呈显著正相关,与皮部面积/横断面积呈显著负相关。分析表明伤流总量与树皮面积/横断面积呈显著负相关。淀粉酶活性、可溶性糖含量和导管面积是影响1年生核桃枝条的重要因素。

In order to elucidate the mechanisms responsible for branch bleeding in walnut trees during dormancy,the relationship of sap bleeding and some factors was researched,including amylase activity,starch content,soluble sugar content,relative conductivity,branch structure and so on,taking annual branches of Lvling walnut as material.The results indicated that there was significant or extremely significant positive correlations between amylase activity and bleeding amount,and correlation coefficients ranged from 0.729 6 to 0.901 7.There was a negative correlation between starch content and bleeding amount,and correlation coefficients ranged from-0.800 54 to-0.636 12.There was an extremely significant positive correlation between soluble sugar content and bleeding amount,and correlation coefficients ranged from 0.881 42 to 0.968 55.Branch cold resistance of at-5-5 ℃ also affected bleeding amount.During early and middle dormancy,bleeding amount had an extremely significant positive correlation with xylem area,had significant positive correlations with vessel area and xylem/transverse section area,and had a significant negative correlation with phloem/transverse section area.There was a significant negative correlation between bleeding amount and bark/transverse section area.Amylase activity,soluble sugar content and vessel area were the important factors responsible for sap bleeding in annual walnut branches.