摘要
利用TRU系统对南山植物园不同径级的川山茶(Camellia szechuanensis Chien)进行扫描,测定粗度≥1 cm的根系空间分布情况,结果表明,随着地径粗度的不断增加,在距树干0.5 m处粗度≥1 cm的根数呈减少趋势,与地径和冠幅达到极显著负相关;距树干0.5 m和1.0 m圆断面处,供试茶树根数从20个增加至35个,分布范围从12.89~56.19 cm扩大至9.79~59.24 cm。其中78%~85%粗度≥1 cm的根分布在20~72 cm深的土层中,约40%的根分布在20~40 cm深的土层中;以树干为圆点,在半径5 m的90°扇形范围内,随着距树干距离增加,粗度≥1 cm的孤植茶树的根数逐渐增多,却在滴水线附近有所减少。挖开土壤发现,滴水线附近多为细根。虽然滴水线外粗度≥1 cm的根系数量仍不断增加,但很难确定为茶花根系。结合茶树养护实际,建议追肥时将肥料沿树冠滴水线进行沟施。
TRU system was used to scan the roots of different diameter classes of Camellia szechuanensis Chien in Nanshan Botanical Garden at different distances from tree trunks.The results showed that,with the increase of diameter,the number of roots with diame⁃ter≥1 cm gradually decreased at 0.5 m away from the trunk,which was negatively correlated with the diameter and crown width;At the circular section of 0.5 m and 1.0 m,the number of roots increased from 20 to 35,and the distribution range increased from 12.89~56.19 cm to 9.79~59.24 cm.Among them,78%~85%of the roots with diameter≥1 cm distributed in the soil layer of 20~72 cm,and about 40%of the roots were distributed in the soil layer of 20~40 cm;Taking the trunk as the circle point,within the 90°fan-shaped radius of 5 m,with the increase of the distance from the trunk,the number of roots with the diameter≥1 cm increased gradually,but decreased near the drip line.After digging the soil,it was found that there were many fine roots near the drip line.Although the num⁃ber of roots whose diameter is more than 1 cm outside the drip line is still increasing,it is difficult to identify them as Camellia roots.Combined with the practice of Camellia tree maintenance,it is suggested that the fertilizer should be applied in furrow along the drip line.
作者
李玲莉
周利
何永鉥
田中
宋春艳
LI Ling-li;ZHOU Li;HE Yong-shu;TIAN Zhong;SONG Chun-yan(Chongqing Landscape and Gardening Research Institute,Chongqing 401329,China;Chongqing Urban Landscape Engineering Technology Research Center,Chongqing 401329,China;Chongqing Nanshan Botanical Garden Administration Center,Chongqing 400065,China;Chongqing Dazu District Park Management Office,Chongqing 402360,China)
出处
《湖北农业科学》
2022年第1期122-125,共4页
Hubei Agricultural Sciences
基金
重庆市科技计划项目(cstc2011pt-gc80019)
重庆市城市管理科技计划项目“川山茶市街应用栽培管理技术研究”[城管科字2018第(01)号]。
