摘要
【目的】探究滴灌施肥对杨树生长的影响。【方法】以6a生欧美107杨为研究对象,测定了杨树的年生长量,并采用根钻法在株间方向距树干100cm处取样,取样深度为40cm,测定细根特性指标。【结果】滴灌施肥条件下,不同施肥处理下的蓄积增量均显著高于T0处理,T6处理的蓄积增量最大,林分蓄积的年增量随施肥量的增加表现出先增加后减小的特征。0~40 cm不同土层细根生物量和细根长的最大值均在T6处理或T7处理,T0—T7各处理下的细根生物量和细根长的最大值均在0~10 cm土层,然后随土层的加深而减小。细根的比根长随施肥量增加而减小,在垂直方向表现出先减小后增大的分布特征,0~10cm土层比根长最大。胸径年增量与细根特性相关性显著,与0~40cm细根总生物量(r=0.814)、根长(r=0.808)和比根长(r=-0.820)的相关性最大。【结论】滴灌施肥对杨树人工林生长影响显著,6 a生杨树人工林的最佳滴灌施肥量为N 252 g/株,P 42 g/株,K 126 g/株。杨树年生长量与细根具有显著相关性,滴灌施肥可以促进细根的生长和积累但没有改变细根随土层加深而减少的垂直分布特征。
【Objective】We aimed to explore the effect of poplar growth under drip fertilization on.【Method】Six-year-old’107’poplar clones(Populus×euramericana cv.’74/76’)were stuclied.We determined the annual growth of poplar trees,and we got samples from strains direction at the horizontal distances of 100 cm from the stem.The sampling depth was 40 cm and the characteristics of fine root were measured.【Result】Under drip fertilization,the accumulation increment of T1—T7 treatments was significantly higher than that of T0 and T6 treatment was the largest.The accumulation increment increased first and then decreased.The maximum values of fine root biomass and fine root length in different soil layers of 0~40 cm were under T6 or T7 treatment.And the maximum values of fine root biomass and fine root length under T0—T7 treatments were in 0~10 cm soil layer,then it decreased with the soil depth.The specific root length of fine roots decreased with the increase of fertilizer application,and in the vertical direction,the distribution characteristics were decreased firstly and then increased.The correlation between annual increment of DBH and fine root characteristics was significant,the maximum correlations were with the total biomass,root length and specific root length of 0~40 cm soil layers.【Conclusion】The effect of drip fertilization on the growth of poplar plantation is significant,the optimal fertilization of six-year-old poplar plantation under drip irrigation is N 252 g,P 42 g and K 126 g per plant.The annual growth of poplar is significantly correlated with fine roots.Drip fertilization can promote the growth and accumulation of fine roots but can’t change the vertical distribution characteristics of fine roots which is decreased with the deepening of soil layer.
作者
秘洪雷
兰再平
彭晶晶
马鑫
BI Honglei;LAN Zaiping;PENG Jingjing;MA Xin(Tianjin TEDA Saline Green Research Center Co.,Ltd.,Tianjin 300457,China;Chinese Academy of Forestry,Beijing 100091,China)
出处
《灌溉排水学报》
CSCD
北大核心
2021年第S01期77-82,共6页
Journal of Irrigation and Drainage
基金
国家重点研发计划项目(2016YFD0600401)
关键词
滴灌施肥
杨树
生长
细根
drip fertilization
poplar
growth
fine root
作者简介
秘洪雷(1990-),男。硕士研究生,主要从事植物抗逆生理研究。E-mail:bihonglei1990@126.com;通信作者:兰再平(1960-),男。研究员,研究生导师,主要从事森林培育与森林生态学研究。E-mail:wboffice@caf.ac.cn。
