河北坝上饲用树种年生长规律及根系类型  

ANNUAL GROWTH RHYTHM AND ROOTTYPES OF SOME FODDER TREES IN BASHANG REGION,HEBEI

作　　者：袁玉欣[1] 裴保华[1] 毛桂花 

机构地区：[1]河北林学院林学系,河北省张北县中心林场

出　　处：《河北林学院学报》1994年第2期117-123,共7页

摘　　要：报告了河北坝上地区青杨、榆树、柽柳、柠条、沙棘等５个优良饲料用树种的发芽期、展叶期和落叶期等物候特征，观测了它们的年生长进程，并提出了合理的收割时间为８月１０～２０日；各树种饲料产量差别很大，其中榆树产量最高。而且，所有树种产量均比天然草场产量高；各个树种在根量、根幅和根系分布深度方面也存在明显的差别，并由此把它们划分为主根发达型、侧根发达型及主侧根均衡发育型３种根型。The phenological dates of sprouting, leaf developing and leaf abscission of five fod- der trees in Bashang region, Hebci were observed. Based on their annual growth rhythm,Au-gust 10～20 was proposed. The 5 tree speeies yielded more as the optimum period for havest-ing fodder than natural meadow, with the Ulmus pumila as the best.The signifieance differ-enees in root biomass,horizontal and vertieal distribution of root system were found amongthe 5 tree speeies ,and could be divided into three types:tap root type,lateral root type,andeven-developed root type.

关 键 词：饲料林 根系类型 河北坝上地区 

分 类 号：S727.903[农业科学—林木遗传育种]