不同灌水量对三种园林植物生长的影响

以2a生的臭柏、榆叶梅、山桃为试材,采用盆栽法,将土壤水分梯度分为4个处理等级(即各处理土壤含水量基本保持在田间持水量的15%～25%(T1)、35%～45%(T2)、55%～65%(T3)和不灌水仅靠天然降雨(CK)),分析不同灌水条件对3种园林植物苗木生长的影响。结果表明:3种植物各处理下的生物量均比对照组有所增加,在T3处理时生物量达到最大值,即臭柏为895.28g、山桃为492.01g、榆叶梅为421.86g。各处理条件下臭柏根冠比均无显著性差异;山桃根冠比大小为:CKT1T2T3;榆叶梅根冠比除对照外,随着灌水量的增加而显著减小。3种植物的株高和地径增量随灌水量的增加而增大;并且都在T3处理下增大最为显著。经综合评价,3种园林植物的抗旱能力大小为:臭柏山桃榆叶梅。土壤水分控制在田间最大持水量的55%～65%有利于3种植物的生长,其生物量、地径和株高增加普遍显著好于其它处理,有利于在干旱环境下保持正常生长,为3种园林植物的节水和栽培提供了参考。

Effect of Different Irrigation Amount on the Growth of Three Kinds of Garden Plants

Taking two-year-old plants of Sobina vulgalis,Amygdalus triloba and Prunus davidiana as test materials,a pot experiment was conducted to investigate the effect of different irrigation on three ornamental plants,it including four irrigation treatments: soil water content at field capacity’s 15%~25%(T1),35%~45%(T2),55%~65%(T3) and CK.The results showed that compared to CK,all the plants’ biomass increased and biggest under T3,Sobina vulgalis was 895.28 g,Amygdalus triloba was 492.01 g and Prunus davidiana was 421.86 g.In each treatment,Sobina vulgalis’ root-shoot ratio almost ware the same.For Amygdalus triloba the trend was CK>T1>T2>T3.Prunus davidiana’s decreased as increasing irrigation.All plants’ plant height and ground diameter increased as increase irrigation and significant at T3.In conclution,The drought-resistant ability of three garden plants was as follows:Sobina vulgalis>Amygdalus triloba>Prunus davidiana,Controling the soil water content at 55%~65% of the maximum field capacity was benefit for the three plants’ growth.The good reference for these three ornamental plants’ water saving cultivation were provided.