摘 要：
以"红早酥梨"当年栽植幼树为试材,设土壤质地(A)、覆草种类(B)、覆草量3因素3水平正交实验,在砂地新建梨园进行了幼树树盘覆草保水试验,以期为干旱区砂地果园建植节水培肥措施的应用提供参考。结果表明:树盘覆草对保持幼树距树干50cm范围0~60cm土层土壤水分有积极保水作用;树盘覆盖苦豆子、紫花苜蓿、混合杂草,单株覆盖2.5、5.0、7.5kg鲜草,根际土壤含水量相近,处理间无显著差异;在2012年8月11日灌水后的第16天,受树盘覆草作用的影响,根际土壤0~60cm含水量为6.23%,幼树生长正常,可继续延长灌水间隔期;在灌水后的第70天,树盘覆草处理3个土层土壤含水量20~40cm>40~60cm>0~20cm,幼树根际土壤水分的这种分布格局有利于幼树根系对水分的需求;生产中,砂地梨园幼树树盘覆盖5.0kg左右苦豆子或混合杂草,具有保持幼树根际土壤水分的效果。
译 名：
Effect of Covering Grass Around Young Pear Tree on Rhizosphere Soil Water Content in Sandy Pear Sapling
作 者：
WANG Wen;GE Hong-yuan;ZHEN Wei-ling;ZHAI Yu-xing;Sidalong Forest Farm of Zhangye;Zhangye Academy of Forestry;
关键词：
sand;;pear;;covering grass around tree;;soil water content
摘 要：
Taking ‘Hongzaosu'pear early planting young tree as test material,with soil texture、covering grass species and covering grass quantity as index,a three factor and three level orthogonal experiment was designed to study the water retention treatments covering with grass around young pear tree in sand orchard with young‘zaosu'pear,which provided some useful information for planting,water saving and fertilizing measures in sand orchard.The results showed that,covering grass around tree had a positive role to hold moisture of 0-60 cm soil to 50 cm region around the trunk.the rhizosphere soil water content was closed and had not significant difference,which covered sophora alopecuroides,medicago sativa and mixed grass with 2.5,5.0,7.5kg of single plant around tree.The 16 th day after irrigation on August11,2012,soil water content was 6.23%in 0-60 cm soil,young pear tress to grow well,may continue to extend the irrigation interval,which is influence by covering grass around tree;the soil water content was 20-40cm>40-60cm>0-20 cm of 3soil after irrigation the 70 th day,this distribution pattern in favour of young trees root demand for water;on production,covering sophora alopecuroides and mixed grass with 5.0kg around tree would have the effect of retain rhizosphere moisture of young pear tree in sandy soil.
