农田防护林网林地水分状况研究

通过1992~1994年的定位观测,对农田防护林网中的护田林、护渠林林地含水量和林木生长进行了研究。结果表明,3年平均耗水量:护田林是154.40 mm,护渠林内侧2995.92 mm,护渠林外侧1514.75 mm。护田林带的土壤含水量在0~150 cm层内变化,以下为稳定层,而护渠林深层渗漏严重,可穿透3 m土层。胸径和材积生长量是护渠林内侧>护渠林外侧>护田林,但护田林若遇丰水年份,则胸径和材积猛增。农田防护林网的布置格局,应大力发展护渠林。护田林带应采用3行窄带式沟植,成林后可不再灌溉,但切忌农田休闲时,中断维持林木生长的侧渗水。

STUDIES ON MOISTURE CONTENT IN WOODLAND OF A FARM PREVENTING FOREST NETWORK

The relation of soil moisture and plant's growth in farm preventing forest network has been studied,based on the fixed position data observed in 1992~1994.The results are as follows:① The average water consumption of farm shelterbelt,inner side and outer side canal shelterbelt in three years are 154.40,2 995.92 and 1 514.75 mm individually.② The soil moisture content changes between 0~150 cm below the ground in farm shelterbelt land and 0~-3 m or more in canal shelterbelt land.③ The farmland shelterbelt should be constructed by narrow belt with three lines,and the water source after the plant growing up may be applied by side-seeped water from farmland.As for the establishment of compound forest network,the canal shelterbelt should be developped with great effort.