沟灌方式下枣树林地土壤水分的运移特征

Characteristics of Soil Water Transportation of Zizyphts Jujuba Forest by Furrow Irrigation

以盛果期枣树为研究对象,利用EM50土壤温湿度测定仪监测沟灌条件下林地土壤水分的变化,分析60m3/亩、100m3/亩、140m3/亩灌溉量下土壤水分运移规律,确定土壤水分的入渗速率、土壤湿润区间、灌溉周期,为枣树的精准灌溉提供科学依据.结果表明:(1)在60m3/亩、100m3/亩、140m3/亩灌水量下土壤水分下渗的湿润区间分别为-100cm、-120cm和-160cm;水平侧渗的湿润区间分别为80cm、100cm和140cm(.2)灌溉过程中林地土壤水分的平均运移速率为24.78cm/min(.3)土壤水分湿润区间和灌水量和灌溉时间三者间存在的线性函数关系式为Y=-0.115X1+0.119X2+34.645(.4)灌水量每增加40m3/亩,相应的灌水周期将延长4-6d.

In order to know the characteristics of soil water transportation of Zizyphts Jujuba Forest which grow in the full fruit period, rate of the water down permeation, depth of water contained soil, and irrigation cycle were measured by EM50 soil tempcmture and humidity meter monitoring in the conditions of ditch irrigation. The results showed that： （ 1 ） the transverse humid interval in the vertical direction was -100cm, -120cm,and -160cm, and in the horizontal direc- tion was 80cm, 100cm, and 140cm when the quantity of water supply was 60 m^3, 100 m^3, and 140 m^3 per acreage, respectively. （2） During the irrigation, the mean rate of the water down permeation was 24.78 mirdcm. （3） Within the time of irrigation process, the relationship among the depth of water contained soil （Y）, quantity of water supply （XI）, and irrigation time （X2） was indicated as Y=-0.115Xl＋0.119X2＋34.645. （4） When the quantity of water supply increasing 40 m^3 per acreage, the irrigation cycle would increasing 4-6 d, correspondings.