摘要
根据对咸阳长武苹果林地和麦地春季土壤含水量的测定，讨论了该地区人工植被春季0～6m土壤含水量的变化特点及对水循环的影响等问题．结果显示，咸阳长武地区中龄苹果林地春季土层剖面的含水量从上向下均呈现由高到低再到高的变化趋势，主要耗水层位是100～310cm，而麦地的土层含水量由上向下呈现逐渐增高的变化趋势，主要耗水层位是0～120cm．春季麦地土层平均含水量较苹果林地通常高3％～4％，但第1层较苹果林地低，第2和第3层较苹果林地高，尤其是第3层含水量更高．研究表明，该地区春季麦地尚无干层发育，苹果林地130～310cm土层已零星分布有厚度较薄发育较弱的干层，如果年降水持续不足600mm，该地区将发育较为广泛的土壤干层．苹果林地土壤干层的出现部分地切断了大气降水向深层的入渗，使大气降水不能正常补给地下水，从而影响该区水分的正常循环．为保持苹果林基本正常的生长和土壤水的正常运移，应避免严重的土壤干层出现，严格控制种植密度．
According to soil moisture content determination of apple torest land and wheat field at Changwu County in Xianyang in spring, the change of 0--6 m soil moisture content and its influence on water cycling were studied in this paper. The result shows that the soil moisture content in 6m soil profile under apple forest land is high in the upper layer and becomes low in the middle and then becomes high in the lower layer. The main moisture-consumed layer is 100- 310 cm. The soll moisture content in 6 m soil profile under wheat field is low in the upper layer and increases in the middle and lower layer. The main moisture-consumed layer is 0- 120 cm. The mean soil moisture content under wheat field is 3 % --4 % higher than that under apple forest land generally. The middle and lower layer is higher while the upper layer is lower. The research result indicates that, dried soil layer hasn＇t developed in wheat field in spring, while in 130--310 cm earth layer under apple forest land distributes thin dried soil layer developed faintly. If the annual rainfall shouldn＇t reach 600 mm continually, dried soil layer would develop widely. The development of dried soil layer under apple forest land cuts off rainfall＇s infiltration through deep-layer partially and rainfall can＇t replenish groundwater normally, which affects normal water cycling in this region. In order to keep the growth of apple forest and the transfer of soil moister normally, severe dried soil layer should be avoided and planting density should be controlled strictly.
出处
《陕西师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第2期97-101,共5页
Journal of Shaanxi Normal University：Natural Science Edition
基金
国家自然科学基金资助项目(40672108)
关键词
咸阳长武
人工植被
土壤含水量
水循环
Changwu of Xianyang
artificial vegetation
soil moisture content
water cycle
