土壤水分在根渗灌条件下的动态变化规律研究  

Study on the Laws of Soil Moisture Dynamic Change under Root-Irrigation

作　　者：王则玉[1,2] 冯耀祖[2] 王治国[2] 周勃[2] 唐亚莉[2] 李寿宁[1] 钟新才[2] 

机构地区：[1]新疆塔里木大学,阿拉尔843300 [2]新疆农业科学院土壤肥料研究所,乌鲁木齐830091

出　　处：《新疆农业大学学报》2010年第3期255-258,共4页Journal of Xinjiang Agricultural University

基　　金：国家"十一五"科技支撑项目(2007BAD38B06)

摘　　要：对根渗灌新型节水灌溉技术水分动态变化进行研究,利用Watch Dog 2800水分测试仪的水分传感器SM100进行监测,材料采用直径25 cm的根渗管。分析灌水过程中和停灌后土壤水分动态变化和规律。通过大田试验,结果表明:在根渗灌条件下,水分是以线源入渗土壤,在渗灌速率为87.86 L/(h.m),灌水时间为100 min时湿润锋径向移动速率远小于垂向移动速率,移动过程呈椭圆形分布扩散。根据不同模型拟合的土壤湿润锋的动态变化,认为二次多项式模型的拟合程度较好。Study on soil water dynamic state was conducted with a new type of water-saving root-irrigation,adopting soil moisture testing instrument Watch Dog 2800 and its transducer SM100 and root-irrigation pipe which has a diameter of 25 centimeters. And the dynamic change and laws of soil water during infiltration period and after Irrigation were analysed. The results of the field irrigation experiment showed that the water permeate soil by a line infiltration under the state of root-irrigation. The speed of wetting front radial movement wasmuch less than that of vertical movement when root-irrigation speed reached 87.86 L/（h· m） and irrigation time was 100 rain and wetting front was distributed by elliptoid shape. Based on the dynamic transformation of soil moisture under different models of root-irrigation. The fitting function of the secondary multinomial model was found to be the most satisfactory. Thus,it provides theo- retical foundation for root-irrigation system.

关 键 词：根渗灌 土壤水分动态 土壤水分再分布 

分 类 号：S275.4[农业科学—农业水土工程]