摘要
本文报导了不同耕作方法对土壤耕层水分时空分布的影响。在实验研究中,采用TDR导线测定仪监测非搅动土壤中水分的变化,并引进土壤干燥系数和雨后水分收入的概念加以讨论。在玉米整个生育期内,通过对9000个数据的分析,发现传统耕法的土壤平均含水量<一年免耕的含水量<长期免耕的含水量,又以春季最为明显。在干燥过程中,根际土壤的含水量<远根区的含水量,在湿润过程中则相反。用传统方法耕作的土壤,干燥系数高于其他耕法,根际土壤的干燥系数高于其他空间位置。各处理耕层土壤的雨后水分收入状况不同,同一耕法不同空间位置的土壤水分收入也存在差异,耕层水分的空间和时间分布状况明显受耕作处理的影响,同时与地表覆盖和作物发育阶段有关。
Effect of tillage on the spatial and temporal distribution of soil water in the tilled layer is reported in this paper. The non-distructiye soil water was measured with Time Domain Reflectrometer(TDR) cable tester. The soil drying rate and soil water recharge are introduced and discussed in the paper.The everage soil water content for the traditional tillage< that for one year no-tillage<that for long-term no-tillage was found, especially in the spring drying period. During the drying process,the soil water content in the root zone<that in the far root zone,however for be recharging process, in contrast to drying. The soil drying rate,45 oftraditional tillage is highest comparing to others. The soil recharg isdifferent for three trea tments and for different position withintreatment, The tillage treatment affected the temporal and spatial distribution of soil water content significantly, and related to the surface residue and crop development stage.
出处
《黑龙江八一农垦大学学报》
1990年第1期89-100,共12页
journal of heilongjiang bayi agricultural university
关键词
耕作
土壤水分
水分分布
Tillage, Soil water content, TDR cable tester, Soil drying rate, Soil water distribution
