设施条件下株距对膜孔灌土壤温度日变化影响

Impact from row spacing on daily temperature change of membrane-hole irrigated soil under facilities condition

为研究设施条件下株距对膜孔灌土壤温度日变化影响,测定了不同株距下膜孔灌的番茄在全天24 h的不同土层深度的土壤温度。研究表明:(1)不同株距下,膜孔灌各土层土壤温度先升高后降低。(2)不同土层深度下,在观测时段土壤温度先升高后降低,且土层越深,土壤温度变化幅度越小。(3)同一土层深度下,同一时刻,株距越大,土壤温度越高。(4)在各观测典型时刻,株距越大,土壤剖面温度越高,不同株距下的温差在20 cm深度处较小。以上研究结果可为膜孔灌水热调控提供理论依据。

In order to study the impact from row spacing on the daily temperature change of membrane-hole irrigated soil under facilities condition, the soil temperatures at different depths within a whale day （24 hours） are measured for the membrane-hole irrigated tomato with various raw spacings. The study result shows that （ 1 ） the temperatures of all the membrane-hole irrigated soil layers present a trend of rise-fall under the condition of various raw spacings ; （2） the soil temperature within the observation period of time rises first and then falls afterwards, and that the deeper the depth of the soil is, the less the temperature changing amplitude will be at various depths of the soil ; （3） the larger the raw spacing is, the higher the soil temperature will be at the same depth of soil and in the same moment; （4）the larger the raw spacing is, the higher the temperature of soil profile will be and the temperature difference at the depth of 20 cm is less for various raw spacings within every typical observation moments. The study result can lay a theoretical basis for the water temperature regulation of the membrane-hole irrigation.