摘要
在黔北烟区平坦黄壤旱地和15°、25°黄壤旱坡地上,以单行垄地膜覆盖、团棵揭膜为对照,研究了双行凹型垄及其覆盖技术对10 cm和20 cm土层土壤水分的影响。结果表明:一般情况下,浅表层(垄表下10 cm)的含水率高于较深层次(垄表下20 cm),灌溉可以打破这一规律;双行凹型垄较单行垄能促进自然降水向垄体内补充水分,增加垄内土壤的含水率或降低土壤水势;在双行凹型垄上全生育期覆盖地膜,可抑制浅表层土壤水分的无效散失,保水效果明显;在双行凹型垄全生育期覆盖地膜的基础上,遇旱灌溉能提高耕层土壤含水率或降低土壤水势,进一步优化了土壤水分环境。
The experiment was carded out both in flat and sloping tobacco fields of north Guizhou Province to study the effects of of bi-row concave ridge and film-mulching on soil moisture at 10 and 20 cm tillage layers. The results showed that the soil moisture content was higher in 10 cm than in 10-20 cm under ridge surface without irrigation. The Bi-row concave ridge increased the soil moisture content and decreased the soil moisture potential in rows, In the whole period of tobacco growth, film mulching on the bi-row concave ridge reduced evapotranspiration from surface soil. These effects were further strengthened with irrigation treatment when drought occurred.
出处
《中国烟草科学》
CSCD
2007年第6期27-32,共6页
Chinese Tobacco Science
基金
贵州省烟草公司科技攻关项目[黔烟科(200503)]
关键词
烟草
双行凹型垄
耕层土壤
水分
tobacco
bi-row concave ridge
tillage soil
moisture
