雙行凹型壟及覆蓋措施對(duì)黔北煙區(qū)耕層土壤水分的影響
Effects of Bi-row Concave Ridge and Film-mulching on Soil Moisture of Tillage Layer in North Guizhou Tobacco Area
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摘要: 在黔北煙區(qū)平坦黃壤旱地和15°、25°黃壤旱坡地上,，以單行壟地膜覆蓋,、團(tuán)棵揭膜為對(duì)照，研究了雙行凹型壟及其覆蓋技術(shù)對(duì)10 cm和20 cm土層土壤水分的影響,。結(jié)果表明：一般情況下,，淺表層（壟表下10 cm）的含水率高于較深層次（壟表下20 cm），灌溉可以打破這一規(guī)律,；雙行凹型壟較單行壟能促進(jìn)自然降水向壟體內(nèi)補(bǔ)充水分,，增加壟內(nèi)土壤的含水率或降低土壤水勢(shì)；在雙行凹型壟上全生育期覆蓋地膜,，可抑制淺表層土壤水分的無效散失,，保水效果明顯；在雙行凹型壟全生育期覆蓋地膜的基礎(chǔ)上,，遇旱灌溉能提高耕層土壤含水率或降低土壤水勢(shì),，進(jìn)一步優(yōu)化了土壤水分環(huán)境,。Abstract: The experiment was carried 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.
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