关键词: 土壤水热;生菜产量;微喷灌;不覆膜滴灌;覆膜滴灌;

Abstract: Micro-sprinkler irrigation, drip irrigation and drip irrigation under mulch are important irrigation methods to improve the utilization efficiency of irrigation, which can change the microclimate of farmland, affect the soil hydro-thermal condition.To explore the effects of micro-sprinkler irrigation, drip irrigation and drip irrigation under mulch on soil hydro-thermal condition yield of Lactuca sativa,an irrigation experiment of Lactuca sativa was carried out in the field at the Irrigation Experimental Center Station of Yunnan Province in 2020 to 2021.The results showed that compared with micro-sprinkler irrigation, drip irrigation with mulch and drip irrigation increased the average soil water storage in lettuce root layer by 41.6% and 37.5% in 2020,and 33.5% and 29.5% in 2021,respectively.Compared with micro-sprinkler irrigation and drip irrigation, drip irrigation with mulch increased the average soil water storage in lettuce root layer by 9.6% and 12.3% in 2020,and 9.5% and 10.3% in 2021,respectively.The geothermal gradient was the highest under micro-sprinkler irrigation followed by drip irrigation and mulched drip irrigation.Influenced by irrigation methods, the yield of Lactuca sativa under drip irrigation with mulch were significantly higher than those under drip irrigation and micro-sprinkler irrigation.The results can provide scientific basis for the adjustment of irrigation mode in central Yunnan Province.

Key words: soil hydro-thermal condition; Lactuca sativa yield; micro-sprinkling irrigation; drip irrigation; drip irrigation under mulch;