液体地膜覆盖对滴灌棉花生长及土壤水温盐环境的影响

Effects of Liquid Film Mulching on the Growth of Drip Irrigated Cotton and Soil Moisture,Temperature and Salts

干旱区棉田残膜污染日益严重,液体地膜覆盖能从根本上杜绝农田残膜增加。为探索液体地膜代替塑料薄膜与滴灌结合的可行性,采用测坑试验研究3种覆盖方式[液体地膜覆盖(LFD)、塑料地膜覆盖(PFD)和裸地对照(NFD)]对滴灌棉花生长及土壤水温盐环境的影响。结果表明,LFD棉花可提高土壤含水率和地温,加快滴灌棉花前期生长速度及适度抑制后期旺长。平均籽棉产量较NFD增长7.2%,相对PFD降低2.1%。LFD棉花对土壤环境无不良影响,在干旱区滴灌棉田具有应用前景。

Considering severe residual plastic film pollution of cotton fields in arid regions,liquid film mulching can effectively eradicate residual film pollution in agricultural fields.To explore the possibility of replacing plastic film with liquid film and coupling the latter with drip irrigation,test-pit experiment was performed to investigate the effects of three mulching modes（i.e.,liquid film mulching,plastic film mulching and bare field）on the growth of drip irrigated cotton and soil moisture,temperature and salts.The results showed that liquid film mulching in drip irrigated cotton field can raise soil moisture and temperature,increase cotton growth rate at early growth stages and prevent overgrowth at later stages.The average seed cotton yield in fields with liquid film mulching increased by 7.2%compared with that in bare fields,and decreased by 2.1% compared with that in fields with plastic film mulching.Liquid film mulching in drip irrigated fields does not exert negative effects on soil environment,and therefore has important research and application prospect for drip irrigated cotton fields in arid regions.