覆膜种植对高寒区土壤水热、养分和苜蓿越冬的影响

为探究覆膜种植对青藏高原高寒区苜蓿(Medicago)越冬的影响,试验以'甘农1号'杂花苜蓿为材料,在甘肃省武威市天祝高寒地区进行了 3种覆盖模式的苜蓿种植试验,以垄沟(Ridge and furrow,RF)为对照,以垄沟覆膜(Film mulching on ridge and furrow,FM RF)和平作地膜...

Effects of Film-mulching Planting on Soil Water,Temperature,Nutrients and Alfalfa Overwintering in Alpine Area

In order to explore the effect of film mulching planting on the overwintering of Medicago in the alpine region of the Qinghai-Tibet Plateau, ‘Gannong No. 1’ Alfalfa Variety was used as the material, and alfalfa planting experiments with three mulching modes were carried out in Tianzhu Alpine Region of Wuwei City, Gansu Province. Taking ridge and furrow (RF) as a control group, and using film mulching on ridge and furrow (FMRF) and film mulching parallel to the ground (MPG) as the treatment group, the study analyzed the growth of alfalfa, soil water, temperature and nutrient. The results showed that the overwintering rate of alfalfa under FMRF and MPG increased by 25.76% and 23.79% respectively compared with RF, and the overwintering rate of alfalfa under film mulching was more than 88%. Film-mulching greatly increased the soil temperature and water content of the alfalfa field in the alpine region, MPG had the best temperature raising effect and increased the soil temperature by 2.3℃;FMRF increased soil moisture by 6.93% and had the best water preservation effect. As soil water content and temperature conditions improved, the nitrogen content of various forms and soil enzyme activities were also increased. Soil nitrogen and enzyme activities in the 0-30 cm soil layer were as follows:FMRF>MPG>RF. Soil urease activity was significantly positively correlated with ammonium nitrogen, nitrate nitrogen, total nitrogen, and alkali hydrolyzed nitrogen content (P<0.05). In Tianzhu alpine meadow and similar region, film-mulching can significantly increase soil temperature and water content (P<0.05), promote microbial activity, increase soil enzyme activity, and promote soil nitrogen cycle. Thus, it significantly increased the biomass and overwintering rate of alfalfa.