Effects of Film Mulching Methods on Substrate Moisture and Thermal Effects and Plant Growth of Potted Tree Peony
Exploring the effects of different film mulching methods on substrate moisture and thermal effects and plant growth of potted tree peony and selecting simple and high-efficiency management method have important significance to popularizing engineering seedlings of pot flower.Film mulching is an important solu-tion for agricultural production with less precipitation and heat shortage,which is helpful to improving the rhi-zosphere micro-ecological environment and crop yield and quality.With no film mulching as control(T0),five film mulching patterns for potted tree peony were set as mulching with white film above the plastic pot(T1),mulching with black film above the plastic pot(T2),mulching with white film above the plastic pot and black film below(T3),mulching with black film both above and below the plastic pot(T4),and mulching with white film both above and below the plastic pot(T5).The moisture and thermal environment change of pot substrate for potted tree peony under different film mulching methods,and their impacts on plant development and photosyn thetic performance were analyzed.The results showed that the daily maximum temperature of the substrate increased by over 5.0℃in winter and spring periods under T1 and T5 treatments compared with T0,and T1 and T5 treatments could save water by 1.065 kg and 1.195 kg per pot in 16 days in spring,respective-ly.The above results indicated that film mulching method could significantly affect moisture and thermal effects and improve the micro-ecological environment of pot substrate.White film mulching above the plastic pot in spring and summer accelerated the leaf color from red to green,and enhanced plant photosynthetic perform-ance and metabolism,so as to facilitate the biomass accumulation of every part of the plants during defoliation period in autumn.The seedling index in autumn under different film mulching methods showed as T1>T5>T3>T2>T4>T0,indicating that mulching with white film was the best for growth and development of potted tree peony.Correlation analysis results showed that there were significantly or extremely significantly positive corre-lations between root development and seedling index.Path analysis results showed that the increase of plant bi-omass and leaf photosynthetic performance was the foundation to obtain strong seedlings of potted tree peony.The cluster analysis results based on growth status of potted tree peony showed that the six treatments could be divided into three categories,among which,T1 and T5 were clustered in one category,and they were the dominant treatments.In summary,only mulching with white film above the plastic pot was recommended for potted tree peony production with the best growth potential,low cost,and in line with the principle of simple and high efficiency cultivation.
Film mulching methodTree peonyPlanting substrateTemperatureMoistureSeedling indexEngineering seedlings
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