Effect Of Different Mulching Treatment On Soil Physical Properties And Seedling Growth In Liaoning Sandy Coast

In this study,the afforestation land of Pinus tabulaeformis in the sandy coast of Suizhong County,Huludao City,Liaoning Province,based on the analysis of soil physical and chemical properties of Pinus tabulaeformis plantations,the photosynthetic physiological characteristics of nursery stock and the growth status of seedlings,the effects of four kinds of film mulching treatments on the soil physical properties and the growth status of seedlings were studied in this paper.The effects of four different film treatments,such as rain film,black film,white film and control plot,so as to provide the basis for scientific construction and tending management of coastal forest.Research indicates:(1)The three kinds of film types can improve the soil physical properties of Pinus tabulaeformis forest in sandy coast.In the soil 0?20cm,the effect of black film on the improvement of soil physical properties is the best,black film can reduce the soil capillary porosity of 5.99%,increase the soil moisture content of 46.14%,increase the maximum water holding capacity of 2.20%;In the 20?40cm soil layer,it is also the best effect of black film to improve soil physical properties,black film increased soil bulk density 17.33%,increase the capillary water holding capacity of 18.27%,but the Korean rain film capillary porosity decreased the largest,for 23.08%.Thus,as a whole,the black film on soil physical properties of the best results.(2)The effects of three kinds of film types on the soil temperature,soil moisture content and soil electrical conductivity of 10?30cm of Pinus tabulaeformis forest in sandy coast were significant,the effect of black film on soil temperature,soil moisture content and soil conductivity was the best,soil temperature increased by 8.98%,soil water content increased by 9.09%.Three kinds of film types had little effect on soil temperature,soil water content and soil conductivity at 0?10m and 30?50cm.By analysis of variance and multiple comparisons,there was no significant difference in the effect of different mulching treatments on soil temperature,but the effect on soil water content and soil electrical conductivity was significantly different(p<0.05).(3)Three kinds of film types could significantly increase the chlorophyll content of Pinus tabulaeformis during the growing season.Under different film treatment,the chlorophyll content of Pinus tabulaeformis seedlings reached the maximum at noon,among them,the effect of black film on the chlorophyll of Pinus tabulaeformis was the highest,chlorophyll content increased by 63.75%,south korea rain film and white film treatment followed,chlorophyll content increased by 58.24%and 55.56%,respectively.7 to 10 months of chlorophyll monthly changes,the chlorophyll content of Pinus tabulaeformis seedlings was the highest in August,among them,the effect of black film on the chlorophyll of Pinus tabulaeformis was the highest,which was 4.27mg/g,south korea rain film and white film followed by 4.06mg/g and 4.17mg/g,the control minimum,3.54mg/g.Fluorescence characteristics of Pinus tabulaeformis seedlings under different mulching treatments In addition to significant differences in rainflies and white films in August compared with the control,in other months,the difference was not significant.(4)Three kinds of film types could increase the growth of Pinus tabulaeformis seedlings,the growth of ground diameter,the length of shoots,the thickness of new shoots,and can effectively improve the growth of Pinus tabulaeformis root system.Under the white film treatment,the average height of Pinus tabulaeformis seedlings was the highest,south korea rain film and black film followed,respectively,1.92cm and 0.9cm,the control plot was the smallest,0.68 cm.The average monthly growth of Pinus tabulaeformis seedlings under white film treatment was 0.87mm,control and black film followed by 0.65mm and 0.69mm,respectively,south korea rain film minimum,0.65mm.The average shoot length of the seedlings under white film treatment was 3.53 cm,black film and control followed,respectively,2.49cm and 2.18cm,south korea rain film coating the smallest,1.88;The average growth rate of the average shoots of the seedlings was 1.72 mm,south korea rain film and black film followed by 0.78mm and 0.49mm,respectively,white film minimum,0.2mm;The effect of white film on the growth of Pinus tabulaeformis was the best.Seedling root weight,root volume and root length density,are distributed in 10 ?20cm soil layer;under different film treatments,the root system of Pinus tabulaeformis seedlings was within the range of<lmm,the weight proportion of Pinus tabulaeformis seedlings was the highest in the Korean rain film,which was more than 60%;The bulk density of Pinus tabulaeformis seedlings was the largest,which was 82.86%;the maximum proportion of root length of Pinus tabulaeformis was 71.4%.In the root system 1?3mm range,the root weight of Pinus tabulaeformis seedlings was the highest under the black film treatment;11.5 g · cm-3,the root length of Pinus tabulaeformis was 33.61 cm cm-3 under black film treatment.The bulk density of Pinus tabulaeformis was 33.65 10-5· cm-3 under black film treatment.In the root system?3mm range,the root weight density of the film was 55.45 g·cm·cm.The root length density of the black film was 50.15 cm ·cm·3,The bulk density of the black film was about 32 10-5 · cm-3.