Effects Of Soil Temperature And The Ratio Of Different Substrate On The Growth Of Trees In Alpine Regin

The ecological problems of the Qinghai-Tibet Plateau are increasingly concerned by people,in order to ensure the survival rate of alpine extreme weather Trees in urban and rural areasand promote the growth of trees.In this study,Tianjun County in Qinghai Province as the study area,increased soil temperature using self-controlled thermoelectric tropical soil warming system,the survival and growth of trees were studied by different temperature increasing time,different warming gradient and different cultivated substrate ratio,the results show:1.Warming time:The survival rate of Amygdalus triloba Lind1.,Populus cathayana,Syringao blate Lind1.and Picea crassifoliaincreased at the highest temperature on June 7,the survival rate of the Malus transitoriawas the highest at the beginning of June 14th;On June 7,the growth of Amygdalus triloba Lind1.,Picea crassifoliaand Malus transitoria was the best,June 1 began to increase the temperature on the Syringao blate Lind1.and Populus cathayana growth promotion of the best performance.2.Warming gradient:When the soil temperature 4 ℃ ± 1 ℃,the survival rates of Amygdalus triloba Lind1.,Populus cathayana and Picea crassifolia were higher than those of other treatments,while the survival rate of Malus transitoria and Syringao blateLind1.was higher than that of other treatments at 3 ℃ ± 1 ℃.In promoting the growth of trees,when the temperature of 4 ℃ ± 1 ℃ relative to other treatments on the growth of Populus cathayana,Amygdalus triloba Lind1.and Syringao blate Lind1.for the best treatment,3 ℃ ± 1 ℃ when the treatment is compared with other treatments on the Picea crassifolia and Malus transitoria growth is the most important.3.Substrate ratio:In the forest soil: peat soil: decomposed sheep manure: native1: 1: 1: 2 ratio,Amygdalus triloba Lind1.and Malus transitoria growth rate higher than other treatments,and Syringao blate Lind1.,Picea crassifolia and Populus cathayana in peat soil: perlite: decomposed sheep manure: native 2: 1: 1: 2 ratio of survival rate higher than other treatment.In promoting the growth of trees,peat soil:perlite: decomposed sheep manure: native 2: 1: 1: 2 treatment relative to other treatments on the Populus cathayana and Syringao blateLind1.growth for the best treatment,forest soil: peat soil: decomposed sheep manure: native 1: 1: 1: 2 is processed relative to other treatments on Amygdalus triloba Lind1.,Picea crassifolia and Malus transitoria role in promoting the growth of the best.Consolidate the above results,in the alpine areas of urban and rural afforestation using self-control temperature soil temperature system on June 7 began to increase the soil temperature and soil temperature increase is set to 4 ℃ ± 1 ℃,at the same time using the forest soil: peat soil: decomposed sheep manure: native 1: 1:1: 2 cultivation substrate ratio is to improve the area of urban and rural greening trees and the best way to promote growth.