Effects Of Climatic Variables On Photosynthetic Physiology And Growth Of Larix Gmelinii

In this paper,the growth and photosynthetic characteristics of larch of xingan in the greater xingan mountains of Inner Mongolia were studied by using black shade net and natural sunshine(100%NS)as the control.The growth and photosynthetic characteristics of larch of xingan with height of 0.5m,lm,2m and 3m and four kinds of shade treatments of 65%NS,43%NS and 11%NS were studied.The results show that:The height growth and net photosynthetic rate of larix galifolia of three species of trees,including 0.5m,lm and 2m,were the highest under 65%NS shading treatment,while the height growth and net photosynthetic rate of larix galifolia galifolia of 3m were the highest under natural light control.This indicates that although the larch of xingan is a highly photophilic tree,the seedlings below 2m still need proper shade to grow better.By selecting 50 standard trees in the research area as the research materials,and collecting and sorting the climatic data of the area,the correlation analysis method was adopted to analyze the relationship between the total growth amount of DBH and tree height and various climatic factors.The results show that:The growth of larix oleifolia was influenced by precipitation in spring,followed by winter,and was least affected by autumn,which had nothing to do with precipitation in summer.The growth of larix hinggan in winter was most affected by the maximum temperature,but not the minimum temperature,and was most affected by the average temperature of the other three seasons.The influence of single month temperature on the total growth amount of DBH and tree height was well correlated during the growing season,while the correlation with monthly precipitation was generally not good.