Study On The Growth And Development Of Wild Apricot In Xinyuan Wild Fruit Forest

In this paper,wild apricot in Xinyuan wild fruit forest was used as experimental material.The meteorological factors of wild fruit forest in Xinyuan,phonological period,growth and development of roots,branches and leaves of wild apricot in Xinyuan wild fruit forest were investigated,and the changes of trunk sap flow of wild apricot were monitored.The results are as follows:(1)In Xinyuan wild fruit forest,the annual average temperature is 9℃;the air relative humidity is high;the solar radiation is the strongest in July,and the annual average value range is 51.60 w/m2～249.90 W/m2;the precipitation is mainly concentrated in April June;the change of soil surface temperature and soil moisture content is greater than that of deep soil;the soil temperature is the highest in August,and the soil moisture content is the highest in April June;the southeast wind is the main wind in the wild fruit forest,and the annual average wind speed is 1.44 m/s;the correlation between air temperature and soil temperature is the largest among all environmental factors,which is 0.885.(2)In Xinyuan wild fruit forest,wild apricot entered the stage of flower bud sprouting on March 28,and entered the stage of initial flowering in early April,the flowering period was 9～10 d,the flowering period was 4～5 d,and entered the stage of leaf development in mid April,and the fruit matured in the middle and late July.(3)The total growth of roots and the total number of new roots of wild apricot showed a continuous increasing trend.The rapid growth period of roots was from June 11 to August 30.The root system is the most active in the soil layer of 50～100 cm,and the root system grows alternately in different soil depths.(4)The rapid growth period of new shoots was from May 1 to May 21,the first rapid growth period of fruit was from May 1 to May 16,and the second rapid growth period of fruit was from June 27 to fruit maturity.The rapid growth period of new shoots overlaps with the first rapid growth period of fruit;when the new shoots stop growing,the fruit enters the second rapid growth period,and the root system enters the rapid growth period.The growth and development of wild apricot is influenced by air temperature,soil moisture content and soil temperature.(5)The variation of stem diameter of wild apricot is "slow fast slow".The daily variation of stem diameter has obvious regularity of day and night variation.At about 8:00,the stem diameter reaches the maximum value,and at about 16:00,it reaches the minimum value.It can be divided into three stages:contraction stage,recovery stage and growth stage.Under different weather conditions,the maximum daily shrinkage and growth of stem diameter in sunny days were greater than in cloudy days.Environmental factors have a great influence on stem diameter,among which soil moisture has the greatest influence on stem diameter during the whole monitoring period.(6)The sap flow rate of wild apricot has obvious diurnal variation,and the daily variation of the sap flow rate is high in day and low in night.Under different weather conditions,the sap flow rate of wild apricot is sunny>cloudy>rainy;in July,the sap flow rate of trunk reaches the maximum value,which is 2012.29 L,and the average daily flow rate of the whole growth stage is 46.63 L/d;environmental factors and wild apricot trunk There is a close relationship between the change of sap flow,in which solar radiation has a significant positive correlation with sap flow in the whole growing season,and the correlation coefficient reaches the maximum value in July,which is 0.802,while the air relative humidity has a negative correlation with sap flow.