Growth Analytical of Young and Middle-aged Forests of Taiwania cryptomerioides Hayata in Tengchong City
Based on the sample data of Tengchong City's 2021 Forest Conservation Project,the growth status of Tengchong City's Taiwania flousiana Gaussen in all age groups from la to 20a,and the effects of different ground conditions on the growth of diameter at breast height(Dbh)and height of trees in the middle-aged and juvenile forests of Taiwania flousiana Gaussen in Tengchong City are analyzed.The results showed that the average growth of diameter at breast height(Dbh),tree height(TH)and volume of lumber(VL)varied significantly among the age groups,and the average growth of Dbh and TH in the age group 1～15 a showed a gradual increase with age,and then the average growth of Dbh and TH weakened after 16a;the average growth of volume of lumber(VL)in-creased with age;the positive correlation among Dbh,TH and VL was extremely significant in the young and middle forests.The positive correlation between diameter at breast height(DB),tree height and lumber volume in young and medium-sized forests was highly significant,i.e.The larger the diameter at breast height(DBH)and the higher the tree height,the larger the lumber volume;the effects of different site conditions on the average growth of DBH and tree height were as follows:in the age group of l～10 a,the growth of Taiwania fllousiana Gaussen was the most sensitive to the change of the slope position,followed by elevation,and the effect of the slope direc-tion on the average growth of DBH and tree height of Taiwania flousiana Gaussen was limited.
Taiwania flousiana Gaussenspatial distributionstanding conditionsaverage growthTengchong City
万方数据
维普
