德宏不同海拔下西南桦生长表现研究

Analysis on Growth Performance of Betula alnoides at Different Altitude in Dehong Prefecture

为研究不同海拔下西南桦生长表现,在德宏州芒市中山乡黄家寨选择有代表性的5个林班,对其胸径、树高、冠幅、材积进行了调查分析。结果表明:在德宏,海拔450~1250 m西南桦的生长量最大,林分生长达到或超过速丰林标准;T5(海拔1450~1800 m)胸径、树高、冠幅、材积量均值均最小,与其他4个测定点均表现为差异极显著(P<0.001),表明海拔高于1450 m的气候条件相对不利于西南桦生长。

In order to study the growth performance of Betula alnoides at different altitudes,five representative stands were selected in Huangjia Village,Midshan Town,Manshi City,Dehong Prefecture,and their DBH,tree height,crown width and volume were investigated and analyzed.The results showed as follows in Dehong Prefecture,the growth amount of Betula alnoides was the largest at 450~1250m altitude,and the stand growth reached or exceeded the standard of fast yield forest.The mean values of DBH,tree height,canopy width and volume at T5(1450~1800m above sea level)were the lowest,with significant differences compared with the other four sites(P<0.001),indicating that climate conditions higher than 1450m were relatively unfavorable to the growth of Betula alnoides.