不同种源西南桦人工林生长量研究

Study on Growth Volume of Different Provenances of Betula alnoides Plantation

对普文试验林场的25个不同种源西南桦子测林测定胸径、树高、材积等生长性状,利用Excel和DPS数据软件Duncan进行数据分析。结果表明:不同种源西南桦5 a生时胸径、树高和材积存在着显著差异,生长曲线在2 a生时近趋于直线;在4 a生和5 a生时生长曲线呈波形;生长量最大的是种源E(广西田阳),其次是种源K(云南澜沧);4 a生时生长量最小的是种源A(广西凌云),5 a生时生长量最小的是种源J(云南墨江)。

Using Excel and DPS data software Duncan multiple comparisons, the DBH, tree height and volume of 25 provenances of Betula alnoides in Puwen Experimental Farm were analyzed, results showed that： DBH, tree height and growth volume of five years different provenances Betula alnoides had the re- markable difference, the growth curve of two years tended to be linear, growth curve of four years and five years tended to be waveform; Provenance E （Tianyang of Guangxi province） had the largest growth volume, the next is provenance K （ Lancang of Yunnan） ; and in the four years, the smallest is the prov- enance A （Linyun of Guangxi） ; in the five years, the smallest is the provenance J （ Mojiang of Yun- nan）.