【摘要】 不同海拔高度对马尾松茎木质部结构的影响张大鹏（福建农业大学，福州３５０００２）ＸｙｌｅｍＳｔｒｕｃｔｕｒｅｏｆＰｉｎｕｓｍａｓｓｏｎｉｏｎｓＳｔｅｍａｔＤｉｆｆｅｒｅｎｔＡｌｔｉｔｕｄｅｓ．￥ＺｈａｎｇＤａｐｅｎｇ（ＦｕｊｉａｎＡｇｒｉｃｕｌｔｕｒａ...更多还原

【Abstract】 omparative anatomic study shows that for the early wood of Pinus massonions,the thickness of secondaryxylem and the number of tracheid layer are decreased gradually with the altitude from 700 to 1100m. At thealtitude of 1300m,they are only respectively 71.21 and 57.70%of the late wood,which is considered to berelated with the lower temperature at this altitude. The ratio of toacheid wall to luace and the percentage ofpit density to ray area increased with altitude,being the maximum at 1300m of altitude,and the pit diamelerand resin passage are decreased with it,being the minimun at that altitude. The decrease of annual forma-tion of axial resin passage and the increase of its density w1th altitude are the results of the reduction offracheid layer number and lumen diameter.更多还原