章古台沙地37年生赤松和樟子松生长特性研究

Growth characteristics of thirty-seven years old Pinus densiflora and Pinus sylvestris var. mongolica in sandy land of Zhanggutai

对章古台沙地37年生赤松和樟子松生长量及生物量进行了调查，并采用解析木法对二者的生长进程进行了对比分析，结果表明：沙地赤松树高和胸径生长量均高于樟子松，分别是樟子松的1．15和1．23倍，并且其生长指标变异系数较小。两树种生物量排序规律是一致的，即：干〉枝〉叶〉果。赤松总生物量较大，是同龄樟子松的1．65倍，其干、枝、果生物量分别是樟子松的1．69、1．96和7．8倍，而叶生物量则略小于樟子松。赤松树高和胸径生长旺盛期在7—21a，而到近40a时，材积连年生长量仍大于平均生长量，说明此时材积生长尚未达到数量成熟。树龄对赤松干形具有显著相关性，随树龄增大胸高形数￡，逐渐增大，并在33年生以上时趋于稳定，说明随树龄增加，赤松干形更加完满。

In sandy land of Zhanggutai, the growth amount and b iomass of 37 years old P/nus sylvestris vat. mongolica and P. denslo ra were detected, and the growth processes of the two species were compared by parse wood method. The result showed that the height and DBH （diameter at breast height） increment of P. deora were higher than that of P. sylvestris var. mongoliea, which was 1.15 times and 1.23 respectively. The biomass rankings of two species were the same, i.e. truck〉branch〉leaf〉cone. Total biomass of P. densiflora was 1.65 times that ofP. sylvestris var. mongolica. The biomass of mack, branch and cone ofP. densO%ra was 1.69 times, 1.96 times and 7.8 times that of P. sylvestri~ var. mongolica, respectively, while the leafbiomass of P. denslora was lower than that of P. syhvar. mongolica. The vigorous growth period of tree height and DBH of P. densiy＇lora was 721 years. For 40 years old P. densora, volume growth in successive years was still higher than the average volume growth, which indicated that stem volume had not reached maturity. The age significantly influenced the stem form ofP. densiflora. With the age increasing, the heightdiameter ratio G increased and became stable after 33 years old.