论文部分内容阅读
对1986年6月至1993年6月,7年生的27个桉树树种33个种源的澳大利亚桉树幼林进行了半年及年生长量数据分析。结果表明:桉树幼龄期生长上半年基本停顿,生长期主要集中在下半年。各生长量与时间在幼林期是直线关系、数学模型为Y=A+Bt_0,在一年中(头年9月至次年9月)生长量与时间呈三次抛物线关系,数学模型为Y=A_0+At+Bt~2+ct~3。制约桉树生长量的因子为降雨量和低温。
From June 1986 to June 1993, seven-year-old 33 species of eucalyptus seedlings of 33 species of young Australian eucalyptus trees for six months and annual growth data analysis. The results showed that the growth of young eucalyptus in the first half of the year basically stopped and the growth mainly concentrated in the second half of the year. The growth amount and time are in a straight line in young forest period. The mathematical model is Y = A + Bt_0, and the growth quantity and time are parabola of three times in a year (from the first year to the next September). The mathematical model is Y = A_0 + At + Bt ~ 2 + ct ~ 3. Factors restricting the growth of eucalyptus rainfall and low temperature.