论文部分内容阅读
分别在白桦幼林、中龄林和成熟林的林缘和林内设置样地２０块、样方１６０个，研究边缘效应与增产机制和多样性的关系。结果表明：①边缘效应可使白桦林树高增产１９％～４１％，胸径增产８％～１１％；其中，幼林高效应４．４８，径效应１．０７，中龄林高效应２．８１，径效应－１．１８，成林高效应１．１１，径效应－０．１９。②边缘效应表现显著的树种有红松、白桦、山杨和黑桦。③边缘效应可增加植物多样性１．３～１．６倍。④通过定义容他量和容他面积，说明了白桦林从幼龄到成龄是一个由自稳态经扩大领域态到自解体态的过程；其中处于扩大领域态的白桦中龄林的容乔量为０．２种／ｍ２、容灌量为０．２种／ｍ２、容草量为０．９种／ｍ２、容红量为０．２７株／ｍ２。
20 plots and 160 quadrats were set up in the forest margin and the forest of young birch, middle-aged and mature forests, respectively, to study the relationship between marginal effects and yield-increasing mechanism and diversity. The results showed that: (1) Edge effect could increase tree height of birch forest by 19% ~ 41% and increase DBH by 8% ~ 11%. Among them, young plantation had high efficiency of 4.48, diameter effect of 1.07, Effect -1.18, forest high efficiency should be 1.11, diameter effect -0.19. ② edge effect of significant species of Korean pine, white birch, aspen and black birch. ③ edge effect can increase plant diversity 1.3 to 1.6 times. (4) By defining the volume and area of birch, it shows that the growth of birch from juvenile to adult is a process of self-steady state and self-detachment. The amount of Joe was 0.2 species / m2, the volume of irrigation capacity was 0.2 species / m2, the volume of tolerant grass was 0.9 species / m2, and the amount of red content was 0.27 plants / m2.