摘要
对固定样地调查,采用伐桩的径、高度、萌芽的数量、萌芽的生长情况等指标,分析东北东部林区主要阔叶树种的伐桩萌芽更新规律。结果表明:在一定的伐桩径范围内,伐桩萌生枝数随着伐桩径的增大而增多;增长到一定程度后随着伐桩径的增大而减少;得出不同树种萌芽能力较强的年龄范围的伐桩径级。对于不同阔叶树种,伐桩高与当年生萌生枝数量的关系存在着不同的变化规律,研究地点具有产生萌芽能力的阔叶树种可划为3种类型:对数型、直线型、指数型,阔叶树的萌生枝高生长与伐桩径和伐桩高无明显关系。第2年伐桩萌生枝的数量与伐桩径的关系在总体趋势上与第1年基本相同,同时次年仍有新的萌生枝产生,但数量很少。与第1年不同之处在于萌生枝开始死亡,一方面,伐桩产生的萌生枝越多,死亡的数量也增大;另一方面,第2年的伐桩存活率在不同种类树种间差别较大:水曲柳高达96·2%,槭树为23·3%,榆树类为21·8%。所探讨的树种在研究区域内都有“萌代主”的能力,并且不同树种以及同一树种不同年龄,“萌代主”的能力和单个伐桩保存的萌生大树的数量不同。
The law of stump sprouting of broad-leaved tree species was studied in eastern forest area in Northeast China by the investigation of fixed sampling. The results revealed that the annual number of stump sprout of tree species was related to the diameter of stump obviously, it increased as the increase of stump diameter, then it decreased as the stump diameter increasing too large. According to the analysis on the relation between the number of stump sprout and the height of stump, the broad-leaved tree species in the study site were divided into three types of stump sprouting： the logarithmic increasing pattern, linear increasing pattern and exponential increasing pattern. The annual height growth of stump sprout was not related to the diameter and height of stump, but it was different in each tree species. Furthermore, the relationship between the number of stump sprout and the stump diameter in the second year was the same as that in the first year, and there were some stumps which could grow a few of new sprouts. The difference between the annual stump sprouting and biennial one was that certain number of sprouts were dead in the second year, and the number of dead sprout increased as the sprout number increasing of each stump. On the other hand, the rate of the stump with living sprouts was different in each tree species, the survival rate of Fraxinus mandshurica was 96.2%, Phellodendron amurense and Juglans mandshulica about 70%, maple（Acer spp. ） 23.3%, and elm（ Ulmus spp.） 21.8%. The investigation of selected-cut forest stand before 1990 proved that some stump sprouts of each tree species mentioned above could develop into big tree instead of the cut and fallen trunk.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2005年第6期72-77,共6页
Scientia Silvae Sinicae
基金
"九五"国家重点科技攻关项目专题(96-004-02-05)
国家自然科学基金项目(30270261)资助。
关键词
东北林区
阔叶树
伐桩
萌芽
动态
northeast forest area
broad-leaved tree
stump
sprout
dynamics
