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测定了小兴安岭红松针阔混交林76个样方(20 m×20 m)内127株掘根倒木的形态指标、根系指标和立地条件,分析掘根差异的影响因子以及掘根木外形参数与根部土壤的关系.结果表明:不同树种的掘根数量差异显著,以冷杉受掘根危害最重,红松次之,榆树最轻.阔叶树种的抗掘根性能优于针叶树种.树木对掘根的抗性随胸径和树高的增加先快速降低后逐渐升高,分别在20 cm径级和14 m高度级处达到最低;树木尖削度和树冠投影面积越小,抗掘根性能越好;掘根率与林分密度呈显著负相关.处于湿地、缓坡、中低海拔处或迎风坡的树木掘根风险更大.掘根时受扰动土壤的深度、面积及体积与倒木胸径、树高及材积之间呈显著相关.
The morphological indexes, root system indexes and site conditions of 127 dugouts in 76 plots (20 m × 20 m) of the coniferous and broad-leaved coniferous forest in Xiaoxing’anling were determined. The influencing factors of the dredging differences were analyzed. The results showed that there were significant differences in numbers of digging roots between different tree species, with the hardest hit by fir roots, the second with the pine trees, and the lightest among the elm trees. The resistance decreased rapidly at first and then increased with DBH and tree height increasing, reaching the lowest at 20 cm diameter and 14 m height respectively. The smaller the taper and crown projected area of trees, There was a significant negative correlation between rooting rate and stand density.The trees in the wetland, gentle slope, mid-low altitude or windward slope were more likely to dig their roots.The depth, area and volume of disturbed soil at the time of rooting were compared with those of fallen tree, And the volume was significantly correlated.