摘要
采用根钻法研究了3种不同地形条件下兴安落叶松天然林细根现存量的垂直分布特征，并对0～40cm土层的细根（≤2mm）现存生物量和死亡量的垂直分布进行比较。结果表明：平原区细根现存量排序近熟林（13．37t／hm^2）〉中龄林（10．80t／hm^2）〉幼龄林（5．03t／hm^2），丘陵区近熟林（13．71t／hm^2）〉幼龄林（5．69t／hm^2），山地地区近熟林（16．02t／hm^2）〉中龄林（13．23t／hm^2）。细根的现存量主要集中在0～10cm土层中，在各林分中占细根总现存量的比率都超过40％，其中平原区幼龄林细根含量最高，可达到50％根生物量。平原区幼龄林随着土壤深度的增加呈幂函数降低；建立的土层深度与细根生物量模型Y=69．235x^-1.724达到极显著水平（R^2=0．97），丘陵区和山地地区均符合指数曲线函数。
The vertical distribution features of fine root biomass of natural forest of Larix gmelinii under three kinds of different topographic conditions have been studied by use of root core method, and the vertical distribution of standing biomass and mortality amount of fine root （ ≤2 mm） in 0 -40 cm soil layer have been compared. The re- suits show that the order of fine root biomass in plain area is near - mature forest （ 15.37 t/hm^2 ） 〉 middle - aged forest（ 10. 80 t/hm^2 ） 〉 young forest （5.03 t/hm^2 ）, the one in hilly area is near - mature forest （ 13.71 t/hm^2 ） 〉 young forest （5.69 t/hm^2）, the one in mountainous area is near- mature forest （16. 02 t/hm^2） 〉 middle- aged forest （ 13.23 t/hm^2 ）. The fine root biomass mainly concentrates in 0 ～ 10 cm soil layer, the rates of fine root bio- mass in the total fine root biomass in each forest stand are over 40%, which the fine root biomass in plain area is the highest with reaching up to 50%. The fine root biomass of young forest in plain area has decreased in power function with the increase of soil depth. The model of soil depth and fine root biomass is Y = 69. 235x^-1.724, which can catch up to the extremely significant level, the hilly area and the mountainous area accord with exponential curve function.
出处
《内蒙古林业科技》
2015年第2期4-7,共4页
Journal of Inner Mongolia Forestry Science and Technology
基金
中国科学院战略性先导科技专项(XDA05050201-04-02)
国家基金项目(31160106)资助
关键词
兴安落叶松
细根生物量
垂直分布
Larix gmelinii
fine root biomass
vertical distribution
