在秦岭山区北坡,对5年生杨树人工林细根表面积、细根体积、根长密度和细根生物量的垂直分布特征,以及这些根系参数与土壤理化特性的关系进行研究。结果表明：杨树人工林细根表面积、细根体积、根长密度和细根生物量基本上表现为随土壤深度增加而减少的趋势；各细根集中分布在0~20 cm土层中，其中0~10 cm土层中占40%左右，10~20 cm中集中了20%以上。土壤理化特性在0~80 cm土层中呈现各自的变化规律，土壤体积质量基本随土层加深而增加，土壤水分表现为变化不大的波动。土壤pH变动范围为6.14~6.71，且随土层加深呈波动变化趋势。土壤有机质、全氮、速效氮垂直变化趋势相似,随土层深度的增加而减少。在杨树人工林中，细根参数与多种土壤理化因子之间存在着不同程度的相关性，说明杨树人工林细根分布特征受土壤理化特性的影响，这反映了植物长期适应生境条件的有效策略。
Abstract
The vertical distribution characteristic of fine root surface area, fine root volume, root lengthy density, and root biomass of 5yearold poplar plantation forest, and their relationship with physicchemical properties of soil in the northern slope of Qinling Mountain were studied. The results indicated that vertical distribution of fine root surface area, fine root volume, root lengthy density and root biomass of poplar forest are with the same trend as all of them decrease with the increase of soil depth. The fine root parameters mostly distributed in the soil layer (0—20 cm), among which about 40% of the fine root parameters distributed in the upper soil layer (0—10 cm), and over 20% of the fine root parameters distributed in the soil layer (10—20 cm). Physicchemical properties of soil showed different changes of their own (0—80 cm). Soil bulk density among different soil layer decreased with soil depth increase. Soil water content showed small fluctuation with soil depth increase. The pH of soil fluctuated between 6.14 and 6.71 with soil depth increase. Content of organic, total nitrogen and available nitrogen of poplar forest among different soil layer decreased with soil depth increase. The different relevant was existed between the fine root parameters and physicchemical factors of soil. The results indicated that the vertical distribution of the fine root of poplar forest was influenced by physicchemical properties of soil, and also reflected the effective strategies of plant of the longterm adaptation to the habitat conditions.
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基金
收稿日期：2008-05-12修回日期：2008-09-14基金项目：日元贷款陕西省植树造林生态环境监测项目(14220302)作者简介：燕辉(1984—)，男，硕士生。*苏印泉(通讯作者)，教授，研究方向为森林培育学。Email: syq009@126.com引文格式：燕辉,苏印泉,朱昱燕,等. 秦岭北坡杨树人工林细根分布与土壤特性的关系[J]. 南京林业大学学报:自然科学版,2009,33(2):85-89.
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