科尔沁沙地主要造林树种细根适应策略  

Fine root adaptive strategy of main afforestation tree species in Horqin sandy land

作　　者：王凯[1] 宋立宁[2] 吕林有 张亮[1] 秦峥媛 

机构地区：[1]辽宁工程技术大学环境科学与工程学院,阜新123000 [2]中国科学院沈阳应用生态研究所,沈阳110016 [3]辽宁省风沙地改良利用研究所,阜新123000

出　　处：《干旱区资源与环境》2014年第12期128-131,共4页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(31025007)资助

摘　　要：为了解科尔沁沙地主要造林树种细根适应机制,以杨树、榆树、油松和不同年龄樟子松细根为对象,研究各树种细根比根长和比表面积的垂直分布特征。结果表明:不同样地树种细根比根长和比表面积在各土层分布规律不同,杨树、榆树、油松和22a生樟子松细根比根长和比表面积表现出两端高、中间低的趋势;而10a和32a生樟子松从表层到底层逐渐增加。杨树和榆树细根比根长和比表面积显著大于樟子松和油松(P<0.05),樟子松随年龄增长,细根比根长逐渐降低,而比表面积(42a生除外)逐渐升高。以上结果说明,杨树和榆树通过增加单位生物量对细根长度和面积的投入适应生境,其资源利用效率高于樟子松和油松;樟子松随着年龄增大,逐渐降低生物量对细根长度的投入、而增加对细根面积的投入来适应生境。To understand fine root adaptive strategy of main afforsetation tree species in Horqin sandy land,the vertical distribution characters of fine root specific root length and specific root surface area of Populus simonii,Ulmus pumila,Pinus tabulaeformis,and different aged Pinus sylvestris var. mongolica were analyzed. The results showed that there were different vertical distribution rules in fine root specific root length and specific root surface area for different forests. The values of P. simonii,U. pumila,P. tabulaeformis,and 22 years old P.sylvestris var. mongolica were high in the both sides and low in the middle of soil layer,but those of 10 and 32 years old P. sylvestris var. mongolica gradually increased from surface to bottom soil layer,The fine root specific root length and specific root surface area were significantly greater in P. simonii and U. pumila than P. sylvestris var. mongolica and P. tabulaeformis（ P 0. 05）. With the increasing of age of P. sylvestris var. mongolica,the fine root specific root length gradually reduced,and the fine root specific root surface area gradually rose except the 42 years old. These results indicated that P. simonii and U. pumila adapt the habitat by increasing the unit biomass investment in the fine root length and surface area,and they had higher resources utilization efficiency than P. sylvestris var. mongolica and P. tabulaeformis. P. sylvestris var. mongolica adapt the habitat by gradually declining the biomass investment in fine root length,while increasing the biomass investment in fine root surface area with the increasing of age.

关 键 词：比根长 比表面积 细根 沙地 

分 类 号：Q948.1[生物学—植物学]