太行山南麓地区不同林龄栓皮栎林根系生物量及形态特征研究  

Study on root biomass and morphological characteristics of Quercus variabilis Bl. forest of different age in the south foot of Taihang Mountain

作　　者：余洁 胡启立[1] 张志铭[1] 赵勇[1] 赵河[1] 赵琛迪 刘雅辰 YU Jie;HU Qili;ZHANG Zhiming;ZHAO Yong;ZHAO He;ZHAO Chendi;LIU Yachen(College of Forestry,Henan Agricultural University,Zhengzhou 450002,China)

机构地区：[1]河南农业大学林学院,河南郑州450002

出　　处：《河南农业大学学报》2018年第4期533-539,共7页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(31270750);"十二五"国家科技支撑计划项目(2011BAD38 B00)

摘　　要：选择太行山南麓地区典型树种栓皮栎为研究对象,采用土钻法研究树种细根(直径<2 mm)的生物量及其细根性状,如分布和形态特征,并探讨其与土壤含水量的关系。结果表明,(1)不同林龄栓皮栎林下土壤细根生物量分布表现为10 a生>30 a生>40 a生>20 a生,依次降低了1.77、3.01和14.05 g·m-2;在不同龄级水平方向上,土壤细根生物量分布表现为:10~20 cm土层中,10 a生细根生物量显著高于30、40 a生栓皮栎;30、40 a生细根生物量表现为0~10 cm土层显著高于10~20 cm土层。0~10、20~30与30~40 cm土层中,4种林龄细根生物量均无显著差异。在土层垂直结构上,不同龄级细根生物量均表现为随土层深度增加而减少。(2)40 a生栓皮栎林细根根长密度与土壤含水量呈极显著相关(P<0.01)关系,而10、20、30 a生栓皮栎林与土壤含水量呈显著相关(P<0.05)关系,不同林龄栓皮栎林细根根表面积密度与土壤含水量呈极显著相关(P<0.01)关系。(3)不同林龄栓皮栎林下土壤细根比根长分布表现为随树龄增加而降低。随树龄变化比表面积表现为20 a生>40 a生>10 a生>30 a生,根长密度表现为10 a生>30 a生>40 a生>20 a生,根表面积密度表现为40 a生>10 a生>30 a生>20 a生;在土层垂直结构上,4种林龄栓皮栎林下土壤细根根长密度与根表面积密度均随土层深度增加而减少,比根长与比表面积变化差异不显著。A typical species of Quercus variabilis Bl.in the southern foot of Taihang Mountain was selected as the research object.The soil drilling method was used to study the fine roots(diameter<2 mm)biomass and traits such as distribution and morphological characteristics,and the relationship between them and the soil water content was explored.The results showed that 1)the distribution of soil fine root biomass of different forest ages of quercus variabilis was 10 a>,30 a>,40 a>,20 a,decreasing by 1.77,3.01 and 14.05 gom-2 different forest ages of cork oak forest was 10 a>30 a>40 a>20 a,decreasing by 1.77,3.01 and 14.05 g·m-2 successively.At different age level,the distribution of soil fine root biomass was as follows:in soil layers ranging from 10 cm to 20 cm,the biomass of 10 a thin root was significantly higher than that of 40 a cork oak,and was also significantly higher than that of soil layers ranging from 20 cm to 30cm.The biomass of the 30a and 40a rootlets was 0~10 cm and the soil layer was significantly higher than that of 10~20 cm.In the soil layers of 0~10,20~30 and 30~40 cm,there was no significant difference in the biomass of fine roots of 4 species of forest age.In the vertical structure of soil layer,the biomass of fine roots at different age level decreased with the increase of soil depth;2)the long root density of fine roots in 10a and 40 a cork forest was significantly linearly correlated with soil water content(P<0.01),while that of camphor pine forest in 20 a and 30 a was significantly correlated with soil water content(P<0.05).There was a significant positive correlation between the surface area density of fine roots and soil water content at different forest ages(P<0.01);3)The distribution of soil fine root length of different forest ages of quercus variabilis decreased with the increase of tree age.With the change of tree age,the specific surface area was 20 a>40 a>10 a>30 a,the root length density was 10 a>30 a>40 a>20 a and the root surface area density was 40 a>10 a>30 a>20 a.In the vertical

关 键 词：不同林龄 细根性状 形态特征 含水量 生物量 太行山 

分 类 号：S792.189[农业科学—林木遗传育种]