岷江上游干旱河谷区人工林根系生物量及分布格局  

Root Biomass and Its Distribution Patterns of Plantations in the Dry River Valleys of the Upper Reaches of Minjiang River

作　　者：岳永杰[1] 余新晓[1] 慕长龙[2] 刘兴良[2] 宿以明[2] 郑绍伟[2] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室(北京林业大学),北京100083 [2]四川省林业科学研究院

出　　处：《东北林业大学学报》2008年第2期16-18,共3页Journal of Northeast Forestry University

基　　金：国家“十一五”科技支撑计划项目(2006BAD03A03)资助

摘　　要：通过对岷江上游干旱河谷区人工林根系生物量的测定,研究了人工林根系生物量积累及其分配,比较分析了不同径级根系比根长、根长密度、根质量密度和根体积比及垂直分布格局。结果表明:①岷江柏Ⅰ、岷江柏Ⅱ、榆树、刺槐和辐射松的根桩、粗根、中根和小根(φ>2mm)的根系生物量总和占单株根系生物量的百分比分别为82.87%、58.99%、76.8%、83.0%和35.79%,细根(φ<2mm)生物量占根系生物量的百分比大小顺序为辐射松>岷江柏Ⅱ>榆树>岷江柏Ⅰ>刺槐。②岷江柏Ⅰ、岷江柏Ⅱ、榆树、刺槐和辐射松单株总根系长度分别为45.87、20.43、9.22、14.08和17.85m,单株总根系干质量分别为39.643、11.867、7.307、6.683、2.900g,相关分析表明根长与根质量具有明显的正相关关系。③干旱河谷区人工林根长密度、根质量密度和根体积比的垂直分布格局一致,根长密度、根质量密度和根体积比与根幅的关系密切。An experiment was conducted to study the root system biomass and its distribution in the dry river valleys of the upper reaches of Minjiang River. Root length, root length density, root weight density, root volume density and their vertical distribution patterns of root system of different diameters were also analyzed. Results show that the percents of the sum of root system biomass of coarse roots, middle roots and fine roots （φ 〉 2 mm） of Cupressus chengiana Ⅰ , Cupressus chengiana Ⅱ, Ulmus pumila, Robinia pseudoacacia and Pinus radiata to single-plant root biomass are 82. 87%, 58.99%, 76.80%, 83.00% and 35.79%, respectively, and the percents of fine root biomass to root system biomass are in the sequence of Pinus radiate, Cupressus chengiana Ⅱ, Ulmus pumila, Cupressus chengiana Ⅰ , Robinia pseudoacia from high to low. Total root system lengths of single-plant of C. chengiana Ⅰ , C. cheagiana Ⅱ, U. pumila , R. pseudoacacia and P. radiata are 45.87, 20.43, 9.22, 14.08 and 17.85 meters, respectively, and dry weights of total root system of single-plant are 39. 643, 11. 867, 7. 307, 6. 683 and 2. 900 g, respectively. Correlation analysis shows a significant positive correlation between root length and root weight. The vertical distribution patterns of root length density, root weight density and root volume density of the plantations are consistent, and root length density, root weight density and root volume density are closely related with root scope.

关 键 词：干旱河谷 生物量 比根长 根长密度 根质量密度 根体积比 

分 类 号：S718.55[农业科学—林学]