林分密度对水曲柳人工林吸收根生物量和根长密度的影响1﹚.pdfVIP

DOI ：10.13759/ki.dlxb017 网络出版时间：2014-07-21 10:21 第42 卷 第9 期 东 北 林 业 大 学 学 报 Vol.42 No.9 网络出版地址：/kcms/doi/10.13759/ki.dlxb017.html 2014 年9 月 JOURNAL OF NORTHEAST FORESTRY UNIVERSITY Sep . 2014 1﹚ ﹙东北林业大学，哈尔滨，150040 ﹚ ， 1.0 m ×1.0m、1.5 m ×1.5m、2.0 m ×2.0m3 ﹙Fraxinus mandshurica ﹚﹙ 0.5、0.5~ 1.0 、 1.0 ~ 2.0 mm ﹚、﹙ 0.5 mm ﹚ ≤ ≤ 。：，﹙ 2.0 mm ﹚。。， ≤ 。﹙20 ~ 30 cm ﹚ ，。， ，﹙P 0.05 ﹚。 ，，。 ；；；； S725.6 Xie Lingzhi ，Li Junnan ，Wang Shaozhong，Wang Wenna ，Gu Jiacun ﹙Northeast Forestry University，Harbin 150040 ，P . R. China ﹚/ / Journal of Northeast Forestry University.−2014，42 ﹙9 ﹚.−1~5 Weusedsoilcoremethodtodeterminehowstemdensity﹙1.0 m×1.0m，1.5 m×1.5m，and 2.0 m×2.0m﹚affects the fine root biomass and length density of different diameter size classes，in particular of absorptive root ﹙diameter ≤0. 5 mm ﹚，as well as the vertical distribution. The absorptive root biomass per unit area decreased with stem density decrea- sing，and total fine root ﹙diameter ≤2.0 mm ﹚biomass increased with stem density decreasing. The highest length density of absorptive roots in absorptive and total roots both occurred in the intermediate stem density. At per tree level ，root biomass and length density of all diameter size classes increased with stem density decreasing. The proportion of absorptive roots at the deep layer ﹙20−30cm﹚decreased with the length density of absorptive roots increasing. As large variation within each treatment ，stem density had no significant on root traits，however ，root diameter size classes and soil depth both had signif- icant influence on root biomass and lengt