宽窄行栽植模式下三倍体毛白杨吸水根系的空间分布与模拟  

Spatial distribution and simulation for fine roots of triploid Populus tomentosa with wide and narrow row spacing

作　　者：席本野[1] 贾黎明[1] 刘寅[1] 王烨[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《浙江林学院学报》2010年第2期259-265,共7页Journal of Zhejiang Forestry College

基　　金："十一五"国家科技支撑计划项目(2006BAD32B02-02)

摘　　要：研究三倍体毛白杨Populus tomentosa吸水根系空间分布特征是建立三倍体毛白杨根系吸水模型的基础。采用根钻法对宽窄行栽植模式下毛白杨吸水根系的空间分布特征进行了研究。结果表明:垂直方向上,宽、窄行内的吸水根系均在0～60cm递减,但在60～80cm又有小幅度增加;且根系主要分布区域都在0～20cm土层内,根长密度分别达到0.080cm·cm-3和0.074cm·cm-3,约占各自系统总根量的44.14%和48.71%;相同水平方向0～100cm范围内宽行各土层的根长密度较窄行相应土层均有大幅度增加,增加量分别为35.45%,36.76%,71.67%和72.27%。水平方向上,宽行20～200cm内毛白杨根长密度呈指数递减分布;吸水根系主要集中分布在20～80cm内,该区域总根长密度为0.250cm·cm-3,约占系统总根量的49.20%;窄行内吸水根系的水平分布不规律,各土层不同带距间根长密度差异不显著。对窄行拟合了一维根长密度分布函数,决定系数为0.288;对宽行拟合了二维根长密度分布函数,复相关系数达到0.538。研究结果将为进一步探索毛白杨速生丰产林根区的土壤水分动态以及土壤-植物-大气连续体(SPAC)系统中的水分传输机制提供基础资料和理论支持。To form a basis for constructing a root-water-uptake model of triploid Populus tomentosa, spatial distribution characteristics of fine roots were studied through wide （6 m） and narrow （2 m） row spacing planting schemes, and soil coring method using correlation, regression and variance analyses. Results showed that vertically, in both wide and narrow spaced rows, the fine roots were mainly concentrated with- in the 0 - 20 cm soil layer where thdir amount were 0.080cm·cm-3 and 0.074 cm·cm-3 accounting for 44.1% and 48.7% of the total, respectively. For a radial distance of 100 em from the stem, the fine root length density of 0 - 20, 20 - 40, 40 - 60 and 60 - 80 cm soil layer in a wide row increased by 35.45%, 36.76%, 71.67% and 72.27% as compared with that of the corresponding soil layer in a narrow row. Horizontally, in the wide row fine root length density from 20 - 200 cm showed an exponentially declining distribution. The fine roots were mainly concentrated within the 20 - 80 cm soil zone, and within the 0 - 200 em range these roots were 0.250 cm·cm-3 occupying 49.20% of the area. The fine roots in the narrow-spaced row were distributed irregularly with no significant differences among the fine root length densities for different radial distances. In addition, a one-dimensional （R2 = 0.228） root length density function was fitted to narrow spaced rows, while the two-dimensional （R = 0.538） was fitted to the wide row. [Ch, 5 fig. 2 tab. 12 ref. ]

关 键 词：森林培育学 细根 空间分布 三倍体毛白杨 宽窄行 

分 类 号：S792.11[农业科学—林木遗传育种]