不同水分处理对甘蒙柽柳幼苗根系生长特性的影响  

Effects of different soil moisture contents on root growth characteristics of Tamarix austromongolica seedlings

作　　者：王同顺[1] 孙保平[1] 冯磊[1] 胡生君[1] 于明含[1] 

机构地区：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《生态学杂志》2013年第3期591-596,共6页Chinese Journal of Ecology

基　　金：国家林业公益性行业科研专项(201004018)资助

摘　　要：以1年生甘蒙柽柳幼苗为对象,采用人工壕沟挖掘法,对柽柳幼苗在不同水分处理条件下(干旱处理、适度灌溉、充分灌溉)根系生态学特征的季节变化进行了研究。结果表明,不同水分处理对柽柳幼苗根系生长影响显著,垂直根扎根深度和生长速率随着灌溉量的减小而增加。地面灌溉量的增加会导致根系分布的浅表化和根系消弱系数的减小,根系生物量与土壤深度呈显著负对数关系。不同水分处理条件下,7—10月的根/冠比平均值分别为0.43、0.60、0.90、1.12,其根、冠间存在典型的异速生长关系。根/冠比随土壤水分的减小而增加,且生长季后期大于初期。Taking 1-year-old Tamarix austromongolica seedlings as objects, an experiment was conducted to study the seasonal variation of root characteristics of T. austromongolica seedlings under different water treatments by artificial trench digging method. The water treatments includ- ed dry treatment, moderate irrigation, and sufficient irrigation, respectively. The results showed that water treatments significantly affected the root growth of T. austromongolica seedlings. Depth and growth rate of vertical roots increased with the decreasing of irrigation. Increasing surface ir- rigation led to root distribution in the upper soil layer and gradual decrease of root extinction coef- ficient. Root biomass had a significant negative logarithmic relationship with soil depth. The av- erage values of the root/shoot ratios were 0.43, 0.60, 0.90, and 1.12 from July to October, re- spectively, suggesting an allometric relationship between shoots and roots under different water treatments. Root/shoot ratio increased with decreasing soil moisture content, especially in the later growing season.

关 键 词：柽柳 土壤水分 根系生长 根 冠比 根系消弱系数 异速生长 

分 类 号：S793.5[农业科学—林木遗传育种]