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指数施肥下黑木相思根系特征值的动态变化
何茜1, 丁晓纲2, 王冉, 李吉跃3, 张方秋2, 潘文
1.华南农业大学林学院;2.广东省林业科学研究院;3.华南农业大学
摘要:
以黑木相思1年生组培苗为试验材料，研究了不同指数施氮浓度下黑木相思根系特征值（根长、根平均直径、根表面积和根体积）的动态变化。结果表明：经不同浓度氮素处理的黑木相思根系长度、根系表面积、根系平均直径、根体积等形态特征指标均显著高于对照处理(P<0.05)，其中效果最佳的为施N总量400 mg/株的处理，到试验结束时，该处理苗木的根长、根平均直径、根表面积和根体积分别达343.35±20.60 cm、0.41±0.02 cm、26.30±1.32 cm2和0.35±0.03 cm3。施氮总量为600 mg的苗木在试验末期根系各指标生长速率减缓，可能是氮浓度过大使苗木受到一定的“毒害”。
关键词:  指数施肥〓黑木相思〓根系特征
DOI：
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基金项目:广东林业科技创新专项：优质、速生相思无性系选育研究与示范（2009KJCX006）。
Root characteristics dynamic change of Acacia melanoxylon R.Br seedlings under index fertilization
HeQian,dingXiaogang,Wang Ran,Lijiyue,Zhang Fangqiu,PanWen
1.South China Agriculture University;2.Guangdong Academy of Forestry
Abstract:
Nitrogen is one of the most important limiting nutrients during tree growth. One year old Acacia melanoxylon seedlings were selected in the experiment, and root characteristics under treatment of different N concentrations were studied. The results indicated that N supply could significantly increase the root morphology parameters such as root length, root mean diameter, root surface area and root volume (P<0.05). Effect of N total 400 mg for a plant was best to seedlings, by the end of the study, root length, root mean diameter, root surface area and root volume of seedlings were 343.35±20.60 cm, 0.41±0.02 cm, 26.30±1.32 cm2 and 0.35±0.03 cm3, respectively. Root growth treated by total 600 mg N for a seedling slowed down at the end of the experiment, perhaps high N concentration could harm seedling and restrain root growth.
Key words:  index fertilization, Acacia melanoxylon, root characteristics