欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

壳聚糖对土壤栽培条件下烟草根系生长的影响

祁帅1,赖勇林1,王军2,王行2,沈宏1*   

  1. 1华南农业大学农学院, 广州 510642; 2广东省烟草南雄科学研究所, 广东南雄 512400)
  • 出版日期:2016-03-10 发布日期:2016-03-10

Effect of chitosan on tobacco root growth under soil cultivation condition.

QI Shuai1, LAI Yong-lin1, WANG Jun2, WANG Hang2, SHEN Hong1*   

  1. (1College of Agriculture, South China Agricultural University, Guangzhou 510642, China; 2Nanxiong Institute of Tobacco Research, Nanxiong 512400, Guangdong, China)
  • Online:2016-03-10 Published:2016-03-10

摘要: 利用土培根箱装置,研究了0、20和40 mg·L-1壳聚糖处理对广东南雄牛肝土、砂泥田土和紫色土中烟草根系生长随时间的变化。结果表明:根箱装置适用于观测3种植烟土壤中的根系动态生长;通过根箱观察面,发现壳聚糖处理显著增加了3种土壤中烟草根系的根长和根数,并且根长与根数的关系呈正相关;其中,在牛肝土和紫色土上,40 mg·L-1壳聚糖处理效果较好,该处理提高了牛肝土上20~30和50~60 cm土层的总根长,以及紫色土上0~10和20~60 cm土层的总根长;而在砂泥田土上,20 mg·L-1壳聚糖处理效果更优,该处理促进了10~40 cm土层根系的伸长;烟草在移栽后第24天,在20和40 mg·L-1壳聚糖处理下,根长伸长率和根数增长率均出现了一个高峰,且显著高于对照处理。研究证明,壳聚糖对土壤栽培烟草根系生长具有促进作用。

关键词: 随机过程, 相关系数, 自回归模型, 水文变异, 相依性

Abstract: The impacts of different concentrations of chitosan (0, 20 and 40 mg·L-1) on root growth dynamics of tobacco seedlings were measured in three soil types (ox liver soil, sand field soil, and purple soil) of Nanxiong, Guangdong Province using rhizobox device. The results showed that the rhizobox device was suitable for the observation of dynamic root growth in the three types of tobaccoplanting soils. By observing root growth on the transparent panes of the growth chamber, it was found that applying chitosan increased the total root length and root number of tobacco plants significantly in the three types of soils, and the total root length was positively correlated to the total root number. In particular, treatment with 40 mg·L-1 chitosan showed better effects, enhancing the total root length in 20-30  and 50-60 cm soil layers of ox liver soil, and in 0-10  and 20-60 cm soil layers of purple soils, while in sand field soil, treatment with 20 mg·L-1 chitosan was the best, increasing the total root length in 10-40 cm soil layer effectively. On day 24 after transplanting, the elongation rate of tobacco roots and the increasing rate of root number showed a growth peak under 20 and 40 mg·L-1 chitosan treatments, being higher than those under the control. The above results indicated that chitosan could promote root growth of tobacco seedlings under soil cultivation conditions.

Key words: correlation coefficient, dependence, hydrological variability, auto-regression model, stochastic process.