HUANG Xiu-mei,HAO Li-zhen,WANG Huai-dong,et al.Root Distribution Characteristic of P.cornutum(L.) Gaertn and P.dolabratum Maxim in Mu Us Sandy Land[J].Northern Horticulture,2012,36(08):20-24.
毛乌素沙地沙芥和斧形沙芥根系分布特征
- Title:
- Root Distribution Characteristic of P.cornutum(L.) Gaertn and P.dolabratum Maxim in Mu Us Sandy Land
- 文章编号:
- 1001-0009(2012)08-0020-05
- Keywords:
- Mu Us Sandy Land; Cruciferae; Pugionium gaertn; P.cornutum; P.dolabratum; roots
- 分类号:
- S 647
- 文献标志码:
- A
- 摘要:
- 以毛乌素沙地沙芥和斧形沙芥为试材，采用全挖法，研究了其根系周围土壤含水量变化、根系分布及水平根系空间分布特征。结果表明：在自然生境中，沙芥和斧形沙芥1 a生植株根系周围的平均土壤含水量分别为（2.68±0.11）%、（2.50±0.45）%；2 a生的分别为（3.13±0.46）%、（1.90±0.68）%。沙芥和斧形沙芥主根垂直，水平根系数目较少、但长度极其发达。沙芥和斧形沙芥2 a生主根长均约为120 cm，最长水平根分别为380、400 cm，水平根累计总长分别为1 590、3 340 cm。沙芥和斧形沙芥2 a生水平根系均在深度40～60 cm、距主根0～40 cm的空间范围内分布最多，均在40～60 cm的土层深度分布最大，因此，沙芥和斧形沙芥主要依靠延长水平根系寻找远距离水源来适应低土壤含水量环境，斧形沙芥比沙芥更能适应低土壤含水量。
- Abstract:
- The distribution characteristics and the horizontal roots spatial distribution and the soil moisture around the root system of P.cornutum and P.dolabratum in Mu Us Sandy Land were studied，by using the methods of digging out whole roots.The results showed that round the biennial roots system of P.cornutum and P.dolabratum, the soil moisture were (3.13±0.46)% and (1.90±0.68)% respectively；around the annual roots system，the soil moisture were (2.68±0.11)% and (2.50±0.45)% respectively.The primary roots of P.cornutum and P.dolabratum were all nearly vertical，the horizontal roots system were extremely developed，but number less.The tap-root length of P.cornutum and P.dolabratum of biennial all were 120 cm;the longest horizontal roots were 380 cm and 400 cm respectively；the length of total horizontal roots were 1 590 cm and 3 340 cm respectively；the maximal spacial distribution all were from 20 to 40 cm in the soil depth，from 0 to 40 cm in the radius range.The roots’ adaptive mechanism of P.cornutum and P.dolabratum had strong tap-roots to absorb more water.P.dolabratum had strongger adaptive than P.cornutum to low soil moisture content.
参考文献/References:
[1]王政权,郭大立.根系生态学[J].植物生态学报,2008,32(6):1213-1216.
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备注/Memo
第一作者简介：黄修梅（1971-），女，博士，讲师，现主要从事沙生植物种质资源研究工作。E-mail：Huangxm0404@126.com。