畜牧与饲料科学 ›› 2012, Vol. 33 ›› Issue (11): 111-111.doi: 10.12160/j.issn.1672-5190.2012.11.041

• 试验研究 • 上一篇    下一篇

刈割对华北驼绒藜补偿生长的影响

何文彬   

  1. 内蒙古大学,内蒙古呼和浩特010021
  • 出版日期:2012-11-20 发布日期:2012-11-20
  • 通讯作者: 何文彬
  • 作者简介:何文彬(1987-),女,硕士,主要研究方向为草地生态学。

The Impacts of Mowing on Compensatory Growth of Ceratoides arborescens

HE Wen-bin (Inner Mongolia University, Hohhot 010021, China)   

  • Online:2012-11-20 Published:2012-11-20

摘要: 华北驼绒藜广泛分布于我国干旱、半干旱地区,是可用作干旱区人工刈割草地的良好半灌木物种。作为优良牧草.抗旱、耐寒、耐贫瘠,在植被恢复和草地改良中发挥着重要的作用。通过对华北驼绒藜(Ceratoidesarborescens)在不同刈割方式下(即对照、两年刈割1次、两年刈割2次)的生长特性、光合生理以及能量分配等方面的研究。初步探讨刈割对华北驼绒藜补偿生长的影响,揭示其可能的补偿机制,为判别和评价植物的耐牧抗干扰性以及对人工草地的合理利用提供理论依据。该研究结果表明:①随着刈割次数的增加,华北驼绒藜的茎叶比呈增加趋势.刈割促进了华北驼绒藜当年生枝条和根系的生长。与对照相比.刈割增强了华北驼绒藜当年生枝条的生长,使其出现了“数目少、枝条长、茎基粗”等形态变化,根系也随之出现了“根幅大、主根长、侧根多”等变化,在形态上产生了超补偿效应。②刈割增加了华北驼绒藜的净光合速率、蒸腾速率,降低了水分利用效率,出现了光合补偿效应。③刈割降低了华北驼绒藜地上部叶、花的生物量,而增加了当年生枝条的生物量,将叶、花、当年生枝条合并为一个整体来看.随着刈割次数的增加,整体的当年部分地上生物量出现减少趋势。两年刈割1次的地上生物量表现为等补偿,两年刈割2次表现为欠补偿生长。其中。前者较后者提高了生物量的恢复补偿能力,但两者均未达到超补偿的水平。刈割后华北驼绒藜的生物量相对生长率显著增加的同时,根系生物量的分配增加,茎叶生物量分配减少,从而根冠比增加。(④刈割对华北驼绒藜各组分的干重热值没有显著影响,但却改变了华北驼绒藜的能量分配格局.使根系能量分配的投入增加,从而减少了地上部的分配比例。

Abstract: Ceratoides arborescens ,widely growing in China's arid, semi-arid areas, can be used as a good artificial mowing semi-shrub species in arid areas. As a good forage, it has the characteristics of drought, cold and poor land resistance ; it plays an important role in vegetation restoration and grassland improvement. In this paper, we are trying to find the impacts of mowing on the compensatory growth of C. arborescens. We designed three experiments under different mowing frequency:C, arborescens without mowing as the control group;one mowing per two years (treatment 1 ) ;one mowing per year (treatment 2). Then we studied the growth, photosynthetic physiology and energy distribution of those C. arborescens. The results from the experiments show that: (1)With the increase in the mowing frequency of C. arborescens,the ratio of stems and leaves increased,and mowing promotes the growth of shoots and underground roots. Compared with the control group, on one hand, the shoots in the experimental groups with mowing have the morphological characteristics of less, longer and thicker;on the other hand, the roots have wider root ranger, longer main root and more lateral, resulting in morphological overcompensation effect. (2)Mowing increases the net photosynthetic rate of C. arborescens,transpiration rate and stomatal conductance,lowers the water use efficiency; exhibiting photosynthetic compensation effect. (3)Mowing increases the relative growth rate of the C. arborescens and the biomass in the current-year branches. However, the biomass in the aerial parts of leaves and flowers decreases. Considering the leaves, flowers and shoots,the higher the mowing frequency,the lower the biomass in those parts as a whole. From the experiments results,we concluded that:for treatment 1,the biomass in the aerial parts demonstrates equal compensation,while treatment 2 showed less compensation, consequently ,neither of the two treatments reached the level of over compensation. At the same time, mowing increases the distribution of roots' biomass, which means the ratio of biomass in root to shoot increases. (4)Mowing has no significant effect on the total caloric values, but it has significant impacts on the caloric distribution. The existing energy volume trend is consistent with the biomass in C. arborescens, as a result, mowing make more energy distributed in the roots.

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