Studies on the shade-endurance capacity of Glycyrrhiza uralensis
Wei, S-li.; Wang, W-quan.; Chen, X-hua.; Qin, S-ying.; Chen, X-tian.
Zhongguo Zhong Yao Za Zhi 30(2): 100-104
2005
ISSN/ISBN: 1001-5302 PMID: 15714809 Document Number: 594334
Objective:To study the shade-endurance property of Glycyrrhiza uralensis and provide rationale for the practice of intercropping G. uralensis with trees. Method: Black shading nets were used to provide five different environments of light intensities (light penetration rates of 100%, 75%, 65%, 50% and 25%, respectively). To assess the shade-endurance capacity of G. uralensis, several aspects were evaluated, including growth characters, physiological and ecological characters, biomass, and chemical contents. Result and Conclusion: G. uralensis is a fight-favored plant. The growth indices such as plant height, stem diameter, leaves number, root diameter, biomass, and daily average photosynthetic rate (Pn) are highest when light permeation rate is 100%. All these indices decrease when fight intensity decreases. However, G. uralensis possesses shade - endurance capacity to some degree; it adapts to the shading environment by increasing the leaf area and chlorophyll contents. Shading has no obvious effect on the absolute light energy utilization rate (Eu) or Fv/Fm ratio. The influence of shading on the chemical contents of G. uralensis is obvious.