遮光和施氮对暗紫贝母形态特征和生物量分配的影响

Effects of shading and applying nitrogen on morphological characteristics and biomass allocation of Fritillaria unibracteata

根据最优分配理论（optimal partitioning theory,OPT）,在自然环境中,由于地上和地下资源在空间上的分离,陆生植物需要调整其地上和地下部分的生物量分配以平衡对资源的吸收.研究结果显示：在植物地上资源严重受限时,叶片的生物量分配相对增加;而地下资源严重受限时,根的生物量分配相对增加.

Changes in morphological characteristics and biomass allocation of Fritillaria unibracteata P. K. Hsiao et K. C. Hsia under conditions of shading and applying nitrogen were studied. The results show that leaf area, specific leaf area, specific root length,ratio of dry weight of above-ground part to that of under -ground part （ R 1 ） , ratio of dry weight of leaf to that of root （ R2 ） and ratio of dry weight of leaf to that of whole plant （ R4 ） of F. unibracteata under condition of shading have extremely significant differences with those of the control （ P〈0. 01）,but root surface area and ratio of dry weight of root to that of whole plant （ R3 ） have no significant differences with those of the control. Under condition of applying nitrogen,specific leaf area and R4 have extremely significant differences with those of the control, R 1 has significant difference with that of the control （ P 〈 0 . 05） ,but leaf area ,root surface area, specific root length, R2 and R3 have no significant differences with those of the control. Comprehensive analysis result shows that treatments of shading and applying nitrogen have some effects on morphological characteristics and biomass allocation of F. unibracteata,but response of root to shading and applying nitrogen are weaker than those of leaf.