| Effects of Nitrogen and Phosphorous on the drought resistance of Bupleurum Chinense |
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| DOI：10.7606/j.issn.1000-7601.2005.02.20 |
| Key Words: Bupleurum Chinense nitrogen phosphorous drought resistance |
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| Abstract: |
| A pot experiment was carried out to study nitrogen and phosphorous on the drought resistance of Bupleurum Chinense. The results indicated that under the laboratory-regulated drought, nitrogen fertilization decreased the water-holding capacity of Bupleurum Chinense leaves and the fertilization of nitrogen at a high rate in particular reduced the relative water content of Bupleurum Chinense leaves as well as significantly lowering the stability of their cell membrane and severely inhibiting root growth; nitrogen fertilization could alleviate the reduction of chlorophyll a/b ratio thereby enhancing photosynthesis and proving and was proved to increase the drought-resisting capacity of Bupleurum Chinense. Phosphorous fertilization could increase the stability of Bupleurum Chinese cell membrane, enhance the growth of Bupleurum Chinense roots, and maintain the balance between water uptake and loss of Bupleurum Chinens; it also reduced the stomatal limitation to photosynthesis and thus maintained the photosynthetic capacity under drought; the experiment proved that Phosphorous fertilization be capable of maintaining interior water and metabolic balances of Bupleurum Chinense and thus strengthening the drought-resisting capacity of Bupleurum Chinense. |