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| Effect of soil nutrition and water content on theseedling growth and physiological characteristicsof Euryodendron excelsum H. T. Chang |
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| Abstract: |
| With the pots experiments，four soil nutrition levels were designed in the experiment，such as red
soil：humus= 1∶0（ST1），red soil：humus=3∶1（ST2），red soil：humus=1∶1（ST3）and red soil：humus=1∶3
（ST4）. Four soil water levels including control（W1），light water stress（W2），moderate water stress（W3），and
severe water stress（W4）were designed to elucidate the effects of different soil nutrition and water content on seedling
growth and its physiological characteristics of an endangered plant Euryodendron excelsum H. T. Chang. The results
showed that soil nutrition and water content had significant effects on the content of soluble sugar，malondialdehyde，
and proline of seedlings. The photosynthetic pigments contents such as chlorophyll a，chlorophyll b，chlorophyll a+b
and carotenoid decreased with the decrease of the water and nutrition content in the soil. Seedling biomass increased with
the increase of soil nutrition and reached its maximum in ST3，and then decreased in ST4. The leaf water content and
relative water content also significantly decreased with decreasing soil water content. However，the leaf water saturated
deficit and tissue density showed a contrary tendency |
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