Pedosphere 10(1): 77--80, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of shading on gas exchange of cotton leaves under conditions of different soil water contents |
| LIU Xian-Zhao, KANG Shao-Zhong and SHAO Min-Gan |
| Institute of Soil and Water Conservation, the Chinese Academy of Sciences and the Ministry of Water Resources, Yangling 712100 (China) |
| ABSTRACT |
| Effect of different shading levels (no-shading, 80% shading, and 40% shading) on photosynthetic and stomatal responses in cotton leaves was investigated under different soil water contents at midday in summer. All cotton leaves exhibited similar basic responses to shading, including decreased net photosynthetic rates, a tendency to decrease in transpiration rates, and increased stomatal conductance and intercellular CO2 concentration. The leaf conductance of 80% shaded and 40% shaded plants increased by 28% and 16.7% compared with no-shaded plants at high water, respectively, but the net photosynthetic rates of 80% shaded and 40% shaded plants declined by 50% and 14.73%, respectively. Results showed that the combined effect of soil moisture and shading on photosynthetic and stomatal responses in cotton leaves was very remarked. |
| Key Words: gas exchange, leaf conductance, shading, transpiration |
| Citation: Liu, X. Z., Kang, S. Z. and Shao, M. G. 2000. Effect of shading on gas exchange of cotton leaves under conditions of different soil water contents. Pedosphere. 10(1): 77-80. |
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