| 生物土壤与生态 |
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| Response of Transpiration Characteristics and Water Use Efficiency of Helianthus tuberoses to the Enhancement of Simulated Photosynthetic Radiation and CO2 Enrichment |
| LIN Dong1,2,3, MA Hui-ling1,2, FENG Chao-yang3, LV Shi-hai3 |
| 1.Collage of Prataculture, Gansu Agricultural University, Lanzhou 730070, China; 2.Key Laboratory of grassland Ecosystems, Ministry of Education, Lanzhou 730070, Chian; 3.Institute of Ecology, Chinese Academy of Environmental Sciences, Beijing 100012, China |
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Abstract To determine how transpiration characteristics and water use efficiency of Helianthus tuberoses respond to simulated photosynthetic radiation enhancement and CO2 enrichment, the authors used LI-6400 Portable Photosynthesis System to examine photosynthetic rate (Pn), transpiration rate (Tr), intercellular CO2 concentration (Ci), stomatal conductance (Gs) and vapor pressure deficit based on leaf temp (Vpdl) of Helianthus tuberoses under simulated photosynthetic radiation (SPR) intensities and CO2 concentration. Pn, Tr, Gs and WUE(water use efficiency) increased with enhanced SPR intensity. The increase in Pn, Tr and Gs with each unit SPR added was reduced as SPR intensity increased. At last, these physiological parameters tend to dynamic balance. Whereas, Ci and Vpdl decreased with SPR intensity increase, and Ci reached dynamic balance as SPR intensity exceeded 600 mol\5m-2\5s-1. Pn increased with CO2 concentration between 0 and 800 μmol\5mol-1, and then decreased as CO2 concentration increased from 800 to 2 000 μmol\5mol-1. Ci, Vpdl and WUE of Helianthus tuberoses increase with the increase of CO2 concentration, on the contrary, Gs and Tr decreased. The Light Saturation Point(LSP) measured in leaves was at 1 400 mol CO2\5m-2\5s-1, and the Light Compensation Point(LCP) was at 19 mol CO2\5m-2\5s-1.
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Received: 10 December 2008
Published: 20 January 2010
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Cite this article:
LIN Dong;;MA Hui-ling;FENG Chao-yang;LV Shi-hai. Response of Transpiration Characteristics and Water Use Efficiency of Helianthus tuberoses to the Enhancement of Simulated Photosynthetic Radiation and CO2 Enrichment. JOURNAL OF DESERT RESEARCH, 2010, 30(1): 74-79.
URL:
http://www.desert.ac.cn/EN/ OR http://www.desert.ac.cn/EN/Y2010/V30/I1/74
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