| Effect of different soil moisture contents on leaf gas exchange and chlorophyll fluorescence characteristics of Taxus chinensis seedlings |
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| DOI：10.7606/j.issn.1000-7601.2020.05.15 |
| Key Words: Taxus chinensis seedlings soil moisture content leaf gas exchange parameters chlorophyll fluorescence characteristics growth status |
| Author Name | Affiliation | | ZHANG Yuhao | School of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | YAO Sumei | School of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | MENG Li | School of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China | | DENG Zhe | School of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang, Henan 453003, China |
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| Abstract: |
| In order to find out the effects of different soil moisture contents on leaf gas exchange and chlorophyll fluorescence characteristics of Taxus chinensis seedlings,this experiment used potting of Tai Hang Taxus chinensis seedlings as test material and set the soil moisture contents at 90%~100% (W1), 80%~90% (W2), 70%~80% (W3), 60%~70% (W4), and 50%~60% (W5) of the field water holding capacity. The gas exchange parameters and chlorophyll fluorescence characteristics of Taxus chinensis seedlings were measured regularly, and the growth of Taxus chinensis seedlings was measured in the later stage of the experiment.The results showed that the chlorophyll relative content, stomatal conductance, net photosynthetic rate, and transpiration rate of Taxus chinensis seedlings leaves reached the maximum with W2 treatment, which increased by 10.17%, 35.91%, 53.03%, and 85.60%, respectively,compared with those of W5. The qP、ETR and Y(Ⅱ) values of leaves of Taxus chinensis seedlings with W2 soil moisture content were the highest, which increased 15.38%,30.74%, and 21.76% compared with W5, respectively.With decreasing soil moisture content, the NPQ of Taxus chinensis seedlings leaves increased, the heat dissipation ability of leaves increased, and the NPQ value of W5 reached 1.4347, which increased 36.78% than that of W1.Compared with W1, W3, W4, and W5,the rETRmax of W2 leaves increased by 24.40%, 4.93%, 12.60%, and 26.15%, and the Ik in the W2 leaves increased by 25.06%, 7.70%, 18.20%, and 27.08%, respectively. Different soil moisture content treatments had significant influence on growth index of Taxus chinensis seedlings, and the plant height, ground diameter, and LAI values of Taxus chinensis seedlings treated with W2 were 58.95 cm, 7.76 mm and 4.01, respectively, which were significantly higher than other treatments.Therefore, in the range of test threshold, the threshold of soil moisture content was W2, which is most suitable for the photosynthesis and plant growth of Taxus chinensis seedlings. |
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