| 张玉豪,姚素梅,孟丽,邓哲.不同土壤含水率对红豆杉幼苗叶片气体交换和叶绿素荧光特性的影响[J].干旱地区农业研究,2020,38(5):101~106 |
| 不同土壤含水率对红豆杉幼苗叶片气体交换和叶绿素荧光特性的影响 |
| 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 |
| 中文关键词: 红豆杉幼苗 土壤含水率 叶片气体交换 叶绿素荧光特性 生长状况 |
| 英文关键词:Taxus chinensis seedlings soil moisture content leaf gas exchange parameters chlorophyll fluorescence characteristics growth status |
| 基金项目:全国中药资源普查项目（财社\[2017\]183号）；河南省科技攻关计划项目（0624420016） |
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| 中文摘要: |
| 以太行红豆杉幼苗为材料，将土壤含水率阈值分别设置为田间持水率的90%~100%（W1）、80%~90%（W2）、70%~80%（W3）、60%~70%（W4）和50%~60%（W5），定时测量红豆杉幼苗的叶片气体交换参数和叶绿素荧光参数，并于试验后期测量红豆杉幼苗的生长状况。结果表明：红豆杉幼苗叶片叶绿素相对含量、气孔导度、净光合速率和蒸腾速率在W2处理达到最大值，分别比W5增长了10.17%、35.91%、53.03%和85.60%。且W2土壤含水率处理下红豆杉幼苗叶片qP、ETR和Y(Ⅱ)值最高，分别比W5增长了15.38%、30.74%和21.76%。随着土壤含水率的下降，红豆杉幼苗叶片NPQ升高，叶片热耗散能力增强，W5的NPQ值达1.4347，比W1增长了36.78%。W2显著提升了叶片rETRmax和半饱和光强Ik，与W1、W3、W4和W5相比，rETRmax分别增长了24.40%、4.93%、12.60%和26.15%;Ik分别增长了25.06%、7.70%、18.20%和27.08%。不同土壤含水率处理对红豆杉幼苗生长指标影响显著，W2处理的红豆杉幼苗株高、地径和叶面积指数LAI值分别为58.95 cm、7.76 mm和4.01，且显著高于其他处理。因此，在试验阈值范围内，土壤含水率阈值为80%~90%（W2）时有利于红豆杉幼苗光合作用的进行和植株的生长。 |
| 英文摘要: |
| 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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