| 不同含水量下尖叶拟船叶藓光合速率对光温的响应及其模型 |
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| 引用本文： | 李佑稷,李菁,陈军,黄国文.不同含水量下尖叶拟船叶藓光合速率对光温的响应及其模型[J].应用生态学报,2004,15(3):391-395. |
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| 作者姓名： | 李佑稷 李菁 陈军 黄国文 |
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| 作者单位： | 吉首大学生态研究所,吉首,416000 |
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| 基金项目： | 国家自然科学基金资助项目 ( 3 9970 0 82 ) |
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| 摘 要： | 对不同大气温度、藓体含水量及光照条件下尖叶拟船叶藓光合速率测定研究结果表明，光合速率(Pn)与光照强度(PAR)、大气温度(Ta)及藓体含水量(PWC)之间密切相关，光合速率的光响应曲线为直角双曲线，温度、藓体含水量影响图形的曲度参数，在低含水量、高气温组合和高含水量、低气温组合的藓体高光强下都使光合速率降低．弱光下(PAR<200μmol·s^-1·m^-2)，光合速率最大值Pmax出现在PWC：为50％～80％，但随着Ta的升高而增大，当Ta>25℃，Pmax随Ta升高而降低；随着光照强度的增大，Pmax出现的PWC水平随之提高，当PAR<200μmol·s^-1·m^-2时，光合速率最大值Pmax出现在Ta比较高的范围(20～25℃)，并随PWC的升高而增大，当PWC>80％时，Pmax随PWC升高而降低；随着光照强度的增大，Pmax出现的Ta水平降低、在230
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| 关 键 词： | 尖叶拟船叶藓 气温 含水量 光合速率 光照强度 数学模型 苔藓植物 |
| 文章编号： | 1001-9332(2004)03-0391-05 |
| 修稿时间： | 2003年5月8日 |
Response of Dolichomitriopsis diversiformis photosynthesis rate to light,air temperature and plant water content |
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| LI Youji,LI Jing,CHEN Jun,HUANG Guowen.Response of Dolichomitriopsis diversiformis photosynthesis rate to light,air temperature and plant water content[J].Chinese Journal of Applied Ecology,2004,15(3):391-395. |
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| Authors: | LI Youji LI Jing CHEN Jun HUANG Guowen |
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| Affiliation: | Ecology Institute, Jishou University, Jishou 416000, China. bcclyj@163.com |
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| Abstract: | The net photosynthetic rate (Pn) of Dolichomitriopsis diversiformis(Mitt.) was measured under controlled air temperature (Ta), plant water content (PWC) and irradiance (Photosynthetically Active Radiation, PAR) in laboratory. The results showed that Pn was closely related to PAR, Ta and PWC. The response curve of Pn to PAR was a right angle hyperbola, and the parameters were affected by Ta and PWC. The Pn reduction was great when PWC was low and Ta was high, or when PWC was high and Ta was low. The peak Pn (Pmax) was observed underweak light (PAR < 200 mumol.s-1.m-2) and relatively low (50%-80%) PWC. Under higher Ta, Pmax was higher, but decreased when Ta was higher than 25 degrees C. The PWC range within which Pmax occurred increased in accordance with the increase of PAR. When PAR was lower than 200 mumol.s-1.m-2, the Ta range within which Pmax occurred was relatively high (20-25 degrees C), and Pmax increased with the increase of PWC. When PWC was higher than 80%, Pmax decreased with the increase of PWC. The Ta range within which Pmax occurred decreased in accordance with the increase of PAR. Under moderate light (230 < PAR < 270 mumol.s-1.m-2), the sensitivity of Pn response to Ta and PWC was higher than that under higher or lower light. The Pn response to Ta and PWC was saddle-like, and its parameters were altered according to the variation in PAR. |
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| Keywords: | Dolichomitriopsis diversiformis Air temperature Water content Photosynthetic rate Irradiation Model |
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