| 贡嘎山东坡亚高山森林系统植被光合作用——双裂蟹甲草（Cacalia davidii）净光合速率对生态因子的响应 |
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| 引用本文： | 杨清伟,程根伟,罗辑,周杨明.贡嘎山东坡亚高山森林系统植被光合作用——双裂蟹甲草（Cacalia davidii）净光合速率对生态因子的响应[J].山地学报,2001,19(2):115-119. |
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| 作者姓名： | 杨清伟 程根伟 罗辑 周杨明 |
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| 作者单位： | 中国科学院、水利部成都山地灾害与环境研究所，四川 成都 610041 |
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| 基金项目： | 国家与中国科学院青藏高原研究项目(KZ951-A1-204)。 |
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| 摘 要： | 以双裂蟹甲草(Cacaliadavidii)为材料，研究其净光合速率对生态因子的响应。结果表明，双裂蟹甲草净光合速率(P
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| 关 键 词： | 贡嘎山 双裂蟹甲草（Caodlia davidill） 净光合速率 生态因子 响应 |
| 文章编号： | 1008-2786（2001）02-0115-05 |
| 修稿时间： | 2000年10月10 |
A Photosynthesis Research
on Vegetation of Subalpine Forest System on the East Slope of the Gongga Mountain |
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| YANG Qing_wei,CHENG Gen_wei,LUO Ji and ZHOU Yang_ming.A Photosynthesis Research
on Vegetation of Subalpine Forest System on the East Slope of the Gongga Mountain[J].Journal of Mountain Research,2001,19(2):115-119. |
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| Authors: | YANG Qing_wei CHENG Gen_wei LUO Ji and ZHOU Yang_ming |
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| Abstract: | With the aid of CI-301PS portable photosynthesis system, a studyon the photosynthetic response of Cacalia davidii to ecological factors in the subalpine forest system on the east slope of Gongga mountain was made. The result showed that daily variation curve of net photosynthetic rate(Pn) of Cacalia davidii was one single peak, not having distinct depression of Pn. The Pn increased quickly with increasing photosynthetic active radiation(PAR),the light compensation point of photosynthesis(LCP) was about 85μmol photons/m2·s-1 but the light sturation point of photosynthesis(LSP) was not measured. The optimum air temperature(Ta) of photosynthesis was 24℃～28℃.The Pn descended with ascending atmospheric relative humidity(RH) and the value of the Pn was high when the RH was 65%～75%. When CO2 concentration in air(Ca) varied from 250μmol/mol ～360μmol/mol,the Pn increased gradually with it. But the Pn varied quickly when Ca was higher than 360μmol/mol or less than 250μmol/mol. The stomatal conductance (C) of Cacalia davidii varied from 50 m mol/ m2·s-1～420m mol/ m2·s-1 and the Pn increased linearly with the C. The stepwise regression showed that the Pn was related signally to PAR and Ca. Based on the experiments, the equations were Pn=-0.1325(PAR)2+3.777PAR-4.3346,R2 = 0.9306;Pn=-0.0359(Ta)2 + 1.7581Ta-7.7164,R2 = 0.7559;Pn=-0.037(RH)2 + 0.2885RH+4.6693,R2=0.8461;Pn=0.0012(Ca)2 -0.616Ca+ 7.657，R2=0.9074； Pn=23.703C-4.1364，R2=0.6127； Pn=2.4102+0.3708PAR+0.2389Ca，R2=0.6152。 |
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| Keywords: | Mt Gongga shan Cacalia davidii net photosynthetic rate ecological factors response |
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