| 王海珍,陈加利,韩路.胡杨和灰胡杨叶绿素荧光特性对地下水位的生态响应[J].干旱地区农业研究,2013,31(3):166~172 |
| 胡杨和灰胡杨叶绿素荧光特性对地下水位的生态响应 |
| Ecological responses of chlorophyll fluorescence characteristics of Populus euphratica and Populus pruinosa to groundwater level in upper reaches of Tarim River |
| |
| DOI：10.7606/j.issn.1000-7601.2013.03.27 |
| 中文关键词: 胡杨 灰胡杨 叶绿素荧光参数 地下水位 生态响应 |
| 英文关键词:Populus euphratica Poulus pruinosa chlorophyll fluorescence parameters groundwater level ecological adaptation mechanism |
| 基金项目:国家自然科学基金项目(30960033,31260058)；“973”前期研究专项(2012CB426507) |
|
| 摘要点击次数: 214 |
| 全文下载次数: 121 |
| 中文摘要: |
| 选取塔里木河上游不同地下水位的样地作为研究点,利用便携式调制叶绿素荧光仪测定了不同地下水位下胡杨、灰胡杨的叶绿素荧光特性和PSⅡ光合活性.结果表明:随地下水位下降,胡杨、灰胡杨表观光合电子传递速率(ETR)、实际光化学量子效率(ΦPSⅡ)、光化学猝灭系数(qP)、光化学速率(PCR)、最大荧光(Fm)和PSⅡ潜在光合活性等参数普遍降低；而非光化学猝灭系数(NPQ)、调节性能量耗散量子产量(YNPQ)、非调节性能量耗散量子产量(YNO)、叶片光合功能相对限制值(PED)和光系统间激发能分配不平衡偏离系数(β/α-1)显著升高,但其最大光化学量子产量(Fv/Fm)总体处于相对适宜状态(＞0.815)。表明两树种PSⅡ光合活性随地下水位下降而降低,光能捕获效率与光化学反应能量下降,耐受强光能力减弱,获取过剩光能程度和PSⅡ受损风险增加。但两树种可通过良好的抗逆性和自我调节机制,增强热耗散来缓解光能过剩带来的损伤,从而使PSⅡ未发生不可逆损伤,保持其较高的光合效率。比较不同地下水位下胡杨和灰胡杨的叶绿素荧光参数发现,胡杨PSⅡ反应中心活性与光化学效率较高、耐旱性较强,表明胡杨对荒漠干旱环境的适应性强于灰胡杨。 |
| 英文摘要: |
| In attempt to explore the correlation between Chlorophyll fluorescence characteristics of Populus euphratica
and Populus pruinosa to groundwater level, Chlorophyll fluorescence characteristics and PS Ⅱ photosynthetic activities of Populus euphratica and Poulus pruinosa
under different groundwater depths in the upper reaches of Tarim River were measured with a portable fluorometer. The results showed that photosynthetic electron transportation rate(ETR), actual photoehemical effieiency of PSⅡ in the light(ΦPSⅡ),photochemistry quenching(qP), photochemieal rate(PCR), maxi-
mal fluorescence(Fm)and potential photosynthetic activity(Fv/Fo)of two tree species were decreased, while non-pho-tochemistry quenching(NPQ), yield for dissipation by down-regulation(YNPQ), yield of other non-photochemical losses(YNO), relative limitation of photosynthesis(PED), and deviation from full balance between PS I and PSⅡ(β/α-1) were increased remarkably with decreasing groundwater level. Their
maximal photochemical efficiencies of PSⅡ(Fv/Fm)were maintained at an optimal value(>0.815). The results showed the PSⅡ photosynthetic activity, photochemical efficiency
and photochemical reaction energy of two tree species declined with the increasing groundwater depth, whereas the ability to withstand high light intensity were decreased, which would result in greater excess of excited energy and increasing the potential risk of light injury. However, two species employed the
stress-resistance and self-regulation mechanism to enhance heat dissipation and alleviate injury on PSⅡ. Thus, two species could keep higher photosynthetic efficiiency in desert and environment. The comparison of chlorophyll fluorescence parameters of P. euphratica and P. pruinosa indicated that, at different groundwater depths, P. euphratica had higher PSⅡ photosynthetic activity, photochemical efficiency and drought-resistance abbitity, which indicated that P. euphratica had a better ecologically adaptation mechanism to desert environment than P. pruinosa. Currently, the desert dominant species grow normally at 5 m groundwater level in the upper reaches of Tarim River. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |