干旱区生态环境知识资源中心(Arid): 塔里木河下游地下水埋深对胡杨气体交换和叶绿素荧光的影响

Arid

	塔里木河下游地下水埋深对胡杨气体交换和叶绿素荧光的影响
其他题名	Effects of groundwater depth on the gas exchange and chlorophyll fluorescence of Populus euphratica in the lower reaches of Tarim River
	陈亚鹏 1; 陈亚宁1 ; 徐长春 2; 李卫红1 ; 付爱红 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2011
卷号	31 期号:2 页码:344-353
中文摘要	为了分析干旱环境下地下水埋深变化对胡杨(Populus euphratica oliv.)光合作用的影响,对塔里木河下游3个地下水埋深(4.91,6.93m和8.44m)环境下胡杨叶片的气体交换日变化,光响应曲线,PN-Ci曲线以及叶绿素荧光特性等进行了比较研究.研究结果表明:当地下水埋深从4.91m增加到6.93m和8.44m,胡杨光合速率(PN)(10:00),初始荧光(F0),最大荧光(Fm),以及PSⅡ实际光化学效率(OmegaPSⅡ),电子传递速率(ETR),非光化学猝灭系数(NPQ)和正午叶水势(Psimidday)等都发生了明显变化,其中胡杨NPQ增加了109%-127%,OmegaPSⅡ,ETR和Psimidday分别减小了24%-29%,17%-22%和31.6%-45.6%,表明胡杨受到的干旱胁迫程度在增加;而当地下水埋深在6.93-8.44m之间时,上述参数无显著变化,表明胡杨很可能处于相同干旱胁迫程度;并且在地下水埋深4.91-8.44m范围内,最大光化学效率(Fv/Fm),表观量子效率(phi), Rubisco羧化速率(Vcmax),等参数都未发生明显变化,表明即使地下水埋深增加到8.44m,此时的干旱胁迫程度也未超过胡杨的耐受能力,其光合能力也未受到不可逆转的伤害
英文摘要	To reveal the effects of groundwater depth change on gas exchange and chlorophyll fluorescence of Populus euphratica grown in arid region,we measured and conducted comparative studies among the daily course of gas exchange, light response curve, photosynthetic response to CO2(PN-Ci curve), chlorophyll fluorescence parameters, leaf water potential, and chlorophyll content of P.euphratica grown at different groundwater depths(4.91m,6.93m and 8.44m) in the lower reaches of Tarim River. The results showed that the net photosynthetic rates(PN) measured at 10:00, the minimal fluorescence(F0), the maximal fluorescence(Fm), the actual photochemical efficiency of PSⅡ(OmegaPSⅡ), the apparent rate of electron transport(ETR), the non-photochemical quenching coefficient(NPQ) and the leaf water potential measured at noon(Psimidday) were obviously changed with the groundwater depth increasing from 4.91m to 6.93m and 8.44m. Among them NPQ increased by 109%-127%, suggesting that P.euphratica could increase the thermal dissipation of excess excitation energy by NPQ process to avoid suffering the damage of photosynthetic apparatus. However,OmegaPSⅡ decreased by 24%-29%, indicating that the increasing groundwater depth resulted in the photochemical change of light-adapted leaves. Moreover,F0 decreased by 12.2%-18%, Fm decreased by 7%-15.5%,ETR decreased by 17%-22%, and Psimidday decreased by 31.6%-45.6% respectively, showing that the degree of drought stress from which P.eupuratica suffered would increase when the groundwater depth increased from 4.91m to 6.93m and 8.44m. Additionally, when the groundwater depth increased from 6.93m to 8.44m, the Fm,FV/F0 and F0 measured at predawn and noon did not change obviously, showing that P.euphratica could hold the PSⅡ photochemical activity and the PSⅡ reaction center was not damaged under this condition. Similarly,Psimidday,OmegaPSⅡ and ETR also did not change significantly, showing that trees grown at groundwater depths between 6.93m and 8.44m likely suffered from the same degree of drought stress. When the groundwater depth ranged from 4.91m to 8.44m, the apparent quanta efficiency(phi) changed slightly, with minimal damage to photosynthetic structures;and the maximum velocity of Rubisco for carboxylation(Vcmax), the maximum potential rate of electron transport(J) and the triose phosphate utilization rate(TPU) did not change markedly, suggesting that p.euphtatica can keep the activity of electron transport on a certain extent and the output quantity of triose phosphate from leaves;simultaneously, the photochemical quenching(qP) changed insignificantly with the increasing groundwater depths, indicating that the opening degree of PSⅡ reaction center of P.euphratica grown at different groundwater depths was approximate the same. Moreover, the maximal photochemical efficiency of PSⅡ(Fv/Fm) measured at predawn and noon possessed the higher values ranging from 0.85 to 0.87 and from 0.81 to 0.82, respectively, indicating that PSⅡ original photochemical efficiency was not influenced and the photosynthetic structures were not damaged by the increasing drought stress. Overall, the drought stress degree P.eupuratica suffered from within the groundwater depths 4.91-8.44 m was not beyond the tolerance of trees, that is, the photosynthetic capability of P.eupuratica did not get an irreversible harm even if the groundwater depth increased to 8.44m
中文关键词	胡杨(Populus euphratica oliv.) ; 叶绿素荧光 ; 地下水埋深 ; 光合作用
英文关键词	Populus euphratica chlorophyll fluoresce groundwater depth photosynthesis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:4120015
来源机构	中国科学院新疆生态与地理研究所 ; 新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226878
作者单位	1.中国科学院新疆生态与地理研究所, 中国科学院绿洲生态与荒漠环境重点实验室, 乌鲁木齐, 新疆 830011, 中国; 2.新疆大学资源与环境科学学院, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	陈亚鹏,陈亚宁,徐长春,等. 塔里木河下游地下水埋深对胡杨气体交换和叶绿素荧光的影响[J]. 中国科学院新疆生态与地理研究所, 新疆大学,2011,31(2):344-353.
APA	陈亚鹏,陈亚宁,徐长春,李卫红,&付爱红.(2011).塔里木河下游地下水埋深对胡杨气体交换和叶绿素荧光的影响.生态学报,31(2),344-353.
MLA	陈亚鹏,et al."塔里木河下游地下水埋深对胡杨气体交换和叶绿素荧光的影响".生态学报 31.2(2011):344-353.