黄土丘陵区土壤水分对黄刺玫叶片光响应特征参数的影响
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- 英文论文题名：Effects of soil moisture on the photosynthetic light reaction of Rosa xanthina L. in a loess hilly region
- 论文作者：夏宣宣 ; 张光灿
- 英文论文作者：Xia Xuanxuan ; Zhang Guangcan ; Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration ; Forestry College of Shandong Agricultural University ; Taishan Forest Eco-station of State Forestry Administration
- 年：2015
- 作者机构：山东省土壤侵蚀与生态修复重点实验室/国家林业局泰山森林生态站/山东农业大学林学院;
- 论文关键词：光合作用 ; 黄刺玫 ; 土壤水分 ; 黄土丘陵区 ; 等级划分
- 英文论文关键词：photosynthesis ; Rosa xanthina L. ; soil water ; loess hilly region ; grade division
- 会议召开时间：2015-09-01
- 会议录名称：2015海峡两岸水土保持学术研讨会论文集（下）
- 英文会议录名称：Proceedings of Cross-strait Symposium on Soil and Water Conservation 2015
- 语种：中文
- 分类号：S152.7;Q945
- 学会代码：OGSJ
- 会议名称：2015海峡两岸水土保持学术研讨会
- 会议地点：中国山西太原
- 主办单位：中国水土保持学会、台湾中华水土保持学会
- 学会名称：中国水土保持学会
- 页数：8
- 文件大小：2145k
- 原文格式：O
- 会议级别：全国
摘要
在半干旱黄土丘陵区,以3年生黄刺玫(Rosa xanthina L.)植株为材料,采用盆栽控水试验,利用CIRAS-2型便携式光合作用测定系统,在8个土壤水分含量下测定了黄刺玫叶片的光响应过程。探讨了黄刺玫光合生理参数与土壤水分的定量关系及土壤水分效应等级划分问题。结果表明:黄刺玫的净光合速率(P_n)、光合量子效率(Φ)、水分利用效率(WUE)、胞间CO,浓度(C_i)和蒸腾速率(T_r)对土壤水分都具有明显阈值响应特征。土壤相对含水量(RWC)在36.2%~81.2%范围内,黄刺玫在强光下的P_n和WUE水平较高,光合作用不会发生明显的光抑制。RWC为66.5%左右时,Φ与P_n达到最高水平,表现出较强的光能利用潜力;RWC为81.2%为时,T_R达最大值,RWC为44.5%时,WUE为最大值。依据黄刺玫叶片P_n、C_i、T_r和WUE与土壤水分的定量关系,确定RWC在低于36.2%时为"低产低效"等级,在36.2%~44.5%之间为"低产高效"等级,44.5%~66.5%为"高产高效"等级,66.5%~81.2%为"高产中效"等级,在高于81.2%时为"低产低效"等级。
Water is a vital macronutrient and an important environmental factor,and is required for plants to conduct photosynthesis,which insufficient or excessive soil moisture will negatively affect.The soil water deficit is a key factor affecting plant physiological activity,restricting plant productivity and vegetative restoration.Rosa xanthina L.is one of the most widely distributed types of secondary vegetation in mountainous and hilly region in North China.Because of its high level of ecological adaptability,resistance to stress,and ecological functions,Rosa xanthina shows great potential value for development and application to the reconstruction of vegetation in the ecologically fragile Loess Plateau.Thus far,previous studies of Rosa xanthina have focused on such features as its root structure and soil reinforcement capabilities,the structure and ecological adaptations of its associated community,the morphology and anatomical structure of its leaves,and its photosynthetic characteristics.However,few studies have investigated the response relationship between photosynthesis and soil moisture,or the effective use of soil moisture by Rosa xanthina in arid habitats.The objectives of this study are to explore both the photosynthetic response to soil moisture and light and their quantitative relationship,and to attempt to identify the threshold effect of soil moisture on photosynthesis in Rosa xanthina L.In addition,this study aims to determine the species' photosynthetic productivity classification using physiological photosynthesis data.This new information will provide references that will help further our understanding of the water use and photophysiological characteristics of Rosa xanthina under drought stress.Three-year-oldRosa xanthina seedlings which were collected from the nursery and then potted in buckets were taken as materials in the semiarid loess hilly and gully regions.Sufficient water was provided to each seedling to saturate the soil in the bucket two days before the determination of photosynthetic parameters,and the soil water content was then monitored with no further watering.We measured soil water content and the photosynthetic parameters every two days until the seedlings withered.Using a CIRAS-2 portable photosynthesis system,the light reaction processes of Rosa xanthina plants were measured under eight soil moisture conditions found in the semiarid loess hilly region.The result showed that the net photosynthetic rate(P_n),quantum yield(Φ),and water use efficiency(WUE) exhibit clear threshold response characteristics.Higher photosynthetic rates(P_n) and WUE were observed in Rosa xanthina leaves when the relative soil water content(RWC)increased from 36.2% to 81.2%,and there was no significant photoinhibition of photosynthesis.When RWC was approximately 66.5%,Φ and P_n peaked,exhibiting strong potential energy utilization.The transpiration rate(T_r) and WUE peaked when RWC respectively were 81.2% and 44.5%.Based on the quantitative relationship between RWC and the plants' physiological photosynthetic characteristics,the RWC values measured when P_n,Φ,T_r,and WUE reached their respective maxima,and when RWC corresponded to the inflectional values of intercellular CO_2 concentration(C_i) were designated as points of differentiation.Thus,we propose a metric for the grading of soil moisture availability according to its effect on Rosa xanthina photosynthesis.Soils with an RWC lower than 36.2% are considered "low productivity and low efficiency" grade,those with an RWC of 36.2- 44.5% are considered "low productivity and high efficiency" grade,those with an RWC of 44.5- 66.5% are considered "high productivity and high efficiency" grade,those with an RWC of 66.5- 81.2% are considered "high productivity and medium efficiency" grade,and those with an RWC greater than 81.2% are considered "low productivity and low efficiency" grade.
Water is a vital macronutrient and an important environmental factor,and is required for plants to conduct photosynthesis,which insufficient or excessive soil moisture will negatively affect.The soil water deficit is a key factor affecting plant physiological activity,restricting plant productivity and vegetative restoration.Rosa xanthina L.is one of the most widely distributed types of secondary vegetation in mountainous and hilly region in North China.Because of its high level of ecological adaptability,resistance to stress,and ecological functions,Rosa xanthina shows great potential value for development and application to the reconstruction of vegetation in the ecologically fragile Loess Plateau.Thus far,previous studies of Rosa xanthina have focused on such features as its root structure and soil reinforcement capabilities,the structure and ecological adaptations of its associated community,the morphology and anatomical structure of its leaves,and its photosynthetic characteristics.However,few studies have investigated the response relationship between photosynthesis and soil moisture,or the effective use of soil moisture by Rosa xanthina in arid habitats.The objectives of this study are to explore both the photosynthetic response to soil moisture and light and their quantitative relationship,and to attempt to identify the threshold effect of soil moisture on photosynthesis in Rosa xanthina L.In addition,this study aims to determine the species' photosynthetic productivity classification using physiological photosynthesis data.This new information will provide references that will help further our understanding of the water use and photophysiological characteristics of Rosa xanthina under drought stress.Three-year-oldRosa xanthina seedlings which were collected from the nursery and then potted in buckets were taken as materials in the semiarid loess hilly and gully regions.Sufficient water was provided to each seedling to saturate the soil in the bucket two days before the determination of photosynthetic parameters,and the soil water content was then monitored with no further watering.We measured soil water content and the photosynthetic parameters every two days until the seedlings withered.Using a CIRAS-2 portable photosynthesis system,the light reaction processes of Rosa xanthina plants were measured under eight soil moisture conditions found in the semiarid loess hilly region.The result showed that the net photosynthetic rate(P_n),quantum yield(Φ),and water use efficiency(WUE) exhibit clear threshold response characteristics.Higher photosynthetic rates(P_n) and WUE were observed in Rosa xanthina leaves when the relative soil water content(RWC)increased from 36.2% to 81.2%,and there was no significant photoinhibition of photosynthesis.When RWC was approximately 66.5%,Φ and P_n peaked,exhibiting strong potential energy utilization.The transpiration rate(T_r) and WUE peaked when RWC respectively were 81.2% and 44.5%.Based on the quantitative relationship between RWC and the plants' physiological photosynthetic characteristics,the RWC values measured when P_n,Φ,T_r,and WUE reached their respective maxima,and when RWC corresponded to the inflectional values of intercellular CO_2 concentration(C_i) were designated as points of differentiation.Thus,we propose a metric for the grading of soil moisture availability according to its effect on Rosa xanthina photosynthesis.Soils with an RWC lower than 36.2% are considered "low productivity and low efficiency" grade,those with an RWC of 36.2- 44.5% are considered "low productivity and high efficiency" grade,those with an RWC of 44.5- 66.5% are considered "high productivity and high efficiency" grade,those with an RWC of 66.5- 81.2% are considered "high productivity and medium efficiency" grade,and those with an RWC greater than 81.2% are considered "low productivity and low efficiency" grade.
引文
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[5]叶子飘.光响应模型在超级杂交稻组合-Ⅱ优明86中的应用.生态学杂志,2007,26(8):1323-1326.
[6]曾小美,袁琳,沈允钢.拟南芥连体和离体叶片光合作用的光响应.植物生理学通讯,2002,38(1):25-26.
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[9]Chen Z Y,Peng Z S,Yang J,Chen W Y,Ouyang Z M.A mathematical model for describing light-response curves in Nicoliana tabacum L.Photosynthetica,2011,49(3):467-471.
[10]许大全.光合作用效率.上海:上海科学技术出版社,2002:13-13,99-101.
[11]夏江宝,张光灿,孙景宽,刘霞.山杏叶片光合生理参数对土壤水分和光照强度的阈值效应.植物生态学报,2011,35(3):322-329.
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[13]张淑勇,周泽福,张光灿,夏江宝.半干旱黄土丘陵区4种天然次生灌木光合生理和水分利用特征.林业科学,2008,44(12):140-146.
[14]吴正镒.中国植被.北京:科学出版社,1995:808-808.
[15]王芳,高甲荣,朱继鹏,高阳,胡封兵.晋西黄土高原三种灌木的根构型研究.干旱地区农业研究,2006,24(5):146-150.
[16]王暾,郭晋平,刘宁,张芸香.森林光环境对4种天然灌木的光合作用和形态的影响.林业科学,2011,47(6):56-63.
[17]薛智德,韩蕊莲,侯庆春,王胜琪,张振师.延安地区5种灌木叶旱性结构的解剖研究.西北植物学报,2004,24(7):1200-1206.
[18]杨朝瀚,王艳云,周泽福,张光灿.黄土丘陵区杠柳叶片气体交换过程对土壤水分的响应.林业科学研究,2006,19(2):231-234.
[19]张光灿,刘霞,周泽福,张淑勇,刘刚,陈建.黄土丘陵区油松水土保持林生长过程与直径结构.应用生态学报,2007,18(4):728-734.
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[21]张友焱,周泽福,程金花.退耕还林后圪针耳流域的土地承载力.农村生态环境,2003,19(3):5-8.
[22]许大全.光合作用气孔限制分析中的一些问题.植物生理学通讯,1997,33(4):241-244.
[23]Lang Y,Wang M,Zhang G C,Zhao Q K.Experimental and simulated light responses of photosynthesis in leaves of three tree species under different soil water conditions.Photosynthetica,2013,51(3);370-378.
[24]陈根云,俞冠路,陈悦,许大全.光合作用对光和二氧化碳响应的观测方法探讨.植物生理与分子生物学学报,2006,32(6):691-696.
[25]王荣荣,夏江宝,杨吉华,赵艳云,刘京涛,孙景宽.贝壳砂生境干旱胁迫下杠柳叶片光合光响应模型比较.植物生态学报,2013,37(2):111-121.
[26]叶子飘,王建林.植物光合-光响应模型的比较分析.井冈山学院学报:自然科学,2009,30(4):9-13.
[27]姚广,高辉远,王未未,张立涛,部建雯.铅胁迫对玉米幼苗叶片光系统功能及光合作用的影响.生态学报,2009,29(3):1162-1169.
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