详细信息
山茱萸光合及水分利用特征对土壤水分胁迫的响应 被引量:12
The effect of soil water stress on photosynthetic and water use characters of Cornus officinalis
文献类型:期刊文献
中文题名:山茱萸光合及水分利用特征对土壤水分胁迫的响应
英文题名:The effect of soil water stress on photosynthetic and water use characters of Cornus officinalis
作者:国琳[1] 张劲松[1] 孟平[1] 高峻[1] 黄辉[1] 贾长荣[2] 任迎丰[2]
第一作者:国琳
机构:[1]中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京100091;[2]济源市国有大沟河林场,河南济源454650
年份:2010
卷号:33
期号:1
起止页码:21-26
中文期刊名:河北农业大学学报
外文期刊名:Journal of Agricultural University of Hebei
收录:CSTPCD;;北大核心:【北大核心2008】;CSCD:【CSCD_E2011_2012】;
基金:国家十一五科技攻关课题(2006BAD03A11);中国林科院林业研究所所长基金(RIF2008-04)
语种:中文
中文关键词:山茱萸;土壤水分;光合速率;蒸腾速率;水分利用效率
外文关键词:Comus of fiincdis ; soil water; net photosynthetic rate; transpiration rate; water use efficiency
分类号:Q949.99;S153
摘要:为给华北低山丘陵区山茱萸栽培与管理提供必要的科学依据,本试验观测了不同土壤水分条件下华北石质山区3年生山茱萸叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)、气孔限制值(Ls)、水分利用效率(WUE)等参数的光响应过程,分析了水分胁迫对光合及水分利用特性的影响。结果表明:(1)土壤水分轻度(H1)、中度(H2)和重度胁迫(H3)条件下,山茱萸叶片光饱和点(LSP)比无水分胁迫(对照,CK)时分别低40%、60%和80%,晴天日光合速率最大值比CK分别低20.3%、40.0%和73.1%;(2)蒸腾速率(Tr)随光合有效辐射(PAR)的增加而上升,但重度水分胁迫条件下,上升趋势比较缓慢。对比CK,Tr在H1、H2和H3条件下分别下降了17.06%、34.05%和87.8%;(3)气孔导度(Gs)随着PAR的增加而逐渐上升。对比CK,H1、H2、H3在PAR为0-2 000μmol/(m^2.s)范围内,Gs平均值分别下降了23.26%、46.52%和89.03%。无水分胁迫—中度水分胁迫条件下,气孔限制是影响光合作用的主要原因,而土壤水分严重胁迫条件下,当PAR小于1 000μmol/(m^2.s)时,气孔限制是影响光合作用的主要原因,随后转变为非气孔限制;(4)水分利用效率(WUE)随着光合有效辐射(PAR)的增加迅速上升;当光合有效辐射(PAR)超过600μmol/(m^2.s)以后,水分利用效率(WUE)随着光强增加变化较小,基本维持在较高的水平。
Light responses of net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 (Ci), stomatal limitation value (Ls) and water use efficiency (WUE) about 3-year-old Comus officinalis were observed by Li-Cor 6400 in the rocky mountainous area of north China under different soil moisture conditions. Four soil water treatment levels were used by pot experiments about 75% (CK), 55% (H1), 40% (H2) and 30% (H3) of soil water holding capacity. The results showed that: (1) The light saturation point about H1, H2 and H3 of Comus officinalis were 40 %, 60% and 80 % lower than CK respectively, and the maximum values of net photosynthetic rate on sunny days were 20. 3%, 40.0% and 73.1%; (2) The transpiration rate increased with photosynthetic active radiation (PAR) under all treatments except for H3, and compared with the CK, Tr decreased about 17.06%, 34.05% and 87.8% under H1, H2 and H3 soil conditions; (3) The stomatal conductance (G,) increased gradually with the increase of PAR, and the average of G, decreased by 23.26%, 46.52% and 89.03% under H1, H2 and H3 treatments; under no water stress or slightly water stress condition, stomatal limitation was the main factor to impact photosynthesis, and for severe stress condition the main factor changed to non-stomatal limitation when PAR exceeded 1 000 μmol/ (m^2 ·s), (4) Water use efficiency (WUE) increased rapidly with the increase of photosynthetic active radiation (PAR), and increased slightly and kept at a fairly high level when/PAR rose above 600 μmol / (m^2· s).
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