干旱区生态环境知识资源中心(Arid): 干旱胁迫下广东石漠化地区造林树种光合和耗水特性

Arid

	干旱胁迫下广东石漠化地区造林树种光合和耗水特性
其他题名	Photosynthetic and water consumption of tree species utilized for afforestation of rocky desert in Guangdong Province
	吴俊文; 刘珊; 李吉跃; 何茜; 苏艳; 邱权; 白晶晶; 王燕; 贾朋
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:11 页码:3429-3440
中文摘要	石漠化地区土层稀薄、干旱贫瘠、植被破坏、生态恶化等问题较为突出,人工恢复森林植被是一项快速有效的生态恢复途径。采用盆栽苗木称重法和Li-6400光合系统测定方法分别测定3个常见石漠化造林树种浙江润楠(Machilus leptophylla),枫香(Liquidambar formosana)和亮叶含笑(Michelia fulgens Dandy)苗木在不同土壤水分条件下耗水特性和光合特性,为进一步筛选和评价石漠化地区造林树种抗旱特性提供理论依据。研究结果表明: (1)整个干旱胁迫期间,3种幼苗叶片的净光合速率(Pn) 、气孔导度(Gs) 、蒸腾速率(Tr)和胞间CO_2浓度(Ci)持续下降。重度干旱时,浙江润楠光合和水分利用效率分别是枫香的2.5倍、89.6倍和亮叶含笑的1.9倍、26.3倍。(2)干旱胁迫中期和后期,枫香和亮叶含笑净光合速率(Pn)和气孔导度(Gs)下降而胞间CO_2浓度(Ci)升高,说明Pn下降的主要原因已经由气孔因素转变为非气孔因素的限制。(3) 3个石漠化树种在不同干旱胁迫下日耗水总量和日平均耗水速率均存在显著性差异(P<0.05),白天耗水量占总耗水量74%-92%之间。浙江润楠在重度干旱时期还对水分要求还比较大,维持一个相对较高的耗水速率,是枫香和亮叶含笑的3.7倍和2.2倍。(4)不同干旱胁迫下,3个石漠化树种耗水速率日变化均表现出单峰曲线,不同干旱胁迫下峰值点会发生变化。(5)综合来看,浙江润楠和枫香是相对高光合和高水分利用效率树种。隶属函数结果表明,在正常、轻度和重度干旱下抗旱能力均为枫香>浙江润楠>亮叶含笑,重度干旱下为浙江润楠>枫香>亮叶含笑。
英文摘要	In rocky regions affected by desertification,prominent problems of thin soil,destruction of arid vegetation,and ecological deterioration present a big challenge to afforestation. Artificial recovery of forests is a quick and effective approach to restore the ecology of a region. Pot seedlings weight and Li-6400 photosynthetic system measuring method were adopted to study water consumption and photosynthetic characteristics under drought stress in Machilus leptophylla,Liquidambar formosana,and Michelia fulgens. The results were as follows: (1) The net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),and intercellular carbon dioxide concentration (Ci) declined in the three karst species. During severe drought,photosynthesis and water use efficiency of Machilus leptophylla were 2.5-and 89.6-fold higher than those of Liquidambar formosana and 1.9-and 26.3-fold higher those of Michelia fulgens,respectively. (2) Drought stress in the middle and late growth season decreased leaf Pn and Gs in Liquidambar formosana and Michelia fulgens but increased the Ci,suggesting that non-stomatal limitations contributed to the decrease in Pn. (3) The total water consumption and daily average water consumption rate of the three species showed significant differences (P < 0.05). The daytime water consumption was 74%-92% of the total daily water consumption. Machilus leptophylla showed a high demand for water with a relatively high water consumption rate that was 3.7-and 2.2-folds higher than that of Liquidambar formosana and Michelia fulgens. (4) Diurnal variation in water consumption rate showed a single peak curve in all three tree species,and the peak changed under different drought stress. (5) Over all,Machilus leptophylla and Liquidambar formosana are species with relatively high photosynthetic rate and water use efficiency. The subordinate function results showed the drought resistance ability in the following order: Liquidambar formosana > Machilus leptophylla > Michelia fulgens,under normal, mild,and severe drought stress conditions,and Machilus leptophylla > Liquidambar formosana > Michelia fulgens,under severe drought stress.
中文关键词	石漠化造林树种 ; 干旱胁迫 ; 光合 ; 耗水
英文关键词	rocky desertification afforestation tree species drought stress photosynthetic water consumption
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5725162
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234785
作者单位	华南农业大学林学与风景园林学院, 广州, 广东 510642, 中国
推荐引用方式 GB/T 7714	吴俊文,刘珊,李吉跃,等. 干旱胁迫下广东石漠化地区造林树种光合和耗水特性[J],2016,36(11):3429-3440.
APA	吴俊文.,刘珊.,李吉跃.,何茜.,苏艳.,...&贾朋.(2016).干旱胁迫下广东石漠化地区造林树种光合和耗水特性.生态学报,36(11),3429-3440.
MLA	吴俊文,et al."干旱胁迫下广东石漠化地区造林树种光合和耗水特性".生态学报 36.11(2016):3429-3440.