干旱区生态环境知识资源中心(Arid): 干旱胁迫对桂西南石漠化地区主要造林树种光合与耗水特性的影响

Arid

	干旱胁迫对桂西南石漠化地区主要造林树种光合与耗水特性的影响
其他题名	Effects of drought stress on photosynthesis and water consumption of main afforestation tree species in the rocky desert area in Southwest Guangxi
	欧芷阳; 庞世龙; 谭长强; 何峰; 陆国导; 申文辉
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2020
卷号	39 期号:10 页码:3237-3246
中文摘要	研究植物耐旱特性和耗水问题对困难立地植被恢复的树种选择具有重要意义。以桂西南岩溶山地常见造林树种肥牛树(Cephalomappa sinensis) 、香樟(C_innamomum camphora)和仪花(Lysidice rhodostegia) 2年生实生苗为对象,采用盆栽苗木称量法和Li-6400光合系统测定方法相结合,研究不同土壤水分条件下3个树种的光合特性、水分利用效率和蒸腾耗水特性。结果表明: 3个树种苗木净光合速率(P_n) 、气孔导度(G_s)和蒸腾速率(T_r)随土壤干旱胁迫增强呈下降趋势;胞间CO_2浓度(C_i)随干旱增强先呈下降趋势,至重度干旱时显著升高,气孔限制值(Ls)则随干旱增强呈增加趋势,至重度干旱时则显著下降(P<0.05);轻度和中度干旱胁迫导致苗木P_n下降的主要原因为气孔因素;重度干旱胁迫下P_n下降的主要原因为非气孔因素。肥牛树在轻度干旱胁迫下水分利用效率最高,至重度干旱胁迫时显著下降;香樟和仪花的水分利用效率随干旱胁迫增强而增加,以中度干旱时期最高,至重度干旱时显著下降(P<0.05);苗木全天耗水量均随干旱胁迫增强而下降,相同土壤水分条件下以仪花的全天耗水量最高;耗水速率日变化均为单峰曲线,耗水速率最大峰值在不同土壤水分条件下有所不同;在轻度和中度干旱下,以仪花的白天平均耗水速率最高,重度干旱下以肥牛树的白天平均耗水速率最高,仪花其次;隶属函数分析结果显示,综合评价值的大小顺序为肥牛树>香樟>仪花,苗木的隶属函数加权平均值介于0.3~0.5, 具有中等抗旱特性。
英文摘要	Understanding the drought tolerance and water consumption of plants is significant for selecting suitable tree species for vegetation restoration in arid and barren sites. In this study,we measured those characteristics of two-year-old seedlings of three common afforestation species, Cephalomappa sinensis, C_innamomum camphora, and Lysidice rhodostegia, in the karst mountains of Southwest Guangxi. The water consumption characteristics were measured by pot seedling weight method,and photosynthetic characteristics were measured by LI-6400XT photosynthetic system under different soil drought stress levels. The results showed that net photosynthetic rate (P_n),stomatal conductance (G_s),and transpiration rate (T_r) of the three species decreased with increasing drought stress. The intercellular CO_2 concentration (C_i) tended to decrease,and then significantly increased during severe drought (SD) stress. By contrast,the stomatal limitation value (Ls) tended to increase,then significantly decreased during SD (P<0.05) . Stomatal factor led to the decrease of P_n under light drought (LD) and moderate drought (MD) stress,while non-stomatal factor caused P_n to decrease under SD stress. Water use efficiency (WUE) of C. sinensis during LD was the highest,but decreased significantly under SD. The WUE of C. camphora and L. rhodostegia tended to increase as soil drought stress increased,with the highest values appearing during MD. The WUE of both species significantly decreased during SD stress (P < 0.05) . The daily total water consumption of all the species decreased with increasing drought stress,with that of L. rhodostegia being the highest under the same soil water content. The diurnal variation of water consumption rate of all the three species was a single peak curve,while the maximum peak differed in different periods of drought stress. The average water consumption rate of L. rhodostegia in the daytime was the highest under LD and MD. During SD stress,the average water consumption rate of C. sinensis in the daytime was the highest,followed by L. rhodostegia. A subordinate function analysis showed that the comprehensive drought tolerance was in the order of C. sinensis>C. camphora>L. rhodostegia. The subordinate function weighted average values of all the three species were between 0.3 and 0.5,indicating that the three species had moderate resistance to soil drought stress.
中文关键词	干旱胁迫 ; 光合特性 ; 耗水 ; 水分利用效率 ; 隶属函数法
英文关键词	drought stress photosynthetic characteristics water consumption water use efficiency subordination function method
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6820372
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353803
作者单位	欧芷阳, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国. 庞世龙, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国. 谭长强, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国. 何峰, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国. 陆国导, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国. 申文辉, 广西壮族自治区林业科学研究院, 南宁, 广西 530002, 中国.
推荐引用方式 GB/T 7714	欧芷阳,庞世龙,谭长强,等. 干旱胁迫对桂西南石漠化地区主要造林树种光合与耗水特性的影响[J],2020,39(10):3237-3246.
APA	欧芷阳,庞世龙,谭长强,何峰,陆国导,&申文辉.(2020).干旱胁迫对桂西南石漠化地区主要造林树种光合与耗水特性的影响.生态学杂志,39(10),3237-3246.
MLA	欧芷阳,et al."干旱胁迫对桂西南石漠化地区主要造林树种光合与耗水特性的影响".生态学杂志 39.10(2020):3237-3246.