干旱区生态环境知识资源中心(Arid): 白榆冠层蒸腾及其对环境因子响应的边界线

Arid

	白榆冠层蒸腾及其对环境因子响应的边界线
其他题名	Characteristics and Boundary Line Analysis of Canopy Transpiration of Ulmus pumila to Environmental Driving Factors
	韩磊; 黄晓宇; 韩永贵; 高阳; 展秀丽
来源期刊	东北林业大学学报
ISSN	1000-5382
出版年	2019
卷号	47 期号:12 页码:22-27
中文摘要	以宁夏河东沙区防护林树种白榆(Ulmus pumila)为研究对象,采用热扩散茎流计实时监测林木树干液流,分析不同天气条件下蒸腾耗水特性;为避免时滞产生的回环效应,采用边界线分析法研究白榆冠层蒸腾(Ec)对大气环境响应的最佳估计。结果表明:(1)白榆冠层蒸腾速率由大到小晴天、阴天、雨天,并在晴天条件下出现午休现象;日平均液流速率为晴天467.97 g·h~(-1)、阴天320.08 g·h~(-1)和雨天44.62 g·h~(-1),且夜间液流速率不为0。白榆日耗水量分别为(10.060.84)kg·d~(-1)(晴天)、(8.020.48)kg·d~(-1 )(阴天)和(1.060.01)kg·d~(-1)(雨天),其中夜间耗水量分别占全天耗水量的2.1%、3.0%和3.8%。(2)大气环境因子与白榆冠层蒸腾呈极显著相关关系(P<0.01),对Ec的影响从大到小依次为太阳辐射(R_(PA))、大气温度(T_a)、水汽压亏缺(D_(VP)), 分别可以解释41.1%、20.3%和4.4%的变量。(3)边界线分析得出,引起气孔调节的太阳辐射阈值为245 W·m~(-2);当D_(VP) >1.35 kPa林木冠层蒸腾对水汽压饱和亏缺的响应敏感性降低,T_a>25.9℃和T_a<20.1℃时,成为诱导白榆气孔调节行为、限制冠层蒸腾的关键临界点。
英文摘要	In order to quantify the diurnal variation of forest transpiration response to environmental factors in arid areas,Ulmus pumila,a typical tree species of protection forest growing in east sandy land of Yellow River in Ningxia was studied in a field trial. The Granier thermal dissipation probe technology was used in monitoring the sap flow continuously in the treegrowing season to clarify the characteristics of water consumption by transpiration under different weather conditions. To avoid the hysteresis loops effect caused by time lag,a boundary line analysis was used to describe the responses of canopy transpiration to meteorological factors,and the best estimation of canopy transpiration response to environmental factors was obtained. The daily canopy transpiration rate of U. pumila on sunny days>cloudy days>rainy days,andthe noon break of stem-flow velocityphenomenon was found during 12 to 16 o'clock on the sunny days. Daily average sap flow velocity was 467.97 g·h~(-1)on sunny days,320.08 g·h~(-1)on cloudy days and 44.62 g·h~(-1)on rainy days separately. The diurnal change showed that the nighttime sap flow velocity was not zero. The daily water consumption of U. pumila was 10.060.84 kg·d~(-1)on sunny days,8.020.48 kg·d~(-1)on cloudy days and 1.060.01 kg·d~(-1)on rainy days,in which the water consumption at night accounted for 2.1%,3.0% and 3.8% of the whole day under different weather conditions,respectively. The variables as vapor pressure deficit(D_(VP)),air temperature(T_a),and solar radiation(R_(PA))were significantly correlated with canopy transpiration of U. pumila(P<0.01). Based on the Pearson correlations and partial correlations analysis,the ranked factors from strong to weak correlated with the influence on Ec were R_(PA) >T_a >D_(VP),explained 41.1%,20.3% and 4.4% of the total variation. Boundary line analysis indicated that the threshold of solar radiation causing stomatal regulation was 245 W·m~(-2),and the sensitivity of canopy transpiration responses to water vapor pressure saturation deficit decreased when D_(VP) >1.35 kPa. It became the critical point to induce stomatal regulation and restrict canopy transpiration of U. pumila when T_a is greater than 25.9 ℃ or less than 20.1 ℃.
中文关键词	白榆(Ulmus pumila) ; 树干液流 ; 耗水量 ; 冠层蒸腾 ; 边界线分析
英文关键词	Ulmus pumila Sap flow Water consumption Canopy transpiration Boundary line analysis
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6632350
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353219
作者单位	韩磊, 宁夏大学, 银川, 宁夏 750021, 中国. 黄晓宇, 宁夏大学, 银川, 宁夏 750021, 中国. 韩永贵, 宁夏大学, 银川, 宁夏 750021, 中国. 高阳, 宁夏大学, 银川, 宁夏 750021, 中国. 展秀丽, 宁夏大学, 银川, 宁夏 750021, 中国.
推荐引用方式 GB/T 7714	韩磊,黄晓宇,韩永贵,等. 白榆冠层蒸腾及其对环境因子响应的边界线[J],2019,47(12):22-27.
APA	韩磊,黄晓宇,韩永贵,高阳,&展秀丽.(2019).白榆冠层蒸腾及其对环境因子响应的边界线.东北林业大学学报,47(12),22-27.
MLA	韩磊,et al."白榆冠层蒸腾及其对环境因子响应的边界线".东北林业大学学报 47.12(2019):22-27.