干旱区生态环境知识资源中心(Arid): 冀西北坝上干旱区北京杨树干液流特征及影响因素分析

Arid

	冀西北坝上干旱区北京杨树干液流特征及影响因素分析
其他题名	Characteristics and the Driving Forces of Sapflow in Stems of Populus beijingensis in Bashang Area of North-west Hebei
	马长明; 马玉洁; 程月明
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2017
卷号	31 期号:6 页码:338-344
中文摘要	为了揭示冀西北坝上干旱区三北防护林主要树种北京杨的耗水特征,采用热扩散式茎流仪研究了不同健康等级北京杨的树干液流特征,同时分析了树干液流对气象因素和个体生长状态的响应。结果表明:北京杨树干边材液流无论是晴天还是阴天均表现出明显的昼夜变化规律,晴天启动早,停止晚;夜间也存在树干液流,健康杨树单株夜间耗水贡献率为2.50%~5.60%,不健康单株夜间耗水贡献率高达8.37%~21.20%。不同健康等级杨树单株水分消耗在0.01水平存在差异,不健康单株日均耗水量为(22.955.99)L,仅为健康单株的27.9%。树干液流速率与太阳辐射、空气温度、饱和水汽压差成正相关,与相对湿度成负相关,其中与大气温度、相对湿度相关性最强。树干液流与气象因子之间存在不同程度的时滞效应,健康和亚健康单株液流速率滞后于太阳辐射0.5 h,提前于空气温度、湿度、饱和水汽压差1 h;而不健康单株液流速率则滞后于太阳辐射1 h,与空气温度、湿度、饱和水汽压差同步。健康、亚健康和不健康北京杨单株单株生长季消耗水分分别为11 636.1,7 254.8,3 425.4L,当年232.2 mm的降水不能满足其水分消耗。表明水分不足对北京杨树干液流具有胁迫效应,制约杨树的生长。
英文摘要	In order to reveal the water consumption characteristics of dominant species-Populus beijingensis in the arid area of north-west Hebei,the stem flow characteristics of different health grades were studied by thermal diffusion stalk instrument.Meanwhile,meteorological factors,water factors and individual growth status were referred to analyses the driving forces.The results show that there were obvious diurnal changes both in the sunny and cloudy days,the stem flow started early and stopped late in the sunny.The contribution rate of nighttime water consumption of healthy Populus beijingensis was 2.50% ~5.60%,while the contribution rate of unhealthy nighttime water consumption was 8.37%~21.20%.The water consumption of Populus beijingensis in different health grades were significant different(P<0.01).The daily average water consumption of unhealthy plants was(22.955.99)L,which was only 27.9%of healthy plants.It was positively correlated with solar radiation,air temperature,saturated vapor pressure,and negatively correlated with relative humidity specific,air temperature and relative humidity were the most important.There were timelags between the sap flow in stems and the meteorological factors,the stems flow of health and sub-health individual occurred behind the solar radiation 0.5 h,while ahead of the air temperature,humidity,saturated vapor pressure difference 1 h.For Unhealthy individual,it kept pace withair temperature,humidity and saturation vapor pressure,while behind the solar radiation 1 h.Water consumption of healthy,sub-health and unhealthy individuals of of Populus beijingensis were 11 636.1,7 254.8 and 425.4L,respectively.The precipitation of 232.2 mm could not meet the water consumption.It has a stress effect and influences on the grow of Populus beijingensis because of the lack of water.
中文关键词	北京杨 ; 树干液流 ; 冀西北坝上 ; 枯稍 ; 健康等级
英文关键词	Populus Beijingensis sap flow Bashang area of Northern Hebei dry slightly health level
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:6136065
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236686
作者单位	河北农业大学林学院, 保定, 河北 071000, 中国
推荐引用方式 GB/T 7714	马长明,马玉洁,程月明. 冀西北坝上干旱区北京杨树干液流特征及影响因素分析[J],2017,31(6):338-344.
APA	马长明,马玉洁,&程月明.(2017).冀西北坝上干旱区北京杨树干液流特征及影响因素分析.水土保持学报,31(6),338-344.
MLA	马长明,et al."冀西北坝上干旱区北京杨树干液流特征及影响因素分析".水土保持学报 31.6(2017):338-344.