干旱区生态环境知识资源中心(Arid): 基于热比率法的青海云杉林蒸腾量估算

Arid

	基于热比率法的青海云杉林蒸腾量估算
其他题名	Estimating whole-tree water use of Picea crassifolia based on heat ratio method
	杨军军 1; 封建民 1; 何志斌 2
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2018
卷号	42 期号:2 页码:195-201
中文摘要	流域上游森林蒸腾量的准确估算对于干旱区水资源管理至关重要。该文采用热比率法的树干液流技术对青海云杉(Picea crassifolia)单木和林分蒸腾量进行了估算和转换,目的在于通过该研究为不同尺度森林蒸腾量估算提供一个系统的解决方案。研究结果如下:第一,青海云杉胸径与边材面积间存在显著指数函数关系, R~2 = 0.94, p < 0.000 1;第二,热比率法的青海云杉蒸腾量测量中,理论值与观测值间的比例系数为1.09,观测值偏小;第三,基于单木平均液流速率和林分总边材面积的林分蒸腾量计算中,不同胸径样树液流速率的异质会导致液流速率被高估或低估近1/3;第四,基于单木胸径与液流量间关系的林分液流估算技术能够更合理地对青海云杉蒸腾量进行估算。根据该文研究结果,基于探针式液流测量技术可以更为科学地对单一树种研究区不同尺度的蒸腾量进行估算。
英文摘要	Aims Accurate estimation of forest transpiration in the upper reach of the watershed is vital to the management of water resources in arid region. The objective of this study was to provide a systematic method for calculating the forest evapotranspiration at different scales. Methods In this study we measured the whole-tree transpiration using the heat ratio method technology and estimated the stand- and catchment-transpiration employing the upscaling methods. Important findings The main results and conclusions were as follows: First, the diameter at breast height (DBH)exhibited significant correlations with sapwood area, and the correlation was characterized by the exponential function (R~2 = 0.94, p < 0.000 1). Second, in the weighted calculation of sap-flux measurements based on two-point thermocouples and sapwood area of Picea crassifolia, the correction coefficient between the true value and the observation value was 1.09. Third, when calculating sap-fluxes based on the average-sap-flux and total sapwood area of stand-transpiration, ignoring sap-flux velocity heterogeneities of trees led to transpiration rates being overestimated or underestimated by nearly one third; Fourth, the stand-transpiration estimation method based on the relationship between DBH and sap-flux can give a more reasonable prediction of Picea crassifolia transpiration. The results indicated that the probe-based sap-flux measuring technology would perform well for the transpiration scaling-up calculation at the catchment with only one single tree species, and the calculation methodology can be applied to other watersheds.
中文关键词	蒸腾量 ; 尺度上推 ; 热比率法 ; 青海云杉
英文关键词	transpiration upscaling heat ratio method Picea crassifolia
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:6220114
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238622
作者单位	1.咸阳师范学院资源环境与历史文化学院, 咸阳, 陕西 712000, 中国; 2.中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	杨军军,封建民,何志斌. 基于热比率法的青海云杉林蒸腾量估算[J],2018,42(2):195-201.
APA	杨军军,封建民,&何志斌.(2018).基于热比率法的青海云杉林蒸腾量估算.植物生态学报,42(2),195-201.
MLA	杨军军,et al."基于热比率法的青海云杉林蒸腾量估算".植物生态学报 42.2(2018):195-201.