ASSESSMENT OF TRANSPIRATION ESTIMATES FOR PICEA-ABIES TREES DURING A GROWING-SEASON

被引：52

作者：

CIENCIALA, E

LINDROTH, A

CERMAK, J

HALLGREN, JE

KUCERA, J

机构：

[1] Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Uppsala

[2] Institute of Forest Ecology, University of Agricultural Sciences, Brno-Soběšice

[3] Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umeå

来源：

TREES-STRUCTURE AND FUNCTION | 1992年 / 6卷 / 03期

关键词：

HEAT BALANCE METHOD; CANOPY CONDUCTANCE; SAP-FLOW RATE; PENMAN-MONTEITH EQUATION; SCALING;

D O I：

10.1007/BF00202427

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

The tree-trunk heat balance method with internal heating and sensing of temperature was used to estimate sap-flow rate of spruce trees in a stand in southern Sweden. Sap-flow rate values were scaled up to stand transpiration and utilised for calculation of canopy conductance. The calculated values provided the basis for a function relating canopy conductance to vapour pressure deficit, which was implemented in the Penman-Monteith equation. The stand was mostly growing in non-limiting soil water conditions (irrigation regime applied during dry periods). The whole-season transpiration was assessed by two different approaches and then compared: the sap-flow rate measurements were scaled to stand transpiration and the adapted Penman-Monteith estimate. They gave similar results: the transpiration totals differed by 3% and the coefficient of determination of the linear regression was r2 = 0.89. Similarly good was the assessment for a set of rainy days. The Penman-Monteith estimate adapted in this way proved to be reasonably precise and reliable in this forest stand and usable even in wet conditions. The seasonal transpiration of the spruce stand was 392 mm according to the adapted Penman-Monteith equation. Mean daily transpiration was 1.8 mm and daily maximum transpiration was 4.8-4.9 mm as estimated by sap-flow rate measurements.

引用

页码：121 / 127

页数：7

共 35 条

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