Relationships between Sap Flow Densities in Tree Trunks of Salix matsudana and Populus simonii and Meteorological Factors in the Mu Us Sandland
In this study,the spatiotemporal variations of sap flow densities in tree trunks of Salix matsudana and Populus simonii and their relationships with meteorological factors in the Mu Us Sandland were explored so as to achieve a harmonic development of water and ecology.The Granier's thermal dissipation probe method was used to measure the azimuthal and radial sap flow densities in tree trunks of S.matsudana and P.simonii.The results indicated that the daily variation of sap flow densities in the tree trunks at different directions was similar with a good correlation,but the values were quite different.The measured results at different depths were alsor similar.If the variations of such directions and depths were ignored,the maximum error of the calculated whole-tree water consumption could be up to 104％.The correlation analysis between the sap flow density and the metrological factors revealed that the correlation of sap flow densities in tree trunks of S.matsudana and P.simonii with the net radiation was the best,and then with the air temperature.The analyzed results showed that there was no time lag between the sap flow density and the net radiation,but there was one-hour time lag between the sap flow density and vapor pressure deficit.Thus the direction and the depth of probe must be considered when estimating the plant water consumption based on the results of sap flow density.
sap flow densitySalix matsudanaPopulus simoniispatiotemporal variationmeteorological factorMu Us Sandland
国家科技期刊平台
NSTL
万方数据
维普
