[Seasonal characteristics of δD and δ18O in precipitation and its water vapor sources in the Xiaolangdi Reservoir area of Yellow River, China].

The seasonal characteristics of δD and δ¹⁸O in precipitation and the influence factors were studied in the Xiaolangdi Reservoir area at the eastern monsoon region of China. The precipitation samples and the corresponding meteorological data were collected between April and October from the year 2011 to 2014. The local meteoric water lines (LMWL) of different seasons were established, and the water vapor sources in different seasons were investigated.

[Effects of drought stress on growth and water use efficiency of two medicinal plants].

Growth characteristics, stable carbon isotope discrimination (Delta13C), water use efficiency (WUE), and their correlation of Cassia obtusifolia and Isatis indigotica were measured at three soil water levels, i. e., 30%, 50% and 75% of field water holding capacity (FWHC), and at three growth stages.

[Diurnal variation of Quercus variabilis trunk diameter in response to environmental factors at south aspect of Taihang Mountains].

By using Circumference Dendrometer 2 (DC2), this paper studied the diurnal variation of trunk diameter in Quercus variabilis plantation at the south aspect of Taihang Mountains. During seasonal drought, the diurnal variation of Q. variabilis trunk diameter was quite evident.

[Measurement accuracy of granier calibration based on transpiration of Platycladus orientalis].

In order to understand the accuracy of Granier' s thermal dissipation method in measuring tree water consumption, a comparative study was made from May to June, 2010. The sap flow density of potted Platycladus orientalis was measured with thermal dissipation probe, which was compared with the whole-plant gravimetric measurement. There were significant linear relationships (R2 > 0.