Hydrogen Stable Isotope Characteristics of the Precipitation Allocation Processes in Sub-Alpine Dark Coniferous Forest in Wolong, Sichuan Province Effects of Rainfall on Soil Temperature, Moisture and Water Movement of Platycladus orientalis on Rocky Hills of North China Water Use of Helianthemum songaricum and Co-Occurring Plant Species Sarcozygium xanthoxylum in Western Ordos Characteristics of Hydrogen Stable Isotope in Soil Water of Sub-Alpine Dark Coniferous Forest in Wolong, Sichuan Province Water use strategies of Malus toringoides and its accompanying plant species Berberis aemulans