Zhu Lin, Mao Guilian, Zheng Shuxin, Xu Xing. Water uptake from different soil depths for halophytic shrubs grown in northern area of Ningxia Plain (China) in contrasted water regimes. Journal of Plant Interactions, 2014, 9(1): 26-34. (SCI, IF=0.865)
Inorder to understand the contributionsofgroundwater and deepsoilwaterto the growthofhalophytesinsalinity-affectedarea,wateruse strategiesoffour shrubes, i.e. 20-year-old Tamarix ramosissima Ledeb., three-year-old T. ramosissima., Lycium barbarum L., and Atriplex canescens (Pursh) Nutt. were studied undercontrastedwaterregimesinNorthwestChina. The result showed that there was a vertical gradientinsoildelta O-18 and delta D profiles resultedfromevaporation and irrigation. The 20-year-old T. ramosissima mainly usedwaterfrommiddle (40-140 cm) and deep (140-200 cm) under bothwaterregimesindicating its phreatophytic nature.Soilwaterinupper profile (0-40 cm) was the dominantwatersourceforthe three-year-old T. ramosissima before irrigation. After irrigation, the three-year-old T. ramosissima and L. barbarum switched theirwatersources to middlesoilprofile. Our experiment revealed phreatophytic tendencyforthe three-year-old A. canescens, which was not responsive to irrigation enlighten by photosynthetic parameters and stemwaterpotentials.