Water utilization strategy of Ziziphus jujuba under different sand cover thicknesses based on stable isotope tracing
Aims Sand cover conditions in arid zones significantly affect soil water status,which in turn affects the utilization of soil water by vegetation.However,little is known about the water uptake strategies of Ziziphus jujuba under different sand cover conditions and its dynamic response to input water.Methods In this study,the water utilization strategies of Z.jujuba under different sand cover thicknesses and their responses to input water were investigated using the hydroxide stable isotope method combined with a Bayesian mixed model(MixSIAR).Important findings We found that the peak of soil water content(SWC)appeared on the 2nd day after irrigation in the non-sand-covered sample plots,on the 4th day after irrigation in the 5 cm sand-covered sample plots,and on the 6th day after irrigation in the 10 and 15 cm sand-covered sample plots.Sand cover significantly increased the SWC,and enhanced the water retention of the soil.The oxygen stable isotope composition(δ18O)and hydrogen stable isotope composition(δ2H)were-5.4‰--2.2‰ and-76.1‰--61.0‰ in the non-sand-covered sample plots,and-5.6‰--3.0‰ and-61.0‰--75.7‰ in the sand-covered sample plots,respectively.The 2nd,4th,and 6th day after irrigation,the percentage of water utilization by Z.jujuba in the 0-10 cm soil layer without sand cover(16.2％,9.1％,10.0％)was stable compared with that in the 5,10,15 cm sand-covered sample plots(73.0％,54.5％,37.0％;49.0％,46.2％,22.8％;27.1％,36.1％,21.4％)and sand-covering measures increased the date palm's water utilization of the 0-10 cm soil water.The sand mulching measures increased the utilization of 0-10 cm soil water by Z.jujuba,i.e.there was a lag in the utilization of deep soil water by Z.jujuba.The above results show that sand mulching can effectively improve the water retention of soil and influence the water utilization strategy of plants,which has implications for the adaptation of plants to local drought conditions and other environmental changes.
万方数据
维普
