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- W3048398934 abstract "Abstract A. fruticosa ( Amorpha fruticosa L.) is widely used for revegetation in semiarid lands that undergo secondary salinization. Understanding A. fruticosa plants response to soil water and salt stress is essential for water irrigation management and proper revegetation practices. In this study, we measured sap flow, stomatal conductance, meteorological and soil characteristics in an A. fruticosa community that recently experienced secondary salinization in northwestern China. Results of our study showed that daytime and nocturnal sap flows averaged 804.37 g·cm −2 ·day −1 and 46.06 g·cm −2 ·day −1 , respectively, during the growing season. Within individual days, the highest sap flow appeared around noon local time and followed a similar pattern of photosynthetically active radiation ( PAR ). Despite the significant effect of meteorological factors on the characteristics of sap flow, our study highlighted that the sap flow of A. fruticosa is strongly regulated by the availability of soil relative extractable water ( REW ). The daytime sap flow, which is predominant compared to nocturnal sap flow, was strongly affected by PAR , air temperature and vapor-pressure deficit. With water stress in the top 40 cm of the soil ( REW 0–40 cm < 0.4), daytime sap flow displayed a strong relationship with soil water content ( SWC ) (positive) and soil electrical conductivity ( EC ) (negative) in the relatively shallow soil profile (up to 40 cm). For the nocturnal sap flow, our results suggest that in the absence of soil water stress ( REW 0–40 cm > 0.4), the nocturnal sap flow is mainly used to replenish the stem water content and sustain nocturnal transpiration. Under soil water stress, nocturnal sap flow is mainly used to replenish stem water content. The results of our study indicate that it is necessary to shorten the irrigation cycle during the primary growing period (May–July) of A. fruticosa. Moreover, in the absence of soil water stress ( REW 0–40 cm > 0.4), A. fruticosa can survive well in an saline environment with soil EC < 5 mS·cm −1 ." @default.
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- W3048398934 date "2020-08-11" @default.
- W3048398934 modified "2023-10-16" @default.
- W3048398934 title "Sap flow of Amorpha fruticosa: implications of water use strategy in a semiarid system with secondary salinization" @default.
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- W3048398934 doi "https://doi.org/10.1038/s41598-020-70511-2" @default.
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