Study on water use characteristics of Caragana korshinskii in different seasons in arid sandy area of Ningxia

doi:10.16178/j.issn.0528-9017.20240458

Abstract

Abstract:

Caragana korshinskii is the main tree species for ecological reconstruction in arid sandy areas of Ningxia. In order to clarify the water use strategy of Caragana korshinskii in different seasons under drought and harsh environmental conditions in arid sandy areas of Ningxia, this study used stable isotope technology to determine the available water source and the isotope characteristic ratio of xylem water in branches. The IsoSource model was used to compare the main water sources and the contribution rate of each water source in different seasons from a qualitative and quantitative point of view. At the same time, combined with the characteristics of soil water recharge, the adaptation mechanism of Caragana korshinskii to drought and harsh environment was comprehensively analyzed. The results showed that the soil water content of Caragana korshinskii was significantly different in different seasons in the 0-60 cm soil layer. The average soil water content in the rainy season was 14.66%, while the soil water content in the dry season was only 9.69%. In the 80-200 cm soil layer, there was no significant difference in soil water content in different seasons. The contribution rate of each water source of Caragana korshinskii was different in different seasons. In the rainy season, the contribution rate of rainwater was as high as 93.00%, while the contribution rate of soil moisture was only 7.00%. In the dry season, the contribution rate of soil water in the 80-200 cm soil layer reached 64.10%, and the soil water in the 0-60 cm soil layer was partially utilized. It could be seen that a certain rainfall event affects the shallow soil moisture content, but has no significant effect on the deep soil moisture. The water use strategy of Caragana korshinskii in different seasons had a direct relationship with the soil water content in each soil layer. In the rainy season, Caragana korshinskii used rainwater, while in the dry season, Caragana korshinskii mainly used deep soil moisture and also used shallow soil moisture.

Key words: water source, stable isotope, season, Caragana korshinskii, arid sandy area

CLC Number:

S541

WANG Dongqing, XU Hao, MA Lihui, ZHANG Leilei. Study on water use characteristics of Caragana korshinskii in different seasons in arid sandy area of Ningxia[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(10): 2438-2442.

Figures/Tables 3

References 14

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