Abstract：[Background] The arid area of northwest China featuring eco-environment frangibility is one of the areas sensitive to global climate change. Seasonal fluctuations about moisture variations in this area are particularly evident. Moisture, an important environmental factor restricting the growth of desert plants, can affect the metabolism and material synthesis in plants by interfering with the acquisition, transportation, distribution, and storage of elements such as C, N, and P of plants. Hence, focusing on two typical desert plants, Reaumuria soongorica and Salsola passerine, this paper was designed for studying the response of ecological stoichiometric characteristics of desert plant leaves to moisture and differences in element utilization of both plants. Offering basic parameters can verify the response of ecological stoichiometric indicators to precipitation.[Methods] Three sample squares of 50 m×50 m were established on natural communities of R.soongorica and S. passerine at three sampling points selected from Jiuquan, Wuwei, and Jingtai in the Hexi Corridor. Leaves of the three R.soongorica and S.passerine plants randomly selected from each sample square were collected using the harvesting method and put them in an envelope for bringing back to the laboratory. Leaves were first dried in an oven at 105℃ for 30 min, and then at 80℃ to a constant weight, after which the dried samples were crushed for determining C, N and P. Mass fractions of organic carbon, total nitrogen and total phosphorus in the leaves of R.soongorica and S.passerine were determined using potassium dichromate-oxidation heating, kjeldahl determination and vanadium molybdenum yellow colorimetric method together with the calculation of their C/N ratio, C/P ratio and N/P ratio. Excel 2010 and SPSS26.0 were adopted for data analysis, and Excel 2010 for graphing.[Results] With the drought stress increased successively from Jingtai, Wuwei and Jiuquan, C contents in the leaves of R.soongorica and S.passerine increased by 7.64 and 6.69 g/kg, the N content decreased by 0.50 and 1.22 g/kg, the P content decreased by 0.78 and 1.12 g/kg, respectively. Also, C/N, C/P and N/P increased. With consistent moisture conditions, contents of C, P, C/N, and C/P in the leaves of R.soongorica were higher than that of S.passerine, while contents of N and N/P of S.passerine were higher than that of R.soongorica. A strong correlation was observed between the contents of C, N, and P and the contents of C/N and C/P, although there is was no significant correlation among the contents of C, N, and P in the leaves of both plants.[Conclusion] Moisture decrease may accelerate the accumulation of C inthe leaves of R.soongorica and S. passerine. Moreover, R.soongorica in the arid area of northwestern China has a stronger drought tolerance and higher P absorbing capacity, whereas S. passerine possesses the stronger N-fixing ability. These results mayprovide a theoretical basis for protecting and restoring Reaumuria soongorica and Salsola passerine.
王红永, 单立山, 杨洁, 解婷婷, 师亚婷, 马丽, 杨彪生. 降水变化对红砂和珍珠叶片碳氮磷生态化学计量特征的影响[J]. 中国水土保持科学, 2022, 20(1): 48-55.
WANG Hongyong, SHAN Lishan, YANG Jie, XIE Tingting, SHI Yating, MA Li, YANG Biaosheng. Effects of precipitation changes on the carbon, nitrogen and phosphorus ecological stoichiometry of Reaumuria soongorica and Salsola passerine leaves. SSWC, 2022, 20(1): 48-55.
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