古尔班通古特沙漠降雨过程中梭梭与白梭梭冠层养分的变化特征

doi:10.13866/j.azr.2020.05.22

Abstract

Abstract: Nutrients are relatively scarce in arid regions, and adequate nutrient input after rainwater flows through the canopy is of great significance to the growth and development of plants in arid regions. Through the study ofcanopy nutrients during the rainfall process of Haloxylon ammodendron and H.persicum, which were the maindominant species in the southern margin of the Gurbantunggut Desert, the concentration differences of carbon,nitrogen, and phosphorus in stemflow, throughfall, and rainwater were analyzed, and the concentration degree ofions after rainwater flows through the plant canopy was determined. The results showed that the total organic carbon (TOC) and total nitrogen (TN) concentrations of rainwater increased significantly after passing through the canopy of Haloxylon ammodendron and Haloxylon persicum, and the total phosphorus (TP) did not increase significantly. Thechange of ammonium nitrogen ( NH₄⁺ -N) concentration is basically consistent with that of TN, and the difference between nitrate-nitrogen ( NO₃^- -N) and nitrite-nitrogen ( NO₂^--N) concentrations is not completely significant. Among them, the trunk organic nitrogen (TON) has the highest proportion, and its proportion in TN is always greater than 50%. For the average concentration of different nutrient inputs, in addition to TP and NO₃^- -N, other ions have increased. The concentrations of TP, NO₃^- -N, and NO₂^- -N are lower, and they flow in the stems of stemflow,through fall, and rain. The coefficient of variation is larger in.

Key words: Haloxylon ammodendron, Haloxylon persicum, canopy, ion concentration, Gurbantunggut Desert

YUE Yue-meng, LI Chen-hua, XU Zhu, TANG Li-song. Variation characteristics of canopy nutrients during the rainfall process of Haloxylon ammodendron and Haloxylon persicum in the Gurbantunggut Desert[J].Arid Zone Research, 2020, 37(5): 1293-1300.

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Variation characteristics of canopy nutrients during the rainfall process of Haloxylon ammodendron and Haloxylon persicum in the Gurbantunggut Desert

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