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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

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

摘要:干旱区养分相对匮乏,雨水流经冠层后有效的养分输入对干旱区植物的生长发育意义重大。本文通过对古尔班通古特沙漠南缘主要建群种梭梭(Haloxylon ammodendron)与白梭梭(Haloxylon persicum)降雨过程中冠层养分的研究,分析树干茎流、穿透雨以及雨水中碳、氮、磷的浓度差异,明确雨水流经植物冠层后各离子的变化特征。结果表明,雨水在经过梭梭与白梭梭冠层后总有机碳(TOC)、总氮(TN)浓度增加显著,总磷(TP)增加并不显著。铵态氮(NH4+-N)浓度变化与TN基本一致,硝态氮(NO3--N)、亚硝态氮(NO2--N)浓度差异性不完全显著;其中,树干茎流有机氮(TON)的比例最高,在TN中所占比例始终大于50%。对于不同养分输入的平均浓度,除TP、NO3--N外,其他离子均有所增加;TP、NO3--N、NO2--N浓度较低,在树干茎流、穿透雨以及雨水中的变异系数较大。

英文摘要: " 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 of canopy nutrients during the rainfall process of Haloxylon ammodendron and H.persicum, which were the main dominant 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 of ions 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. The change of ammonium nitrogen ( NH+4 -N) concentration is basically consistent with that of TN, and the difference between nitrate-nitrogen ( NO-3 -N) and nitrite-nitrogen ( NO-2 -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 NO-3 -N, other ions have increased. The concentrations of TP, NO-3 -N, and NO-2 -N are lower, and they flow in the stems of stemflow, throughfall, and rain. The coefficient of variation is larger in.

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[V1] 2020-12-17 16:42:04 chinaXiv:202012.00058V1 下载全文
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