广西植物2023，Vol.43Issue(12)：2256-2268,13.DOI:10.11931/guihaia.gxzw202210002
两种豆科植物及各器官对不同形态氮的吸收、分配研究
Absorption and distribution of different forms of nitrogen in two legumes and organs
摘要
Abstract
Legumes are abundant in the nitrogen deficient desert ecosystems,which is the center of supplying available nitrogen and the important pioneer species in this region.However,the studies on nitrogen uptake and utilization by legumes in desert ecosystems have rarely been reported so far.In this study Astragalus flexus and A.arpilobus,which are widely distributed in the Gurbantunggut Desert,were selected as the research objects.Three different nitrogen forms(15N-NH4+,15N-NO3-,15N-glycine)were added to 0-5 cm and 5-15 cm soil layers,respectively,to study the absorption and distribution strategies of different forms of nitrogen in two plants and their organs.The results were as follows:(1)In different soil layers,both plants preferred to absorb nitrate nitrogen,and the maximum absorption rates of A.flexus and A.arpilobus were 3.26,2.59 μg·g-1·h-1,respectively.(2)In different soil layers,there were significant differences in the uptake and allocation of different nitrogen sources among plant organs(P<0.05).The uptake of 15 N in root of A.flexus was higher than that of A.arpilobus,and the three different nitrogen forms were mainly allocated to leaves.(3)In different soil layers,the contribution rates of different nitrogen sources to both plants were 15N-NO3->15N-glycine>15N-NH4+,and the contribution rates of nitrate nitrogen to nitrogen absorption of A.flexus ranged from 37%to 41%,while the maximum contribution rate to the nitrogen absorption of A.arpilobus was 45%.(4)There were significant differences in recovery rates of different nitrogen forms between different organs of plants(P<0.05).In the 0-5 cm soil layer,the recovery rate of nitrate nitrogen was leaf>stem>root,while in the 5-15 cm soil layer,the rate was leaf>root>stem.In general,in the Gurbantunggut Desert ecosystem,different life forms legumes had both consistency and difference in nitrogen uptake and allocation capacity,and were affected by different soil depths and nitrogen forms.The results provide theoretical basis for nitrogen uptake,utilization and allocation of legumes in arid and semi-arid regions of Xinjiang.关键词
豆科植物/植物器官/15N同位素标记/氮素吸收/古尔班通古特沙漠Key words
legumes/plant organ/isotopic labeling/nitrogen uptake/Gurbantunggut Desert分类
农业科技引用本文复制引用
依里帆·艾克拜尔江,李进,庄伟伟..两种豆科植物及各器官对不同形态氮的吸收、分配研究[J].广西植物,2023,43(12):2256-2268,13.基金项目
新疆维吾尔自治区自然科学基金面上项目(2021D01A123) （2021D01A123）
新疆维吾尔自治区重点实验室开放课题(2021D04003) （2021D04003）
国家自然科学基金(42007092) （42007092）
新疆特殊环境物种多样性应用与调控重点实验室开放课题(XJTSWZ-2022-02). （XJTSWZ-2022-02）
