厦门大学学报（自然科学版）2025，Vol.64Issue(3)：413-422,10.DOI:10.6043/j.issn.0438-0479.202410025
内蒙古戈壁和沙漠沙冬青群落植物水分来源对降雨的响应
Response of plant water source of Gobi and desert Ammopiptanthus mongolicus communities to rainfall in Nei Mongol
摘要
Abstract
[Objective]Water is a key limiting factor for the survival and growth of desert plants.Rainfall is one of the main water sources in desert ecosystem,and the water sources of desert plants can be temporarily disturbed by rainfall.A mmopiptanthus mongolicus is the dominant plant in desert steppe and steppe desert in Nei Mongol.It is extremely resistant to heat and drought,and plays an important role in wind prevention and sand fixation.Understanding the response of A.mongolicus to rainfall in different communities will provide a scientific support for desert vegetation management and the conservation of vulnerable species under climate change.This study aimed to address how different plant water source respond to rainfall in Gobi and desert A.mongolicus communities.[Methods]Two A.mongolicus communities were selected,one in Gobi and the other in desert of Dengkou County.In the Gobi A.mongolicus community,the companion species included the shrub Caragana korshinskii,Convolvulus tragacanthoides,and the herb Peganum harmala and Sophora alopecuroides.In the desert A.mongolicus community,companion species included the shrub Artemisia xerophytica and A.ordosica,and the herb Echinops gmelinii and Lipschitzia divaricate.The main soil types were brown desert soil and aeolian soil in two communities,respectively.Rainwater was collected using a rain gauge immediately after rainfall.Groundwater,plants,and soil samples were collected from both communities on the 1st,3rd,5th and 10th days following 10.2 mm(moderate rain)and 7.9 mm(light rain)of rainfall in July 2023,respectively.Four healthy plants of similar size were selected from each shrub,and two-year-old twigs were sampled using scissors.Twigs with a length of 5 cm and diameter of 3-5 mm were clipped,the bark was removed,and the xylem was placed into 8 mL glass vials.The junction of root and stem was collected for each herb.Soil samples in the Gobi community were collected by digging a profile with a shovel at depths of 10,25,50,100,and 150 cm.Soil samples in desert were collected at depths of 10,25,50,100,150 and 200 cm using an AMS soil auger.Groundwater samples were collected from a well located about 500 m from the desert site.Water in soil and plant samples was vacuum extracted using a LI-2000 Water Vacuum Extract System.The stable hydrogen and oxygen isotope values of all water samples were measured using a LWIA-912 Liquid Water Isotope Analyzer.Water sources of each plant at different periods after rainfall were analyzed using the MixSIAR model.[Results]In the Gobi A.mongolicus community,A.mongolicus,C.korshinskii and S.alopecuroides mainly utilized middle and deep soil water after moderate rainfall,indicating water competition among the three plants.In contrast,C.tragacanthoides and P.harmala relied on shallow soil water recharged by rainfall.In the desert A.mongolicus community,A.mongolicus mainly utilized deep soil water and groundwater after light rain,whereas A.xerophytica,A.ordosica,E.gmelinii and L.divaricate used shallow soil water recharged by rainfall at various times after light rain.[Conclusion]In the two A.mongolicus communities,there were significantly inter-specific differences in plant water source responses to rainfall.A.mongolicus consistently relied on deep soil water or groundwater,while some companion plants used shallow soil water recharged by rainfall.These difference in water use strategies promoted species coexistence of A.mongolicus communities in both Gobi and desert.However,the competition for soil water was more intensive among species in the Gobi A.mongolicus community.Thus,it suggests that irrigation should be considered during drought periods to reduce water competition from deep-rooted companion plants,thereby supporting the conservation of Gobi A.mongolicus community in the future.关键词
沙冬青群落/水分来源/稳定同位素/降雨Key words
Ammopiptanthus mongolicus community/water source/stable isotope/rainfall分类
生物学引用本文复制引用
王阿晴,朱雅娟,马媛,李蕴,肖全,高培刚..内蒙古戈壁和沙漠沙冬青群落植物水分来源对降雨的响应[J].厦门大学学报（自然科学版）,2025,64(3):413-422,10.基金项目
中国林业科学研究院基本科研业务费项目(CAFYBB2021MA012) （CAFYBB2021MA012）
科技基础资源调查专项(2023 FY100701-6) （2023 FY100701-6）
