文献类型：期刊文献

中文题名：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

英文题名：Response of plant water source of Gobi and desert Ammopiptanthus mongolicus communities to rainfall in Nei Mongol

作者：王阿晴[1] 朱雅娟[1] 马媛[2] 李蕴[1] 肖全[3] 高培刚[3]

第一作者：王阿晴

机构：[1]中国林业科学研究院生态保护与修复研究所荒漠化研究中心,北京100091;[2]中国林业科学研究院沙漠林业实验中心,内蒙古磴口015200;[3]敖伦布拉格镇农牧业综合服务保障中心,内蒙古阿拉善左旗750300

年份：2025

卷号：64

期号：3

起止页码：413-422

中文期刊名：厦门大学学报(自然科学版)

外文期刊名：Journal of Xiamen University:Natural Science

收录：;北大核心:【北大核心2023】；

基金：中国林业科学研究院基本科研业务费项目(CAFYBB2021MA012);科技基础资源调查专项(2023 FY100701-6)。

语种：中文

中文关键词：沙冬青群落;水分来源;稳定同位素;降雨

外文关键词：Ammopiptanthus mongolicus community;water source;stable isotope;rainfall

分类号：Q948.1

摘要：[目的]研究戈壁和沙漠两个沙冬青(Ammopiptanthus mongolicus)群落不同物种水分来源对降雨的响应,以期为气候变化条件下的荒漠植被管理和易危植物保育提供科学依据.[方法]在内蒙古磴口县选择戈壁和沙漠的两个沙冬青群落,分别采集中雨(10.2 mm)和小雨(7.9 mm)的雨水、地下水及雨后第1,3,5和10天的植物、土壤样品.测定样品的稳定氢、氧同位素值,通过MixSIAR模型计算各种植物的水分来源.[结果]中雨后戈壁的沙冬青、柠条锦鸡儿(Caragana korshinskii)和苦豆子(Sophora alopecuroides)竞争中层和深层土壤水,而刺旋花(Convolvulus tragacanthoides)和骆驼蓬(Peganum harmala)主要利用降雨补充的浅层土壤水.小雨后沙漠的沙冬青依赖深层土壤水和地下水,而旱蒿(Artemisia xerophytica)、黑沙蒿(A.ordosica)、砂蓝刺头(Echinops gmelinii)和拐轴鸦葱(Lipschitzia divaricate)均能利用降雨补充的浅层土壤水.[结论]两个沙冬青群落的植物对降雨的响应表现出明显的种间差异.沙冬青一直依赖深层土壤水或地下水,但部分伴生植物利用降雨补充的浅层土壤水.伴生植物对降雨的响应差异有利于戈壁和沙漠沙冬青群落的物种共存.戈壁沙冬青群落不同植物对土壤水的竞争更激烈.因此,建议今后戈壁沙冬青群落保育应注意旱季补充灌溉,减轻深根系伴生植物水分竞争的影响.
[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.Ammopiptanthus 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 35 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.