戈壁沙冬青(Ammopiptanthus mongolicus)群落水分来源的年际动态  

Inter-annual variation of water source of Ammopiptanthus mongolicus community on gobi

作　　者：王阿晴 朱雅娟[1] 马媛 蔺方春 李蕴[1] Wang Aqing;Zhu Yajuan;Ma Yuan;Lin Fangchun;Li Yun(Research Center of Desertification Studies,Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China;Experimental Center of Desert Forestry,Chinese Academy of Forestry,Dengkou 015200,Inner Mongolia,China)

机构地区：[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,内蒙古磴口县015200

出　　处：《中国沙漠》2025年第1期85-93,共9页Journal of Desert Research

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(2023FY100701-6)。

摘　　要：连续两年生长季在狼山南麓戈壁采集沙冬青(Ammopiptanthus mongolicus)群落的灌木枝条和土壤,利用稳定氧同位素技术研究群落水分来源的年际动态。结果表明:2021年,春季大雨后沙冬青、泡泡刺(Nitraria sphaerocarpa)、刺旋花(Convolvulus tragacanthoides)主要利用浅层和深层土壤水。干旱的夏季前两者主要利用深层土壤水,后者主要利用浅层和深层土壤水。秋季3种灌木增加利用浅层土壤水。2022年,干旱的春秋季沙冬青和柠条锦鸡儿(Caragana korshinskii)主要利用深层土壤水。夏季大雨后沙冬青、柠条锦鸡儿、刺旋花主要利用浅层和深层土壤水。刺旋花春季主要利用浅层和深层土壤水,秋季主要利用深层土壤水。2021年降雨量较低,沙冬青利用较多深层土壤水。2022年降雨量较高,刺旋花利用更多浅层土壤水。泡泡刺和柠条锦鸡儿均与沙冬青竞争深层土壤水。戈壁沙冬青群落的水分来源存在年际差异和种间竞争。In southern piedmont of Langshan Mountain,shrub branch and soil of gobi Ammopiptanthus mongol-icus community were collected in the growing season of two years,analyzed by stable oxygen isotope to clarify the inter-annual dynamics of water sources.The results showed that:In 2021,A.mongolicus,Nitraria sphaero-carpa and Convolvulus tragacanthoides mainly used shallow and deep soil water after heavy rain in spring.Dur-ing the drought event within summer,the first two shrubs mainly used deep soil water,whereas the latter shrub mainly used shallow and deep soil water.Three shrubs increasingly used shallow soil water in autumn.In 2022,A.mongolicus and Caragana korshinski mainly used deep soil water in drought spring and autumn.Three shrubs mainly used shallow and deep soil water after heavy rain in summer.C.tragacanthoides mainly used shallow and deep soil water in spring,but it mainly used deep soil water in autumn.There was less rainfall in the growing sea-sons in 2021,A.mongolicus used more deep soil water.However,there was more rainfall in 2022,C.tragacan-thoides used more shallow soil water.Both of N.sphaerocarpa and C.korshinskii competed deep soil water with A.mongolicus.Thus,there was inter-annual variation and inter-specific competition of water source in gobi A.mongolicus community.

关 键 词：戈壁 沙冬青(Ammopiptanthus mongolicus)群落 水分来源 稳定氧同位素 

分 类 号：Q948.1[生物学—植物学]