内蒙古荒漠草原沙生针茅(Stipa glareosa)、碱韭(Allium polyrhizum)和骆驼蓬(Peganum harmala)叶形态性状对土壤水氮耦合的响应  

Responses of leaf morphological traits of three dominant plants to water and nitrogen in desert steppe of Inner Mongolia

作　　者：郭新新 左小安 岳平 李香云 赵生龙 吕朋 胡亚 Guo Xinxin;Zuo Xiaoan;Yue Ping;Li Xiangyun;Zhao Shenglong;Lv Peng;Hu Ya(Urat Desert-Grassland Research Station/Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西北生态环境资源研究院乌拉特荒漠草原研究站/奈曼沙漠化研究站,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《中国沙漠》2021年第1期137-144,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(41622103,41571106);中国科学院青年创新促进会项目(1100000036)。

摘　　要：研究降水和氮沉降对荒漠草原植物叶形态性状的影响,对于预测未来全球变化下荒漠草原植物的生态适应具有重要意义。对增减雨(±50%)和氮添加(10 g·m^(-2)·a^(-1))及其交互作用对乌拉特荒漠草原区优势植物叶形态性状的影响研究结果表明:(1)沙生针茅(Stipa glareosa)、碱韭(Allium polyrhizum)和骆驼蓬(Peganum harmala)比叶面积(SLA)、叶干物质含量(LDMC)对增减雨和氮添加的响应存在差异。增雨处理下仅碱韭的SLA显著降低,减雨处理下骆驼蓬的SLA显著降低,LDMC显著增加(P<0.05);氮添加处理下仅骆驼蓬的LDMC显著降低(P<0.05)。(2)水氮交互作用仅对骆驼蓬有显著影响(P<0.05),氮添加使减雨处理对其SLA和LDMC无显著影响(P>0.05)。(3)减雨、氮添加和增雨与氮添加的交互作用处理下SLA和LDMC显著负相关(P<0.05)。沙生针茅叶性状较稳定,碱韭SLA对增雨响应较敏感,骆驼蓬叶性状对减雨敏感,而增氮可降低减雨对其叶片的胁迫,荒漠草原区不同的植物通过不同的可塑性和生态策略响应和适应区域环境变化。It’s great important to study the effects of precipitation and nitrogen deposition on leaf morphological traits in desert steppe plants,which will predict the ecological adaptation of desert steppe plants under global changes.In this experiment,the effects of increasing and decreasing precipitation(±50%),nitrogen addition(10 g·m^(-2)·yr^(-1))and their interactions on leaf morphological traits of different dominant species were studied in desert steppe.The results showed that:different responses of the specific leaf area(SLA)and leaf dry matter content(LDMC)of the three plants(Stipa glareosa,Allium polyrhizum and Peganum harmala)were found to increasing or decreasing precipitation and nitrogen addition.(1)The SLA of A.polyrhizum was significantly reduced under the increasing precipitation(P<0.05).And the SLA of P.harmala was decreased significantly by decreasing precipitation(P<0.05).However,the LDMC was increased significantly by decreasing precipitation.Only the LDMC of P.harmala has a significant decrease under nitrogen addition(P<0.05).(2)A significant effect on P.harmala was observed by the interaction of water and nitrogen(P<0.05).Furthermore,nitrogen addition could change the effect of decreasing precipitation on the leaf morphological traits of A.polyrhizum.(3)It’s a significant negative correlation between SLA and LDMC under decreasing precipitation,nitrogen addition and the interaction of increasing precipitation and nitrogen addition(P<0.05).The leaf characters of S.glareosa were relatively stable.The SLA of A.polyrhizum was sensitive to the response of increasing precipitation.The leaf morphological traits of P.harmala were sensitive to decreasing precipitation,while nitrogen addition can reduce the stress of decreasing precipitation on them.Adaptions and responses of different plants in desert steppe to regional environmental changes were mediated by different ecological strategies and plasticity.

关 键 词：荒漠草原 增减雨 氮添加 比叶面积 叶干物质含量 

分 类 号：Q948.11[生物学—植物学]