增温对退化荒漠草原恢复初期物种生态位影响的研究  

Impact of Warming on Species Niche Dynamics in Early-Stage Degraded Desert Grassland Restoration

作　　者：王文琼 张峰[1] 李邵宇 郑佳华 杨立山 张彬[1] 赵萌莉[1] WANG Wenqiong;ZHANG Feng;LI Shaoyu;ZHENG Jiahua;YANG Lishan;ZHANG Bin;ZHAO Mengli(Pratacultural College,Inner Mongolia Agricultural University,Hohhot 010011,China)

机构地区：[1]内蒙古农业大学草业学院,内蒙古呼和浩特010011

出　　处：《中国草地学报》2024年第8期80-87,共8页Chinese Journal of Grassland

基　　金：内蒙古自然科学基金(2020ZD03);内蒙古自治区科技重大专项(2021ZD0044)。

摘　　要：为探讨增温对退化草地恢复过程中植物物种生态位特征的影响,以内蒙古短花针茅(Stipa breviflora)荒漠草原为研究对象,设置自然恢复和增温恢复处理,并以自由放牧区为对照,分析植物种群Shannon-Wiener生态位宽度指数和Pianka生态位重叠指数等。结果表明,与对照相比,自然恢复显著增加了狭叶锦鸡儿(Caragana stenophylla)和银灰旋花(Convolvulus ammannii)重要值;与自然恢复相比,增温恢复显著增加银灰旋花重要值,显著降低无芒隐子草(Cleistogenes songorica)和短花针茅重要值(P<0.05)。与对照相比,自然恢复显著增加短花针茅、狭叶锦鸡儿和银灰旋花生态位宽度(P<0.05);与自然恢复相比,增温恢复显著降低狭叶锦鸡儿和无芒隐子草生态位宽度,显著增加银灰旋花生态位宽度(P<0.05);对比主要物种生态位重叠指数,与对照相比,自然恢复条件下短花针茅与各主要物种生态位重叠指数显著增加(P<0.05),其他物种之间生态位重叠指数无显著差异;与自然恢复相比,增温恢复未显著增加短花针茅与各主要物种生态位重叠指数,但显著增加无芒隐子草、银灰旋花、狭叶锦鸡儿等主要物种间生态位重叠指数(P<0.05)。因此,在荒漠草原增温恢复初期,增温恢复和自然恢复会改变种间关系并有利于扩大优势种生态位宽度和生态位重叠指数。This study investigated the influence of warming on plant species niche dynamics within a recovering desert grassland ecosystem in Inner Mongolia.To achieve this,we compared natural restoration and warming restoration treatments against a free-grazing control.Shannon-Wiener niche breadth index and Pianka niche overlap index were calculated to assess niche characteristics.The results showed that compared to the control,natural restoration led to increase importance values of Caragana stenophylla and Convolvulus ammannii.Warming restoration further enhanced importance value of Convolvulus ammannii while suppressing Cleistogenes songorica and Stipa breviflora(P<0.05).Natural restoration significantly expanded the niche breadth of Stipa breviflora,Caragana stenophylla,and Convolvulus ammannii(P<0.05),whereas warming reduced the niche breadth of Caragana stenophylla and Cleistogenes songorica,and increased the niche breadth of Convolvulus ammannii(P<0.05).Niche overlap analysis revealed that Stipa breviflora exhibited increased niche overlap with other species under natural restoration compared to the control(P<0.05).Warming restoration did not significantly alter the overlap between Stipa breviflora and other species but promoted niche overlap among Cleistogenes songorica,Convolvulus ammannii and Caragana stenophylla(P<0.05).These findings indicate that both natural and warming-induced recovery processes alter species interactions and niche dynamics in early-stage of desert grassland restoration.

关 键 词：增温恢复 自然恢复 生态位 优势种 

分 类 号：S812[农业科学—草业科学]