功能性状调控高寒克隆植物繁殖策略对增温和降温的响应OA
Functional traits regulate the reproductive strategy of alpine clonal plants in response to warming and cool-ing
垂穗披碱草(Elymus nutans)和异针茅(Stipa aliena)是青藏高原高寒草地典型的克隆植物,其繁殖策略受气候变化的直接或间接影响,进而改变植物的繁殖成效和适合度.然而,不同时间尺度的增温和降温如何影响繁殖策略,以及功能性状在其中的调控作用尚不清楚.本研究基于3个海拔(3200、3400、3800 m)设立的山体垂直带双向移栽实验平台和同质园实验,研究了这两种植物在短期和长期温度变化下繁殖属性及地上和地下功能性状响应.结果表明:(1)短期增温增加了异针茅的生殖枝数,但两物种生殖枝数与营养枝数的比值仅在长期处理下发生显著变化,体现了繁殖策略的时间滞后效应.(2)长期增温下,垂穗披碱草和异针茅的生殖枝与营养枝比值在海拔3200～3400 m范围内,随海拔每降低100 m分别显著降低54.5％(P=0.001)和增加98.4％(P＜0.001).长期降温下,该比值在垂穗披碱草(3200～3800 m)和异针茅(3200～3400 m)中,随海拔每升高100 m分别显著降低21.6％(P=0.038)和58.3％(P=0.013).(3)长期增温降低了垂穗披碱草的比根长,增加了克隆繁殖比例;异针茅的植株高度增加,有性繁殖比例上升.长期降温则显著降低异针茅的植株高度和有性繁殖比例.综上,垂穗披碱草在长期增温和降温下均倾向于增加克隆繁殖比例,而异针茅在长期增温下增加有性繁殖比例,长期降温下则减少有性繁殖比例.本研究揭示了地上和地下功能性状在繁殖策略调控中的关键作用,有助于理解高寒克隆植物应对气候变化的适应策略,为青藏高原草地生物多样性保护与生态系统适应性管理提供理论依据.
Elymus nutans and Stipa aliena are typical clonal plants in the alpine grasslands of the Qinghai-Tibet Plateau.Reproductive strategies of both species are influenced by climate change,which in turn affects reproductive success and overall fitness.However,how these strategies respond to temperature changes over different temporal scales,as well as the role of functional traits in regulating these strategies,remain unclear.Based on reciprocal transplant and common garden experiments conducted at three elevations(3200,3400,and 3800 m)along a mountain slope,we investigated the reproductive traits and the responses of aboveground and belowground function-al traits in these two species to short-term and long-term temperature changes.The results showed that:(1)Al-though short-term warming increased the number of reproductive branches of S.aliena,the ratio of reproductive to vegetative branches in both species significantly changed only under long-term treatments,indicating a delayed re-sponse in reproductive strategy.(2)Under long-term warming,for every 100 m decrease in elevation within the range of 3200 m to 3400 m,the ratio of reproductive to vegetative branches of E.nutans decreased by 54.5％(P=0.001),while that of S.aliena increased by 98.4％(P＜0.001).Under long-term cooling,for every 100 m increase in elevation,the ratio of reproductive to vegetative branches of E.nutans decreased by 21.6％(P=0.038)within the range of 3200 m to 3800 m,and that of S.aliena decreased by 58.3％(P=0.013)within the range of 3200 m to 3400 m.(3)Long-term warming decreased specific root length of E.nutans,accompanied by an in-crease in clonal reproduction.The increased plant height of S.aliena was associated with a higher proportion of sex-ual reproduction.Long-term cooling significantly reduced the height of S.aliena,accompanied by a decrease in sex-ual reproduction.In conclusion,E.nutans tends to increase clonal reproduction under both long-term warming and cooling,while S.aliena increases sexual reproduction under long-term warming but decreases sexual reproduction under long-term cooling.This study underscores the critical role of both aboveground and belowground functional traits in shaping reproductive strategies,offering valuable insights into the adaptation of alpine clonal plants to cli-mate change.Additionally,it provides theoretical support for biodiversity conservation and the adaptive ecosystem management in the alpine grasslands of the Tibetan Plateau.
魏瑶;李宇章;谭天元;张振华
中国科学院西北高原生物研究所,青海海北高寒草地生态系统国家野外科学观测研究站,西宁 810008||中国科学院大学,北京 100049中国科学院西北高原生物研究所,青海海北高寒草地生态系统国家野外科学观测研究站,西宁 810008||中国科学院大学,北京 100049兰州大学草地农业科技学院,兰州大学草种创新与草地农业生态系统全国重点实验室,兰州 730000中国科学院西北高原生物研究所,青海海北高寒草地生态系统国家野外科学观测研究站,西宁 810008||中国科学院大学,北京 100049
青藏高原繁殖分配有性繁殖克隆繁殖
Qinghai-Tibet Plateaureproductive allocationsexual reproductionclonal reproduction
《生态学杂志》 2026 (5)
1417-1426,10
中国科学院西部之光-重点实验室专项·交叉团队项目(xbzg-zdsys-202203)和国家自然科学基金项目(31971467)资助.
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