CAJ | 학술논문

在野外自然条件下采用开顶式生长室模拟增温的方法,研究了增温对川西北高寒草地3种主要植物(单子叶草本植物垂穗披碱草(Elymus nutans)和双子叶草本植物尼泊尔酸模(Rumex acetosa)和鹅绒委陵菜(Potentilla anserina))的生长及物质分配的影响.研究结果表明,增温对3种植物的生长产生了显著影响,垂穗披碱草和尼泊尔酸模的比叶面积和生物量积累在增温后显著增加,而鹅绒委陵菜在增温后显著减少.在各组分中,增温处理使尼泊尔酸模的叶生物量显著增加,根生物量却显著下降,而鹅绒委陵菜叶和茎的生物量在增温后显著减少,根生物量却显著增加.增温对尼泊尔酸模各组分的养分含量产生了显著影响,其中,根部碳含量在增温后显著增加,而氮含量在增温后显著减少.增温对尼泊尔酸模和鹅绒委陵菜的生物量在各组分中的分配产生了显著影响,增温显著增加了尼泊尔酸模的叶重比(LMR)、根重比(RMR)和地下生物量/地上生物量(R/S),而茎重比(SMR)在增温后却显著降低;增温显著增加了鹅绒委陵菜的RMR和R/S,而SMR和LMR在增温后却显著降低.增温对尼泊尔酸模和鹅绒委陵菜各组分中的碳、氮分配产生了显著影响,增温显著增加了碳、氮在尼泊尔酸模叶片的分配比例,并且使尼泊尔酸模根部的碳分配比例也显著增加,而茎部的碳、氮分配比例却显著减少;增温显著减少了碳在鹅绒委陵菜叶片的分配比例,而根部的碳、氮分配比例却显著增加.
재야외자연조건하채용개정식생장실모의증온적방법,연구료증온대천서북고한초지3충주요식물(단자협초본식물수수피감초(Elymus nutans)화쌍자협초본식물니박이산모(Rumex acetosa)화아융위릉채(Potentilla anserina))적생장급물질분배적영향.연구결과표명,증온대3충식물적생장산생료현저영향,수수피감초화니박이산모적비협면적화생물량적루재증온후현저증가,이아융위릉채재증온후현저감소.재각조분중,증온처리사니박이산모적협생물량현저증가,근생물량각현저하강,이아융위릉채협화경적생물량재증온후현저감소,근생물량각현저증가.증온대니박이산모각조분적양분함양산생료현저영향,기중,근부탄함량재증온후현저증가,이담함량재증온후현저감소.증온대니박이산모화아융위릉채적생물량재각조분중적분배산생료현저영향,증온현저증가료니박이산모적협중비(LMR)、근중비(RMR)화지하생물량/지상생물량(R/S),이경중비(SMR)재증온후각현저강저;증온현저증가료아융위릉채적RMR화R/S,이SMR화LMR재증온후각현저강저.증온대니박이산모화아융위릉채각조분중적탄、담분배산생료현저영향,증온현저증가료탄、담재니박이산모협편적분배비례,병차사니박이산모근부적탄분배비례야현저증가,이경부적탄、담분배비례각현저감소;증온현저감소료탄재아융위릉채협편적분배비례,이근부적탄、담분배비례각현저증가.
Aims Plant growth and substance allocation are greatly affected by temperature change, and the response modes have been shown to vary for different functional groups (graminoids and forbs). Our main objective was to assess how experimental warming affects growth in different functional groups and how they adapt to experimental warming by different substance allocation and structural adjustment.Methods We selected three dominant plant species, graminoid Elymus nutans and forbs Rumex acetosa and Po-tentilla anserina, in an alpine meadow in Northwestern Sichuan, and adapted open-top chambers as passive warming devices to generate an artificially warmed environment. After three years of warming, we measured biomass accumulation and substance allocation of the three species.Important findings Compared to the control, experimental warming significantly increased SLA (specific leaf area) and biomass accumulation of E. nutans and R. acetosa and significantly decreased SLA and biomass accu-mulation of P. anserine. Warming significantly increased leaf biomass of R. acetosa, but its root biomass signifi-cantly decreased; however, wanning significantly decreased leaf biomass and stem biomass of P. anserine and its root biomass significantly increased. Wanning significantly increased root C concentration of R. acetosa, but de-creased root N concentration. Warming significantly increased the LMR (leaf mass ratio), RMR (root mass ratio) and R/S (shoot/root biomass ratio) of R. acetosa, but its SMR (stem mass ratio) significantly decreased. For P. an-serina, warming significantly increased its RMR and R/S, but its SMR and LMR significantly decreased. Warming significantly increased C and N allocation in leaves of R. acetosa, and also significantly increased C allocation in its roots, but C and N allocations in its stem were significantly decreased. For P. anserina, wanning significantly decreased C allocation in its leaves, but C and N allocations in its roots were significantly increased.