【摘要】 【目的】研究长期增温对短花针茅荒漠草原3种主要植物——短花针茅(Stipa breviflora)、冷蒿(Artemisia frigida)、木地肤(Kochia prostrata)光合日动态特性的影响,探究荒漠草原植物对增温的响应。【方法】试验采用完全随机裂区设计,样地设增温和不增温(对照)2种处理,采用远红外线辐射器模拟增温处理,并利用便携式光合仪对样地内的短花针茅、冷蒿、木地肤进行光合特性日动态测定。【结果】长期增温处理使短花针茅和木地肤光合特性日动态曲线趋势产生了较小的变化,冷蒿受增温影响相对较大;光合特性日动态平均值对增温的响应趋势存在一定差异,其中,短花针茅响应程度最大,木地肤、冷蒿响应程度较小;增温不同程度地提高了短花针茅、冷蒿、木地肤的光合速率、蒸腾速率,但降低了水分利用效率。【结论】长期增温处理对短花针茅荒漠草原3种主要植物短花针茅、冷蒿、木地肤光合特性影响较小;不同植物对增温的响应存在一定差异,其中,增温对短花针茅光合特性的影响相对较大、冷蒿光合特性日动态曲线对增温的响应相对较为明显。更多还原

【Abstract】 【Objective】To study the effects of long-term warming on the photosynthetic daily dynamics of three main plants in Stipa breviflora desert steppe—Stipa breviflora,Artemisia frigida and Kochia prostrata,and to explore the response of desert steppe plants to warming. 【Methods】 The experiment was conducted in a random split plot design with two treatments:warming and non-warming(control). A far-infrared radiator was used to simulate the warming treatment,and a portable photosynthetic instrument was used to monitor the daily dynamics of photosynthetic characteristics of Stipa breviflora, Artemisia frigida and Kochia prostrata. 【 Results 】 Long-term warming made the daily dynamic curve of photosynthetic characteristics of Stipa breviflora and Kochia prostrata slightly changed,and Artemisia frigida were more affected by warming. There was a certain difference in the response trend of the daily dynamic average of photosynthetic characteristics to warming. Among them,Stipa breviflora had the highest response degree,and Kochia prostrata and Artemisia frigida had a lower response degree. The photosynthetic rate and transpiration rate of Stipa breviflora,Artemisia frigida and Kochia prostrata were increased to varying degree by increasing temperature,but water utilization rate was reduced.【Conclusion】Long-term warming had little effect on the photosynthetic characteristics of the three main plants Stipa breviflora,Artemisia frigida and Kochia prostrata in Stipa breviflora desert steppe. Different plants had different responses to warming. Warming had a relatively large effect on the photosynthetic characteristics of Stipa breviflora. The daily dynamic curve of photosynthetic characteristics of Artemisia frigida had a relatively obvious response to warming.更多还原