温度与降水协同作用对短花针茅(Stipa breviflora)生物量及其分配的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 温度与降水协同作用对短花针茅生物量及其分配的影响 DOI: 10.5846/stxb201304150710 作者: 作者单位: 中国科学院植物研究所植被与环境变化国家重点实验室,中国科学院植物研究所植被与环境变化国家重点实验室,中国气象科学研究院; 中国科学院植物研究所植被与环境变化国家重点实验室,中国科学院植物研究所植被与环境变化国家重点实验室,中国科学院植物研究所植被与环境变化国家重点实验室,中国科学院植物研究所植被与环境变化国家重点实验室,中国科学院植物研究所植被与环境变化国家重点实验室 作者简介: 通讯作者: 中图分类号: 基金项目: 国家重点基础研究发展计划(973计划) (2010CB951300); 中国科学院战略性先导科技专项-应对气候变化的碳收支认证及相关问题(XDA05050400) Interactive effects of changing precipitation and elevated temperatures on plant biomass and its allocation of Stipa breviflora Author: Affiliation: State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Chinese Academy of Meteorological Sciences; State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用人工气候箱法模拟研究温度变化(对照、增温1.5、2.0、4.0、6.0 ℃)、降水变化(W-30%、W-15%、对照W0、W+15%、W+30%) (以1978-2007年6-8月的月均温和月均降水量为对照)及其协同作用对内蒙古荒漠草原优势种短花针茅生物量及其分配的影响表明:温度和降水协同作用显著影响短花针茅生物量及其分配。增温使短花针茅总生物量、叶和根生物量增加,茎生物量和根冠比分别在在增温1.5 ℃、4 ℃后随增温而减小。干旱高温使总生物量减小,增温和降水增加使总生物量、根和叶生物量增加,茎生物量在增温小于2 ℃时随降水增加而增加,则适当的增温和增加降水可促进短花针茅生物量的积累。短花针茅的各器官生物量分配对温度和降水协同作用的敏感性为茎生物量比>叶生物量比>根生物量比,最敏感性器官为茎。这表明,短花针茅可根据不同器官生物量对水热变化的敏感性,调节干物质累积分配来适应气候变化。 Abstract:Although many studies have studied the effects of single environmental factor (temperature, precipitation, CO2 etc.) on plants, the interactive effects of changing precipitation and temperature on plants, especially of multiple precipitation and temperature regimes have drawn few attention to date. Stipa breviflora, which is one of the dominant species of desert steppe in the arid region, would be highly sensitive to changes of temperature and precipitation. Our objectives of this study are to determine the interactive effects of changing precipitation and elevated temperatures on biomass and its allocation of S. breviflora, and to discover its sensitive organs, in order to provide a reference for the biomass change of S. breviflora in the future climate scenarios and the adaptability of desert steppe to future climate change. In this paper, five artificial control chambers were used to simulate the elevated temperatures (control, T1.5, T2.0, T4.0, T6.0) and changing precipitation (W-30%, W-15%, control W0, W+15% and W+30%) (based on the average monthly temperature and precipitation of 6-8 months during 1978-2007 in Siziwangqi county, Inner Mongolia). There are six replicates for every temperature and precipitation treatment. The seeds were sowed and well watered before control experiment in greenhouse. Then, 150 pots of plants (four plants per pot) with consistent growing vigor were randomly selected and placed into five artificial control chambers as different treatments. Temperature treatments were controlled by artificial control chambers with different daytime and nighttime temperatures, each precipitation treatment was converted to irrigation amounts of every month and then divided into 10 times to water. The biomasses of S. breviflora were measured based on leaves, stems and roots after 3 months. The results showed that the interactive effects of elevated temperature and changing precipitation on biomass and its allocation of S. breviflora were significant. Total biomass, leaf biomass and root biomass increased due to warming, stem biomass and root shoot ratio (R/S) decreased with the increase of temperature when warming was more than 1.5 ℃ and 4 ℃. With the warming of 6 ℃ and decreased precipitation of 30%, total, leaf and root biomasses decreased significantly, but stem biomass and R/S were not affected significantly. With warming and increasing precipitation, total, root and leaf biomasses of S. breviflora increased, stem biomass increased only when warming was less than 2 ℃, so warming and increased precipitation within an appropriate range might promote biomass accumulation. Under interactive effects of warming and changing precipitation, the sensitivity of organ biomass allocation of S. breviflora was ranged as shoot mass ratio (SMR)> leaf mass ratio (LMR)> root mass ratio (RMR), the stem was the most sensitive organ. S. breviflora would adapt to the future climate change by adjusting the biomass allocation into different organs based on its sensitivity. There was difference between the interactive effects of temperature and precipitation and its single effect, therefore we should consider the scene of interactive effects of temperature and precipitation in predicting the adaption of desert grassland plants. 参考文献 相似文献 引证文献