贝加尔针茅响应降水变化敏感指标及关键阈值

发布时间：2018-11-17 12:12

【摘要】：降水是影响中国北方草原群落结构和生产力的关键环境因子,弄清植物响应降水变化敏感指标,确定关键阈值,可为草原的科学管理与制定应对气候变化措施提供依据。以贝加尔针茅为材料,基于不同降水的模拟实验,采用正态总体统计容忍区间及容忍限的估算方法,对测定的叶面积、株高、叶绿素和叶N含量等14个植物生理生态指标响应降水变化的敏感性及其阈值进行了研究。结果表明,植株总叶面积、水势(或叶绿素含量)和地上生物量可分别从形态、生理和生物量积累三方面较好地指示贝加尔针茅对降水变化的敏感性,受到胁迫时的降水量(6、7和8月3个月份总降水量)阈值分别是283、276(276)mm和280 mm。研究结果可为客观辨识贝加尔针茅草原干旱的发生发展与监测预警提供参考。
[Abstract]:Precipitation is a key environmental factor affecting the structure and productivity of grassland community in northern China. Understanding the sensitive index of plant response to precipitation and determining the key threshold can provide the basis for the scientific management of steppe and the formulation of measures to deal with climate change. Based on the simulated experiments of different precipitation, the leaf area and plant height of Stipa baicalensis were estimated by normal population statistical tolerance interval and tolerance limit. The sensitivity and threshold of 14 plant physiological and ecological indexes, such as chlorophyll and leaf N content, in response to precipitation changes were studied. The results showed that the total leaf area, water potential (or chlorophyll content) and aboveground biomass could indicate the sensitivity of Stipa baicalensis to precipitation change from three aspects: morphology, physiology and biomass accumulation. The threshold of precipitation (total precipitation in July and August) under stress was 283276 (276) mm and 280 mm., respectively. The results can provide a reference for the objective identification of drought occurrence and development and monitoring and early warning of Needarpa baicalensis.
【作者单位】：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;
【基金】：公益性行业(气象)科研专项(重大专项)(GYHY201506001-3) 国家重点基础研究发展计划(973计划)(2010CB951301)
【分类号】：S812

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