植物响应水分和氮添加的研究进展
摘要:氮和水分是制约干旱半干旱地区植被生长的关键因子。以往研究大多只关注氮沉降或干旱单一因子,有关氮沉降和干旱交互作用对干旱半干旱地区植物的影响还未受到足够的关注。因此,本文通过论述水氮交互对植物生长特征、生理特性、化学计量特征等造成的影响及其机理,在此基础上分析了目前相关研究存在的问题,提出今后应先调查土壤实际氮素类型和比例,再模拟原位土壤中氮素状况对植物生长的影响。而且不同生长阶段的植物对水分和氮的响应是不同的,今后可进一步扩大试验范围及增加植物时间尺度的动态研究,从植物表型结构、解剖结构、地下部分、生理生态、分子生物学等整体角度分析植物对水分和氮沉降变化的响应,以期揭示全球气候变化背景下植物的响应和适应机制。
Abstract:Nitrogen and water are the key factors restricting vegetation growth in arid and semi-arid areas. Most previous studies have focused on single factors such as nitrogen deposition or drought,and the effects of nitrogen deposition and drought interaction on plants in arid and semi-arid regions have not received enough attention. Therefore,this paper reviewed the effects and mechanisms of water and nitrogen interactions on plant growth characteristics,physiological characteristics,and stoichiometric characteristics. On this basis,the existing problems in the current research were analyzed. It is suggested that the actual types and proportions of nitrogen in soil should be investigated in the future. The effects of nitrogen in situ on plant growth were simulated. And plants respond differently to water and nitrogen at different stages of growth,in the future,we can further expand the experimental scope and increase the dynamic study of plant time scale. The responses to changes in water andnitrogen deposition were analyzed from the perspective of plant phenotypic structure,anatomical structure,underground part,physiological ecology and molecular biology. To reveal the response and adaptation mechanism of plants in the context of global climate change.
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