植物粟对模拟封存CO2泄漏的生理响应

Physiological Response of Plant Millet to Simulated Carbon Capture and Storage of CO2 Leakage

碳捕集与封存(Carbon Capture and Storage,CCS)技术是近年来迅速发展的温室气体减排措施,是以煤为主的中国重要的战略性减排技术之一,减排量巨大。但是,CCS发展备受争议,其泄漏有可能会对周围生态系统尤其是结构单一的农田生态系统造成严重影响。本研究以北方地区主要粮食作物粟为试验对象,自主设计模拟地质封存CO2泄漏盆栽试验,通过对植物生育期SPAD(叶绿素相对含量)、株高、根系以及产量、穗部特征等指标的观测,分析粟对CCS泄漏的响应。结果表明:(1)受CCS泄漏的影响,植物粟SPAD值显著降低,植株叶片叶绿素含量极显著下降(P<0.01)。(2)CCS泄漏发生30d后粟的株高显著下降,根分支显著增加,植株受泄漏影响明显。(3)CCS泄漏显著降低了植株地上部干重和鲜重,但是泄漏对地下部鲜重无显著影响,地下部干重较地上部降幅偏小。(4)CCS泄漏影响下,植株粟产量下降34.92%。此外,CCS泄漏下植株穗长、穗粗、总粒重等农艺性状下降显著。

Carbon capture and storage(CCS) technology is one of the key strategic emission reduction technologies,which made a great contribution towards emission reductions. However, there still exists controversy of CCS largely due to the safety problems caused by its leakage. Leakage of CO2 captured in geological structures has a threat to the cultivated crops on the ecosystem suroundings. Thus it has great significance to carry out CCS leakage assessment on crops. In this study, the millet crop, which is the main grain in the northern region, was used as experimental object. Effects of CCS leakage on the physiological characteristics of millet were studied through a self-designed pots experiment simulation CO2 leakage by analyzing the SPAD, plant height, panicle diameter, panicle length, plant biomass and yield of the millet plant. The results showed that CO2 leakage into shallow soil caused the decrease significantly for leaf green value(SPAD), fresh weight in the shoot, dry weight in the ground and the weight of the grain ear, which proved that the CO2 leakage of the storage had a serious negative impact on the physiology and yield of the millet, and the yield of millet decreased by 34.92%. It was also observed that the number of branches of root increased by 10%, and the depth of the root burial became shallower. It indicated that the number of the millet roots has response for CO2 leakage. Meanwhile, the weight per panicle, the panicle diameter was coarse and the panicle length changed significantly.