喀斯特适生植物固碳增汇策略

Strategies to increase carbon fixation and sequestration by karst-adaptable plants

通过分析喀斯特地区的土壤化学性质,明确了喀斯特地区植物的固碳增汇的限制因素为岩溶干旱、低营养、高pH、高重碳酸盐等。通过对喀斯特适生植物和非适生植物的无机碳源、氮源的利用以及对低营养的响应差异分析,总结出了喀斯特适生植物交替、高效利用碳酸氢根离子作碳源的开源固碳增汇策略,以较低的营养成本获取较高的光合固碳能力的低成本倍增固碳增汇策略,以及掠夺式吸收限制性的铵态氮和补偿式吸收硝态氮来实现固碳增汇作用的以氮增汇策略等;提出了喀斯特适生植物固碳增汇能力的利用途径,可最大限度挖掘出喀斯特地区植物的固碳增汇潜能。

Based on the analysis on the soil chemical properties in karst area,it is proved the factors that restrict the increasing of carbon fixation and sequestration by the karst-adaptable plants involve karst drought,low nutrient,high pH value and high concentration of bicarbonate.The differences in the use of inorganic carbon and nitrogen as well as in responds to low nutrient by karst-adaptable and karst-inadaptable plants are also analyzed in the paper.The strategies to increase carbon fixation and sequestration by karst-adaptable plants are put forth,which includes the following strategies –efficiently using of bicarbonate source;gaining photosynthetic carbon fixation with low nutrition cost;absorbing restrictive ammonium nitrogen rapaciously and absorbing nitrate nitrogen as compensation.The ways to increase carbon fixation and sequestration by karst-adaptable plants is also proposed,that will maximally excavate the potential of increasing carbon fixation and sequestration by the plants in karst area.