小麦秸秆植硅体碳增汇潜力研究  

Potential Study of Phytolith Carbon Sink Increase in Wheat Straw

作　　者：董彬[1] 石佳妍 杨天明 史舒琪 王泽宇 冯少娣 尉海东[1] Dong Bin;Shi Jiayan;Yang Tianming;Shi Shuqi;Wang Zeyu;Feng Shaodi;Wei Haidong(Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection,College of Resources and Environment,Linyi University,Linyi,Shandong 276000,China)

机构地区：[1]山东省水土保持与环境保育重点实验室,临沂大学资源环境学院,山东临沂276000

出　　处：《绿色科技》2022年第22期45-50,共6页Journal of Green Science and Technology

基　　金：引进人才科研启动基金(编号:LYDX2016BS074);大学生创新创业训练计划(编号:X202110452232)。

摘　　要：植硅体碳(PhytOC)是土壤碳稳定存在的一种重要形式,对生态系统长期碳增汇具有重要意义。为精确评价小麦秸秆植硅体碳增汇潜力,以山东省临沂市典型农作物小麦为研究对象,采用微波消解法提取小麦秸秆植硅体,用元素分析仪分析了小麦秸秆植硅体有机碳含量。结果表明:小麦秸秆植硅体含量和秸秆植硅体碳含量分别为19.86~37.78 g/kg和1.38~1.70g/kg;小麦秸秆PhytOC储量、碳封存潜力、碳增汇潜力分别为8.30~12.18 kgC/hm^(2)、31.89~44.65 kgCO_(2)/hm^(2)、0.17~2.01 t CO_(2)/a,南部平原地区高于北部山地丘陵地区,土壤养分是影响小麦秸秆植硅体碳封存的重要因素。据估算,1984~2020年,随着小麦单产量的提高,临沂市小麦秸秆植硅体碳封存潜力明显升高(15.75~41.14 kg CO_(2)/hm^(2)),小麦秸秆植硅体碳增汇潜力明显增加(7.05~14.43 t CO_(2)/a),36年临沂市总计固定411.52 t CO_(2),小麦秸秆植硅体碳汇效应显著。研究结果可为区域小麦碳增汇的精确评价提供科学依据。Phytolith-occluded carbon(PhytOC)is an important form for soil carbon stabilization,which plays great significance to long-term carbon sink in ecosystems.In order to accurately evaluate the potential of phytolith carbon sink increase of wheat straw,the study conducted the chief crop-wheat in Linyi City of Shandong Province.The wheat straw phytolith was extracted by microwave digestion method,and the PhytOC of wheat straw was analyzed with elemental analyzer.The results showed that the contents of phytolith and PhytOC in wheat straw were 19.86~37.78 g/kg,1.38~1.70 g/kg,respectively.The PhytOC storage,carbon sequestration potential and phytolith carbon sink potential of wheat straw was 8.30~12.18 kgC/hm^(2),31.89~44.65 kgCO_(2)/hm^(2),0.17~2.01 t CO_(2)/a,respectively,and they were higher in the southern plains than that of the northern hilly areas.Soil nutrients are the key factors affecting carbon sequestration in wheat straw PhytOC.It was estimated that with the increase of wheat yield per unit from 1984 to 2020,the carbon sequestration potential of wheat straw in Linyi City was significantly higher(15.75~41.14 kg CO_(2)/hm^(2)).The phytolith carbon sink potential of wheat straw phytolith increased significantly(7.05~14.43 t CO_(2)/a).A total of 411.52 t CO_(2) was fixed in Linyi City in 36 years,and the carbon sink effect of wheat straw phytolith was significant.The results can provide scientific basis for the accurate evaluation of regional wheat straw phytolith carbon sink.

关 键 词：小麦 植硅体碳 碳封存 植硅体碳汇 碳增汇 

分 类 号：X511[环境科学与工程—环境工程]