香蕉秆及其生物炭对双季水稻土团聚体及碳库管理的影响  

Effects of banana stem and its biochar on soil aggregates and carbon pool management in paddy soil cultivated for double cropping

作　　者：王超 邱竞驰 李建华 卢瑛[1] 李博 唐贤 董玉清 胡家帅 WANG Chao;QIU Jingchi;LI Jianhua;LU Ying;LI Bo;TANG Xian;DONG Yuqing;HU Jiashuai(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China;Land Development and Reclamation Center of Guangdong Province,Guangzhou 510635,China)

机构地区：[1]华南农业大学资源环境学院,广州510642 [2]广东省土地开发整治中心,广州510635

出　　处：《农业环境科学学报》2022年第3期537-546,共10页Journal of Agro-Environment Science

基　　金：NSFC-广东省联合基金集成项目(U1901601);国家科技基础性工作专项重点项目(2014FY110200)。

摘　　要：为探明香蕉秆废弃物资源化利用及其在改善土壤质量方面的可行性,以珠江三角洲区域种植面积广泛的双季水稻土为研究对象,采用室内培养试验,通过测定添加0.5%、1.0%和2.0%香蕉秆及其生物炭后土壤团聚体稳定性和有机碳的变化特征,阐明添加不同比例的香蕉秆及其生物炭对土壤团聚体稳定性、碳库组成和碳库管理的综合影响。结果表明:添加香蕉秆能提高土壤>0.25 mm水稳性团聚体含量和团聚体稳定性系数(ASI),降低土壤团聚体破坏率(PAD)和不稳定团粒指数(ELT);而香蕉秆生物炭处理降低了土壤>0.25 mm水稳性团聚体含量和ASI,增加了PAD和ELT。添加香蕉秆及其生物炭均能不同程度提高土壤总有机碳(TOC)和活性有机碳(EOC)含量,降低土壤氧化稳定系数(Kos),其中香蕉秆处理对EOC的提高更显著,而香蕉秆生物炭处理对TOC的提高更显著。香蕉秆及其生物炭处理分别通过提高碳库活度指数(CPAI)和碳库指数(CPI)来提高土壤碳库管理指数(CPMI)。相关性分析表明,土壤团聚体稳定性主要取决于土壤EOC占比,而非TOC含量。研究表明,添加香蕉秆更有利于土壤结构改善和土壤EOC的积累,2.0%香蕉秆添加比例具有最佳的土壤培肥效果。To investigate the feasibility of utilizing banana stem as a resource to improve quality of double-season rice soil, we selected a wide cultivation area in the Pearl River Delta region as research object. Laboratory culture experiments were conducted to identify changes in soil aggregate stability and organic carbon content after adding 0.5%, 1.0%, and 2.0% banana stem and/or its biochar, and to elucidate the comprehensive effects of adding different proportions of banana straw and its biochar on soil aggregate stability, carbon pool composition, and carbon pool management. Addition of banana stem increased the soil′ s >0.25 mm water-stable aggregate content, and aggregate stability index(ASI), and decreased the percentage of aggregate destruction(PAD)and unstable aggregate index(ELT). Banana stem biochar addition decreased >0.25 mm water-stable aggregates and ASI, and increased PAD and ELT. Addition of banana stem and its biochar increased soil total organic carbon(TOC)and active organic carbon(EOC)content, and decreased the soil carbon oxidation coefficient(Kos). Banana stem most potently increased EOC, and banana stem biochar most potently increased TOC. Soil treatment with banana stem and its biochar improved the soil carbon pool management index(CPMI)by increasing the carbon pool activity index(CPAI)and carbon pool index(CPI), respectively. Correlation analysis showed that soil aggregate stability was more dependent on the proportion in soil of EOC than TOC. Overall, banana stem addition was more beneficial to soil structure and accumulation of soil EOC, and 2.0% banana stem addition exerted the best effect on soil fertility.

关 键 词：香蕉秆 生物炭 土壤团聚体稳定性 碳库管理 双季水稻土 珠江三角洲 

分 类 号：S511.42[农业科学—作物学] S153