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茶渣生物质炭对茶园土壤团聚体及其有机碳分布的影响
肖欣娟,夏建国,于正义,马黛玉,曾雄
四川农业大学资源学院
摘要:
施用生物质炭作为土壤改良技术已受到广泛关注,但对茶园土壤团聚体的影响报道较少且结论不一。本研究将茶生产过程中产生的茶渣在500℃下制成生物质炭,针对雅安名山区三种典型茶园土壤(紫色土、水稻土和黄壤)进行112d的室内培养试验,包括CK、0.5%、1%、2%和4%五种炭土比,共计15个处理,采用湿筛法分析不同生物质炭添加比例下三种茶园土壤水稳性团聚体组成、稳定性和有机碳分布的影响。研究表明:生物质炭输入后三种土壤>0.25mm粒径水稳性大团聚体的数量有所增加,且生物质炭添加比例越高提升越大,其中紫色土中>2mm粒径含量增幅最大,最高提升了12.71%,水稻土和黄壤则是0.25~2mm粒径增幅最大,最高分别提升了8.25%和8.19%。三种土壤的MWD、GMD和R0.25值均有所增加,土壤水稳性团聚体稳定性增加,表现为高添加量下作用更显著,且对黄壤的提升效果最佳。三种土壤各粒径团聚体有机碳的含量大幅提升,且随添加比例的增加而增加,各处理间差异显著(P<0.05),紫色土中<0.053mm粒径的增幅高达96.35%,水稻土中0.053~0.25mm粒径有机碳含量增幅高达74.22%,黄壤中>2mm粒径有机碳含量增幅最高达到334.79%。三种土壤中均是0.25~2mm粒径有机碳相对贡献率最高。总体上,茶渣生物质炭输入后可增加三种茶园土壤的大团聚体数量,提升团聚体稳定性,对各粒径水稳性团聚体有机碳的含量也有显著提升作用(P<0.05)。
关键词:  生物质炭  茶园土壤  土壤团聚体  土壤有机碳
DOI:
分类号:S152.4;S156.2
基金项目:四川农业大学学校建设双支计划(2019)资助。
Effects of tea charcoal biomass carbon on soil aggregates and their organic carbon distribution in tea gardens
XIAO Xinjuan1, XIA Jianguo1, YU Zhengyi2, MA Daiyu3, ZENG Xiong3
1.College of Resources,Sichuan Agricultural University. Chengdu 611130;2.College of Resources,Sichuan Agricultural University;3.College of Resources,Sichuan Agricultural University.
Abstract:
The application of biochar as a soil improvement technology has received widespread attention, however, there are few reports on the effect of soil aggregates on tea plantation soil and the conclusions are mixed. In this study, tea residues produced during the tea production process were made into biochar at 500 ℃. In this study, a 112-day incubation experiment was conducted to study the impact of biochar input on soil aggregate composition, stability and organic carbon contents in three typical tea plantation soils(purple soil, paddy soil, and yellow soil) of Ya"an. The study included five kinds of carbon soil ratio (CK, 0.5%, 1%, 2% and 4%), fifteen treatments in total. Soil aggregates size fractions was examined by wet sieving methods. The results showed that the number of water-stable macro-aggregate in the three soils of> 0.25mm fractions increased after the input of biochar, and increases with the added biochar. Among them, purple soil had the largest increase in > 2mm fractions, with a maximum increase of 12.71%, paddy soil and yellow soil hand the largest increase in 0.25 ~ 2mm fractions, with the maximum increases of 8.25% and 8.19%, respectively. The results revealed that mean weight diameters(MWD), geometric mean diameter(GMD) and macro-aggregate contents(R0.25) were significantly higher under all biochar treatments, indicates that biochar input has improved the stability of soil water-stable aggregates, and the effect is more significant at high additions. The organic carbon content of aggregates of each particle size in the three soils increased significantly, and increased with the added biochar. The differences between treatments were significant (P <0.05). The increase in <0.053mm fractions in purple soil is 96.35%, 0.053~0.25mm fractions in paddy soil increased by 74.22%, and >2mm fractions in yellow soil increased by 334.79%. The relative contribution rate of SOC in 0.25 ~ 2mm fractions was the highest in all three soils. In general, the input of tea charcoal biochar can increase the number of large aggregates in three tea plantation soils, improve the stability of aggregates, and significantly improve the content of organic carbon in water-stable aggregates of various particle sizes (P <0.05).
Key words:  Biochar  Tea plantation soil  Soil aggregates  Soil organic carbon

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