茶渣生物质炭对名山茶园土壤有机碳矿化特征的影响

Effect of Biochar from Tea Residue on the Mineralization of Soil Organic Carbon in Mingshan Tea Garden

【目的】为了揭示茶渣生物质炭对茶园土壤有机碳矿化特征的影响。【方法】以雅安蒙顶山3种典型茶园土壤(紫色土、黄壤和水稻土)为研究对象,将茶渣生物质炭以0%、0.5%、1%、2%和4%5种施用比例加入土壤中,通过112 d室内培养模拟试验,进行一级动力学方程拟合,分析茶渣生物质炭对茶园土壤有机碳含量和矿化特征的影响。【结果】施用茶渣生物质炭显著提高了3种茶园土壤有机碳的含量,其中对黄壤的提升效果最明显;施用茶渣生物质炭显著提高了紫色土和水稻土有机碳的矿化速率、累积矿化量、矿化强度和土壤潜在可矿化有机碳量(C_(0))(P<0.05);茶渣生物质炭对黄壤矿化特征的影响与生物质炭施用比例相关,0.5%施用比下显著降低了黄壤的矿化速率、累积矿化量和土壤潜在可矿化有机碳量(P<0.05),分别较CK处理下降了18.75%、21.88%和22.84%,其余施用比下则呈显著提升作用(P<0.05),但所有生物质炭处理均能显著降低黄壤的矿化强度(P<0.05),且施用量越高降幅越大,降幅范围为39.33%~55.65%。【结论】施用茶渣生物质炭促进了茶园紫色土和水稻土的矿化作用,但施用低量茶渣生物质炭对茶园黄壤的土壤有机碳矿化分解有一定抑制作用,且茶渣生物质炭的施用能显著减弱茶园紫色土和水稻土的固碳能力,同时显著增强茶园黄壤的土壤固碳能力。

[Objective] This paper aims reveal the influence of tea residue biochar on the mineralization of organic carbon in tea garden soil.[Method] Taking three typical tea garden soils(purple soil,yellow soil and paddy soil) in Mengdingshan,Ya’an,as the research object,this study adopted the tea residue biochar at the five application ratios of 0%, 0.5%, 1%,2%, and 4% adding to the soil.Through a 112 d indoor cultivation simulation test, the first-order kinetic equation was fitted to analyze the influence of the tea residue biochar on the organic carbon content and mineralization characteristics of the tea garden soil.[Result] The results showed that the application of tea residue biochar significantly increased the organic carbon content of the three types of tea garden soils, of which the effect on yellow soil was the most obvious.The application of tea residue biochar significantly increased the organic carbon content of purple soil and paddy soil mineralization rate, cumulative mineralization,mineralization intensity and soil potential mineralizable organic carbon(C_(0))(P<0.05).The influence of tea residue biochar on the mineralization characteristics of yellow soil is related to the application ratio of biochar.At 0.5% application ratio, the mineralization rate, cumulative mineralization amount and soil potential mineralizable organic carbon content of yellow soil were significantly reduced(P<0.05).Compared with the CK treatment,it decreased by 18.75%, 21.88% and 22.84%,and the other application ratios showed a significant improvement(P<0.05),but all the biochar treatments could significantly reduce the mineralization intensity of the yellow soil(P<0.05), and the higher the application rate,the greater the decrease, the decrease range is 39.33%~55.65%.[Conclusion] The application of tea residue biochar promotes the mineralization of tea garden purple soil and paddy soil, but the application of low amount of tea residue biochar has a certain inhibitory effect on the mineralization and decomposition of soil organic carbon in the yellow soil of tea garden,and the growth of tea residues.The application of material charcoal can significantly weaken the carbon sequestration capacity of tea garden purple soil and paddy soil, and at the same time significantly enhance the soil carbon sequestration capacity of tea garden yellow soil.