设施鲜秸秆还田条件下土壤特性对碳分解的影响  

Effect of Soil Facilities on the Carbon Decomposition under Fresh Straw Returning Conditions in Greenhouse

作　　者：张敬敏[1] 桑茂鹏 冯棣 彭佃亮[1] 张建新 ZHANG Jing-min;SANG Mao-peng;FENG Di(Weifang University of Science and Technology,Shouguang,Shandong 262700;Jingzhi-Maoteng Agricultural Technology Limited Company in Qushui County,Qushui,Tibet 850600)

机构地区：[1]潍坊科技学院,山东寿光262700 [2]曲水县净植茂藤农业科技有限公司,西藏曲水850600

出　　处：《安徽农业科学》2022年第13期69-71,92,共4页Journal of Anhui Agricultural Sciences

基　　金：山东省重点研发计划“蔬菜秸秆原位全量还田关键技术研究与应用”(2019GSF109113);西藏自治区自然科学基金重点项目“设施土壤生态利用技术模式研究与应用”(XZ202001ZR0067G)。

摘　　要：[目的]探索设施栽培条件下鲜秸秆还田技术,明确土壤特性对还田鲜秸秆分解的影响。[方法]在PCS液体培养基中分别加入4种不同设施土壤(LC1、LC2、DT1和DT2)和等量番茄鲜秸秆,研究设施土壤特性因子对有机碳分解率的影响。[结果]4种设施土壤,LC1土壤全盐和真菌最高,pH最低,碳分解率91.39%;LC2土壤有机质最高、全盐最低,碳分解率为87.91%;DT1和DT2土壤细菌较高,真菌数量较低,碳分解率分别为91.26%和92.45%,碳分解率LC1、DT1和DT2间无显著差异,显著高于LC2。相关分析表明,土壤有机质与碳分解率呈极显著负相关,pH、全盐、细菌和真菌均与碳分解率相关性不显著。偏相关分析表明,碳分解率与pH、全盐和真菌的偏相关系数达显著水平。通径分析表明,土壤有机质主要通过土壤全盐和真菌对碳分解率起作用,全盐对碳分解率起正向决定作用,真菌对碳分解率起负向决定作用。[结论]土壤全盐和真菌是影响碳分解率的重要因素。[Objective]To explore fresh straw returning technology in greenhouse and define the effect of soil facilities on straw decomposition.[Method]Adding four different greenhouse soil(LC1,LC2,DT1 and DT2)and equal amount of tomato fresh straw in PCS fluid medium,the relationship between soil facilities and the carbon decomposing rate(CDR)was studied.[Result]Among the four greenhouse soil,LC1 had the highest total salt and fungi quantity,lowest pH,and its CDR was 91.39%;LC2 had the highest organic matter and lowest total salt,its CDR was 87.91%;DT1 and DT2 had the higher bacterial quantity and lower fungi quantity,its CDR were 91.26%and 92.45%respectively.There was no significant difference in the carbon decomposition rate among LC1,DT1 and DT2,and was significantly higher than that of LC2.The correlation analysis showed that only the soil organic matter was significantly negatively correlated with CDR.pH,total salt and bacterial and fungi quantity were no correlation with CDR.Partial correlation analysis showed the biased correlation coefficient between CDR and pH,total salt and fungi quantity reached significant level.Path analysis showed that the soil organic matter had effect on CDR through the soil total salt and fungi quantity,the soil total had a positive decisive role on CDR,the fungi quantity had negatively decisive role on CDR.[Conclusion]The soil total salt and fungi quantity are the key factors on CDR.

关 键 词：鲜秸秆 秸秆还田 土壤特性 碳分解 

分 类 号：S157.4[农业科学—土壤学]