Solar vegetable greenhouse soils show low soil organic carbon content and thus also low rates of soil respiration. Processing vegetable residues to biochar and mixing biochar with maize straw might improve soil respiration and increase soil organic carbon stocks, while preventing the spread of soil‐borne diseases carried by vegetable residues. In an incubation experiment, we tested how additions of maize straw (S) and biochar (B) added in varying ratios (100S, 75S25B, 50S50B, 25S75B, 100B and 0S0B (control)) affect soil respiration and fraction of added C remaining in soil. Daily CO₂ emissions were measured over 60 days incubation, the natural abundance of ¹³C in soil and in the added biochar and maize straw were analysed. Our result shows that (a) soil CO₂ emissions were significantly increased compared to soil without the straw additions, while addition of biochar only decreased soil respiration; (b) cumulative CO₂ emissions decreased with increasing ratio of added biochar to maize straw; (c) the abundance of soil ¹³C was significant positively correlated with cumulative CO₂ emissions, and thus with the ratio of straw addition. Our results indicate that incorporation of maize straw in greenhouse soils is a meaningful measure to increase soil respiration and to facilitate greenhouse atmosphere CO₂ limitation while producing vegetables. On the other hand, additions of biochar from vegetable residues will increase soil organic carbon concentration. Therefore, the simultaneous application of maize straw and biochar obtained from vegetable residues is an effective option to maintain essential soil functions for vegetable production in sunken solar greenhouses.

中文翻译：

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秸秆和生物炭混合秸秆的应用可以满足植物对二氧化碳的需求，并可以在沉没的日光温室蔬菜生产中增加土壤碳储量

日光温室蔬菜土壤的有机碳含量较低，因此土壤呼吸速率也较低。将植物残渣加工成生物炭并将生物炭与玉米秸秆混合可以改善土壤呼吸并增加土壤有机碳储量，同时防止由蔬菜残渣携带的土传疾病的传播。在孵化实验中，我们测试了以不同比例（100S，75S25B​​，50S50B，25S75B，100B和0S0B（对照））添加的玉米秸秆（S）和生物炭（B）如何影响土壤呼吸和土壤中残留的添加碳的比例泥。在培养60天后测量每日的CO ₂排放量，分析土壤中以及添加的生物炭和玉米秸秆中¹³ C的自然丰度。我们的结果表明：（a）土壤CO ₂与不添加秸秆的土壤相比，排放量显着增加，而添加生物炭只会降低土壤呼吸；（b）累积的CO ₂排放量随着添加的生物炭与玉米秸秆的比例增加而降低；（c）土壤¹³ C的丰度与累积的CO ₂排放呈显着正相关，因此与秸秆的添加比例也呈显着正相关。我们的结果表明，将玉米秸秆掺入温室土壤中是增加土壤呼吸并促进温室气体CO ₂的有意义的措施。生产蔬菜时的限制。另一方面，从蔬菜残渣中添加生物炭将增加土壤有机碳浓度。因此，同时施用从蔬菜残留物中获得的玉米秸秆和生物炭是保持沉没的日光温室蔬菜生产所必需的土壤功能的有效选择。