Sun Yang, Zeng Rong, Fang Wensheng, Hua Jvling, Huang Shuijin, Wang Qiuxia, Cao Aocheng, Zhu Feng, Zhang Haiyan
Institute of Plant Protection, Jiangxi Academy of Agricultural Sciences, Nanchang, China.
Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China.
Front Microbiol. 2023 Jul 13;14:1208973. doi: 10.3389/fmicb.2023.1208973. eCollection 2023.
Fumigation of soil using chloropicrin has been proven to significantly affect soil nutrient cycling, but the mechanism by which soil potassium conversion and plant uptake is promoted remains unclear. In this study, we conducted a fumigation experiment to investigate the effects of chloropicrin soil fumigation on the conversion of soil potassium post-fumigation (days 7-70), and its mechanisms, tomatos were planted in fumigated and non-fumigated soils to enable further comparisons. Results showed that the content of rapidly available potassium and available potassium decreased by 16-24% and 17-23% at day 28 respectively, when tomato was planted in chloropicrin-fumigated soils compared to the non-fumigated soils. The potassium content of tomato planted in fumigated soil was significantly higher than that planted in non-fumigated soil (30.3 vs. 21.9 mg g dry weight). Chloropicrin fumigation resulted in a significant change in the soil bacterial and fungal community structures, and trigged a long-term (at least 70-day) decrease in microbial diversity. Network analysis showed that chloropicrin soil fumigation changed microbial co-occurrence patterns by decreasing bacterial total links, nodes, and average degree, and increasing fungal total links, nodes, and average degree. Chloropicrin fumigation caused significant changes in the relative abundance of species, which are involved in potassium dissolution. Structural equation model (SEM) suggested that fumigation with chloropicrin enhanced the contribution of soil potassium to tomato growth and reduced the contribution of bacterial communities. Together, the results of our study help in understanding the crop yield enhancement mechanism of soil fumigation.
使用氯化苦对土壤进行熏蒸已被证明会显著影响土壤养分循环，但促进土壤钾转化和植物吸收的机制仍不清楚。在本研究中，我们进行了一项熏蒸实验，以研究氯化苦土壤熏蒸对熏蒸后土壤钾转化（第7 - 70天）的影响及其机制，在熏蒸和未熏蒸的土壤中种植番茄以进行进一步比较。结果表明，与未熏蒸土壤相比，当番茄种植在氯化苦熏蒸的土壤中时，速效钾和有效钾含量在第28天分别下降了16 - 24%和17 - 23%。种植在熏蒸土壤中的番茄钾含量显著高于种植在未熏蒸土壤中的番茄（30.3对21.9毫克/克干重）。氯化苦熏蒸导致土壤细菌和真菌群落结构发生显著变化，并引发微生物多样性长期（至少70天）下降。网络分析表明，氯化苦土壤熏蒸通过减少细菌的总连接数、节点数和平均度，以及增加真菌的总连接数、节点数和平均度，改变了微生物共现模式。氯化苦熏蒸导致参与钾溶解的物种相对丰度发生显著变化。结构方程模型（SEM）表明，氯化苦熏蒸增强了土壤钾对番茄生长的贡献，降低了细菌群落的贡献。总之，我们的研究结果有助于理解土壤熏蒸提高作物产量的机制。
