Fertilization effects on atmospheric methane uptake by a rubber tree plantation in Thailand: a direct microbial inhibition or an indirect stimulation by higher tree water use?

该提案已于2021年11月通过。由于新冠肺炎和边境限制，最初计划于2022年3月首次前往泰国进行研究活动，但推迟到2022年9月。但是，项目进展顺利，由于日本和泰国的小组进行了良好的准备和协调，最初的延误没有对项目产生影响。泰国合作伙伴的积极性和参与度令人印象深刻，实地考察和实地工作的组织非常棒。今年组织了两次考察，一次是在2022年9月开始长期测量（甲烷通量、液流：2人），另一次是在2023年2月进行密集测量和采样（微生物学、氮循环、土壤养分捕获：4人）。前6个月的甲烷通量测量显示，施肥对该橡胶林土壤CH4预算的影响非常明显，不仅如我们假设的那样减少了好氧氧化，而且增加了更深土层的甲烷产量。我们的泰国合作伙伴已经成功申请了一个大型的“重塑KU”项目，其中包括我们的JSPS项目，通过这个项目，我们中的两位可以在这个新的财政年度被邀请为教授。

The proposal has been adopted in November 2021. Due to the Covid 19 and border restrictions, the first trip in Thailand for research activity was initially scheduled in March 2022 but postponed to September 2022. However, the project is progressing smoothly and the initial delay had no impact on it owing to the good preparation and coordination between the teams in Japan and Thailand. The motivation and engagement of our Thai partner is really impressive, and the organization of field trip and field work is awesome.Two trips were organized this year, one in September 2022 to initiate the long-term measurements (methane flux, sap flow: 2 persons) and one in February 2023 for intensive measurements and samplings (microbiology, nitrogen cycling, soil nutrient capture: 4 persons).The first 6 months of methane flux measurements showed a very clear effect of fertilization on the soil CH4 budget of this rubber plantation, not only reducing aerobic oxidation as we hypothesized but also increasing methane production in deeper soil layers.Our Thai partners have successfully applied for a large “Reinventing KU” program which includes our JSPS project and through which two of us could be invited Professors in this new fiscal year.