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?

该建议已于二零二一年十一月获采纳。由于新型冠状病毒疫情及边境限制，首次前往泰国进行研究活动原定于二零二二年三月进行，但已推迟至二零二二年九月。不过，该项目进展顺利，由于日本和泰国工作队之间的良好准备和协调，最初的拖延没有对其产生影响。我们的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工作令人印象深刻。今年组织了两次旅行，一次是在2022年9月，以启动长期测量（甲烷通量、树干液流：2人）和2023年2月的一次密集测量和采样（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，施肥对该橡胶种植园土壤CH 4收支有非常明显的影响，不仅如我们假设的那样减少有氧氧化，而且还增加了深层土壤中的甲烷产量。我们的泰国合作伙伴已经成功地申请了一个大型的“重塑KU”项目，该计划包括我们的JSPS项目，通过该计划，我们中的两个人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.