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Stand development reduces soil carbon mineralization in rubber plantations through regulating microbial metabolic strategy and substrate availability

文献类型： 外文期刊

作者： Ren, Changqi 1 ; Li, Gang 2 ; Wu, Dongming 1 ; Zou, Yukun 1 ; Li, Qinfen 1 ; Tian, Yingjie 1 ; Wang, Jinchuang 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Environm & Plant Protect Inst, 4 Xueyuan Rd, Haikou 571101, Peoples R China

2.Hainan Land Reservat Consolidat & Trading Ctr, Haikou 570203, Hainan, Peoples R China

3.China West Normal Univ, Coll Environm Sci & Engn, Nanchong 637009, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Low carbon Green Agr Trop Reg China, Hainan Key Lab Trop Ecocirculing Agr, Haikou 571101, Peoples R China

5.Natl Agr Expt Stn Agr Environm, Natl Observat & Res Stn, Trop Agroecosyst, Danzhou 571737, Peoples R China

关键词： Rubber plantation; Stand age; Soil organic carbon mineralization; Microbial metabolism strategy; Substrate availability; Soil C and N pool

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.6； 五年影响因子：5.7 ）

ISSN： 0926-6690

年卷期： 2024 年 218 卷

页码：

收录情况： SCI

摘要： Forest age, a critical variable for land-use decision makers, is known to change soil microbial communities. However, how such changes affect microbial metabolic strategy and the associated soil C mineralization processes in different forest ages remains unknown, especially in tropical region. To address this issue, three different aged rubber plantations, namely 4-year-old (Young, YRP), 15-year-old (Mature, MRP), and 31-year-old (Old, ORP), were studied to reveal the soil mineralization characteristics. Furthermore, to understand the mechanism from the coupled perspective of decomposers and substrate availability, the microbial metabolic strategy was deciphered by 2D-COS-Biolog assay, and linked with soil microbial composition and labile-/ recalcitrant- organic pools. Results showed that YRP was characterized by having more copiotrophic taxa (e.g., actinobacteria) and the largest G(-)/G(+) ratio and invertase activity. Thus, YRP exhibited a preferential utilization for carbohydrate and the largest SOC mineralization rate. In contrast, regardless of abundant labile C and N pools in MRP, the soil microbial communities were shifted to oligotrophic taxa in utilizing resistant polymer, and MRP contained abundant G(+), fungi and arbuscular mycorrhizal fungi related to aggregate formation. As a result, the soil mineralization rate in MRP was reduced by 66 % compared with YRP. However, the SOC mineralization rate was unchanged from MRP to ORP, primarily because the increased proportion of recalcitrant nutrient pool, and soil microorganism had greater priority in utilizing relatively resistant amine. The structural equation modeling revealed that the variations in mineralization were mainly regulated by soil microbial composition and metabolic strategy, and partially affected by soil C and N pools. Furthermore, random forest model indicated that soil pH, NH4-N and C/N were also the crucial factor for mineralization by affecting soil microbial communities during stand development. In summary, these findings improve our understanding in soil C budget and contribute to the C accurate management during plantation development.

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