Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 147, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2020.107849
Keywords
Rubber plantation; High-throughput sequencing; Soil organic matter; Enzyme activities
Categories
Funding
- National Natural Science Foundation of China [31870616]
- Central Public-interest Scientific Institution Basal Research Fund for Innovative Research Team Program of CATAS [17CXTD-04, 1630042019024, 1630042019015]
- China Scholarship Council (CSC) [201703260024]
- Australian Research Council [DP170104634]
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The conversion of rainforests to plantations leads to about 50% loss in the organic carbon (C) content of the soil and strongly influences nitrogen (N) cycling, potentially increasing greenhouse gas emissions. However, the effect of land-use change in forests on the microbial communities responsible for C and N cycling processes remains poorly understood. This study quantified C and N fractions of soil organic matter in a tropical forest, rubber agroforestry system, 5- and 15-year-old rubber plantations. The community structure and abundance of fungi and bacteria were studied using high-throughput sequencing and q-PCR. Forest conversion substantially altered community structure and abundance of microbial communities. Rainforest conversion to plantation enhanced bacterial diversity and reduced the soil C mineralization rate. In addition, land-use change also enhanced the soil N mineralization rate in 5-year-old rubber plantation and agroforestry system. A structural equation modelling suggested that soil microbial communities played more dominant roles in driving the shift in C and N cycles caused by land-use change than soil C and N pools. These mechanistic insights into the differential control of soil fungal and bacterial communities on C and N mineralization has implications for managing land-use changes in tropical forest ecosystems.
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