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Conversion to agroforestry and monoculture plantation is detrimental to the soil carbon and nitrogen cycles and microbial communities of a rainforest

文献类型： 外文期刊

作者： Wang, Jinchuang 1 ; Zou, Yukun 1 ; Di Gioia, Diana 4 ; Singh, Brajesh K. 5 ; Li, Qinfen 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou, Hainan, Peoples R China

2.Hainan Key Lab Trop Ecocircular Agr, Haikou, Hainan, Peoples R China

3.Minist Agr, Agr Environm Sci Observat & Expt Stn, Danzhou, Hainan, Peoples R China

4.Alma Mater Studiorum Univ Bologna, Dept Agr & Food Sci Distal, Viale Fanin 44, I-40127 Bologna, Italy

5.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia

6.Western Sydney Univ, Global Ctr Land Based Innovat, Penrith, NSW 2751, Australia

关键词： Rubber plantation; High-throughput sequencing; Soil organic matter; Enzyme activities

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

ISSN： 0038-0717

年卷期： 2020 年 147 卷

页码：

收录情况： SCI

摘要： 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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