Responses of Soil Organic Carbon Mineralization and Microbial Communities to Leaf Litter Addition under Different Soil Layers

被引：13

作者：

Zhang, Min ^{[1
,2
,3
]}

Dong, Li-Guo ^{[1
,2
,3
]}

Fei, Shi-Xuan ^{[1
,2
,3
]}

Zhang, Jia-Wen ^{[1
,2
,3
]}

Jiang, Xu-Meng ^{[1
,2
,3
]}

Wang, Ying ^{[1
,2
,3
]}

Yu, Xuan ^{[1
,2
,3
]}

机构：

[1] Northwest A&F Univ, Coll Forestry, Dept Forestry, Yangling 712100, Shaanxi, Peoples R China

[2] Key Comprehens Lab Forestry, Yangling 712100, Shaanxi, Peoples R China

[3] Key Lab Silviculture Loess Plateau State Forestry, Yangling 712100, Shaanxi, Peoples R China

来源：

FORESTS | 2021年 / 12卷 / 02期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

priming effect; litter species; soil microbial composition; deep soil; SOM mineralization; LONG-TERM FERTILIZATION; FRESH CARBON; DECOMPOSITION; NITROGEN; MATTER; FOREST; QUALITY; BIOMASS; LABILE; INPUTS;

D O I：

10.3390/f12020170

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

The mechanism of how soil carbon pools change when coniferous forests are converted into conifer-broadleaf mixed forests is poorly understood. In this study, the impact of additional carbon inputs on soil organic carbon mineralization and microbial communities was evaluated. In a microcosm incubation experiment, three types of C-13-labeled litter (Pinustabulaeformis (PT), Robiniapseudoacacia (RP), and a mixture of PT and RP (1:1, PR)) were added in to top (0-20 cm) and deep (60-80 cm) soil collected from a Chinese pine plantation. The priming effect (PE) and specific microbial groups involved in PE were studied. PT and RP addition to topsoil induced a negative PE. In deep soil, the decomposition rates of soil organic matter (SOM) after adding PT and mixture increased by 16.6% and 34.6% compared to those without litter. The addition of RP with a lower C:N ratio had a stronger negative PE than adding PT or mixture. Moreover, the PE in deep soil was more intense after all litter additions. In topsoil, the litter-derived carbon was mainly incorporated into 16:0, 18:1 omega 9c, and 18:1 omega 7c fatty acids. In conclusion, the addition of broadleaf litter into coniferous plantations might be beneficial for enhancing deep soil carbon stocks.

引用

页码：1 / 19

页数：17

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