期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 71, 期 -, 页码 13-20出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2014.01.004
关键词
Soil organic C mineralization; Litter addition; Nutrient availability; Nitrogen deposition; Subtropical forest; Priming effect; Phospholipid fatty acids
类别
资金
- National Basic Research Program of China (973 Program) [2012CB416905]
- National Natural Science Foundation of China [41030533, 31070436, 41201254]
Microorganisms are vital in soil organic carbon (SOC) mineralization. The deposition of atmospheric nitrogen (N) and phosphorus (P), as well as leaf-litter addition, may affect SOC mineralization and microbial community structure by changing the availability of soil nutrients and carbon (C). In this study, we added leaf-litters labeled by C-13 (Pinus massoniana and Michelia macclurei) and nutrients (ammonium chloride and monopotassium phosphate) alone and in combination to soils collected from a coniferous forest in subtropical China. We aimed to investigate the effect of leaf-litter and nutrient addition on SOC mineralization and soil microbial community. CO2 production was continuously measured during 120-day laboratory incubation, and CO2 sources were partitioned using C-13 isotopic techniques. The addition of P. massoniana and M. macclurei leaf-litters increased SOC mineralization by 7.4% and 22.4%, respectively. N and P addition alone decreased soil respiration by 6.6% and 71%, respectively. Compared with P addition, N addition exerted a higher inhibitory effect on SOC mineralization induced by leaf-litter addition. Leaf-litter addition stimulated soil microbial activity and decreased the ratio of bacteria to fungi as a result of greater promotion on fungal growth. Moreover, 16:0 and 18:1 omega 9c phospholipid fatty acids (PLFAs) had greater amount of C-13 incorporation than other PLFAs, especially in nutrient-addition treatments. These results suggested that increased C input through leaf litter can stimulate SOC mineralization, whereas atmospheric N and P deposition can reduce this stimulatory effect and promote soil C storage in subtropical forests. Our results also illustrated that the use of C-13-labeled leaf litter coupled with C-13-PLFA profiling is a powerful tool for determining the microbial utilization of C. (C) 2014 Elsevier Ltd. All rights reserved.
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