Carbon and nitrogen additions induce distinct priming effects along an organic-matter decay continuum

被引:87
|
作者
Qiao, Na [1 ,6 ]
Xu, Xingliang [2 ]
Hu, Yuehua [1 ]
Blagodatskaya, Evgenia [3 ,4 ,7 ]
Liu, Yongwen [5 ]
Schaefer, Douglas [1 ]
Kuzyakov, Yakov [3 ,4 ]
机构
[1] Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, 11A Datun Rd, Beijing 100101, Peoples R China
[3] Univ Gottingen, Dept Soil Sci Temperate Ecosyst, Gottingen, Germany
[4] Univ Gottingen, Dept Agr Soil Sci, Gottingen, Germany
[5] Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
[6] Chinese Acad Sci, Grad Sch, 19A Yuquan Rd, Beijing 100049, Peoples R China
[7] Russian Acad Sci, Inst Physicochem & Biol Problems Soil Sci, Inst Skaya 26, Pushchino 142290, Moscow Region, Russia
来源
SCIENTIFIC REPORTS | 2016年 / 6卷
基金
中国国家自然科学基金; 俄罗斯科学基金会;
关键词
SOIL CARBON; N AVAILABILITY; USE EFFICIENCY; DECOMPOSITION; STOICHIOMETRY; LIMITATION; NUTRIENT; LITTER; GROWTH; RATIO;
D O I
10.1038/srep19865
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Decomposition of organic matter (OM) in soil, affecting carbon (C) cycling and climate feedbacks, depends on microbial activities driven by C and nitrogen (N) availability. However, it remains unknown how decomposition of various OMs vary across global supplies and ratios of C and N inputs. We examined OM decomposition by incubating four types of OM (leaf litter, wood, organic matter from organic and mineral horizons) from a decay continuum in a subtropical forest at Ailao Mountain, China with labile C and N additions. Decomposition of wood with high C:N decreased for 3.9 to 29% with these additions, while leaf decomposition was accelerated only within a narrow C:N range of added C and N. Decomposition of OM from organic horizon was accelerated by high C:N and suppressed by low C:N, but mineral soil was almost entirely controlled by high C:N. These divergent responses to C and N inputs show that mechanisms for priming (i.e. acceleration or retardation of OM decomposition by labile inputs) vary along this decay continuum. We conclude that besides C:N ratios of OM, those of labile inputs control the OM decay in the litter horizons, while energy (labile C) regulates decomposition in mineral soil. This suggests that OM decomposition can be predicted from its intrinsic C:N ratios and those of labile inputs.
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页数:8
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