Long-term nitrogen deposition inhibits soil priming effects by enhancing phosphorus limitation in a subtropical forest

被引:23
|
作者
Wang, Xiaohong [1 ,2 ]
Li, Shiyining [1 ,2 ]
Zhu, Biao [3 ,4 ]
Homyak, Peter M. [5 ]
Chen, Guangshui [1 ,2 ,6 ]
Yao, Xiaodong [1 ,2 ]
Wu, Dongmei [1 ,2 ]
Yang, Zhijie [1 ,2 ]
Lyu, Maokui [1 ,2 ,6 ]
Yang, Yusheng [1 ,2 ]
机构
[1] Fujian Normal Univ, Sch Geog Sci, Fujian Sanming Forest Ecosyst Natl Observat & Res, Fuzhou, Peoples R China
[2] State Key Lab Humid Subtrop Mt Ecol, Fuzhou, Peoples R China
[3] Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing, Peoples R China
[4] Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing, Peoples R China
[5] Univ Calif Riverside, Dept Environm Sci, Riverside, CA USA
[6] Fujian Normal Univ, Sch Geog Sci, Fuzhou 350007, Peoples R China
基金
美国国家科学基金会; 中国国家自然科学基金;
关键词
enzyme activity; nutrient availability; plant C input; soil C balance; SOM decomposition; tropical forest; ORGANIC-CARBON MINERALIZATION; MICROBIAL BIOMASS; EXTRACTION METHOD; USE EFFICIENCY; SEQUESTRATION; INCREASES; MATTER; MECHANISMS; COMMUNITY; LOWLAND;
D O I
10.1111/gcb.16718
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
It is widely accepted that phosphorus (P) limits microbial metabolic processes and thus soil organic carbon (SOC) decomposition in tropical forests. Global change factors like elevated atmospheric nitrogen (N) deposition can enhance P limitation, raising concerns about the fate of SOC. However, how elevated N deposition affects the soil priming effect (PE) (i.e., fresh C inputs induced changes in SOC decomposition) in tropical forests remains unclear. We incubated soils exposed to 9 years of experimental N deposition in a subtropical evergreen broadleaved forest with two types of C-13-labeled substrates of contrasting bioavailability (glucose and cellulose) with and without P amendments. We found that N deposition decreased soil total P and microbial biomass P, suggesting enhanced P limitation. In P unamended soils, N deposition significantly inhibited the PE. In contrast, adding P significantly increased the PE under N deposition and by a larger extent for the PE of cellulose (PEcellu) than the PE of glucose (PEglu). Relative to adding glucose or cellulose solely, adding P with glucose alleviated the suppression of soil microbial biomass and C-acquiring enzymes induced by N deposition, whereas adding P with cellulose attenuated the stimulation of acid phosphatase (AP) induced by N deposition. Across treatments, the PEglu increased as C-acquiring enzyme activity increased, whereas the PEcellu increased as AP activity decreased. This suggests that P limitation, enhanced by N deposition, inhibits the soil PE through varying mechanisms depending on substrate bioavailability; that is, P limitation regulates the PEglu by affecting soil microbial growth and investment in C acquisition, whereas regulates the PEcellu by affecting microbial investment in P acquisition. These findings provide new insights for tropical forests impacted by N loading, suggesting that expected changes in C quality and P limitation can affect the long-term regulation of the soil PE.
引用
收藏
页码:4081 / 4093
页数:13
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