Although tropical forests play a disproportionate role in regulating global C and N cycles, the impact of elevated N-deposition on these ecosystems is not well studied. Our goal was to determine whether elevated N input had an effect on soil C and N cycling in seasonally dry tropical forests along a precipitation gradient (with mean annual precipitation ranging from 540 mm to 1040 mm). We used a microcosm N-fertilization experiment to explore how soil C and N dynamics respond to N addition. NO2 fluxes and net N-mineralization and nitrification rates in soils increased considerably with mean annual precipitation. In contrast, CO2 fluxes decreased with increased mean annual precipitation. Organic C concentrations in soil from both the driest and the wettest forest sites decreased significantly with elevated N input. However, microbial biomass responded to N enrichment differently across sites. In soils from the driest site, microbial biomass C and N concentrations declined significantly with elevated N input. In contrast, in soils from the wettest site, microbial biomass C and N immobilization increased. Net N-mineralization and nitrification rates did not respond to elevated N input. In soils from the driest site, elevated N input resulted in an increase in C and N losses due to CO2 and N2O fluxes. However, elevated N input to soils from the wettest site did not consistently affect CO2 and N2O fluxes. In soils from the wettest site, the main response to N enrichment was an increase only in CO2 fluxes. We conclude that the reactions of seasonally dry tropical forest soils to increases in N deposition will vary, depending on the details of the site's water limitations, which appear as a regulatory mechanism of the N cycle in these soils. (C) 2013 Elsevier B.V. All rights reserved.
机构:
Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Zhang, Bei
Huang, Yuanyuan
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Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Huang, Yuanyuan
Qu, Zhi
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Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Qu, Zhi
Zhu, Tongbin
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China Geol Survey, Karst Dynam Lab, MLR & Guangxi, Inst Karst Geol, Guilin 541004, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Zhu, Tongbin
Yu, Longfei
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Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
机构:
Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Eisenlord, Sarah D.
Freedman, Zachary
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Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Freedman, Zachary
Zak, Donald R.
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Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Zak, Donald R.
Xue, Kai
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Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Xue, Kai
He, Zhili
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Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
He, Zhili
Zhou, Jizhong
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Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
机构:
Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Zhang, Bei
Huang, Yuanyuan
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h-index: 0
机构:
Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Huang, Yuanyuan
Qu, Zhi
论文数: 0引用数: 0
h-index: 0
机构:
Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Qu, Zhi
Zhu, Tongbin
论文数: 0引用数: 0
h-index: 0
机构:
China Geol Survey, Karst Dynam Lab, MLR & Guangxi, Inst Karst Geol, Guilin 541004, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Zhu, Tongbin
Yu, Longfei
论文数: 0引用数: 0
h-index: 0
机构:
Jinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Inst Environm & Ecol, Shenzhen 518055, Peoples R ChinaJinan Univ, Coll Life Sci & Technol, Guangzhou 510632, Peoples R China
机构:
Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Eisenlord, Sarah D.
Freedman, Zachary
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机构:
Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Freedman, Zachary
Zak, Donald R.
论文数: 0引用数: 0
h-index: 0
机构:
Univ Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Univ Michigan, Dept Ecol & Evolutionary Biol, Ann Arbor, MI 48109 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Zak, Donald R.
Xue, Kai
论文数: 0引用数: 0
h-index: 0
机构:
Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
Xue, Kai
He, Zhili
论文数: 0引用数: 0
h-index: 0
机构:
Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA
He, Zhili
Zhou, Jizhong
论文数: 0引用数: 0
h-index: 0
机构:
Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USAUniv Michigan, Sch Nat Resources & Environm, Ann Arbor, MI 48109 USA