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Coupling and Decoupling of Soil Carbon and Nutrient Cycles Across an Aridity Gradient in the Drylands of Northern China: Evidence From Ecoenzymatic Stoichiometry

文献类型：期刊论文

作者Feng, Jiao1,2; Wei, Kai2; Chen, Zhenhua2; Lu, Xiaotao2; Tian, Jihui2; Wang, Chao2; Chen, Lijun2
刊名GLOBAL BIOGEOCHEMICAL CYCLES
出版日期2019-05-01
卷号33期号:5页码:559-569
ISSN号0886-6236
DOI10.1029/2018GB006112
通讯作者Chen, Lijun(ljchenchina@hotmail.com)
英文摘要Drylands are characterized by stressful conditions with the limitation of both carbon (C) and nutrients, particularly nitrogen (N) and phosphorus (P). Biological C, N, and P releases from soil organic matter by enzymes are essential components for biogeochemical cycles and are sensitive to the climate in drylands. However, how the ecoenzymatic C:N:P stoichiometry responds to environmental factors (i.e., climatic and edaphic factors) over broad geographical scales remains largely unclear. We examined the patterns of ecoenzymatic C:N:P ratios across a 3,700-km aridity gradient (0.43 < aridity < 0.97) in northern China. In wetter sites (aridity < 0.70), the relative C:N:P acquisition ratios via enzymes remained relatively constant with increasing aridity. In contrast, in drier sites (aridity > 0.70), the enzymatic C: nutrient (N and P) ratios declined as the aridity increased, while the enzymatic P:N ratios were mostly lower than those in the wetter sites. In drier sites with low C availability, the increasing carbon use efficiency and the increasing proportion of C converted to biomass (than the proportion of respiration) contributed to the declines of the enzymatic C:nutrient ratios as the aridity increased. The overall lower enzymatic P:N ratios were related to the higher soil P availability compared with N availability (higher organic P and lower soil NH4+:available P ratios) in drier sites. Overall, our findings indicate that intrinsic linkages of biological C, N, and P acquisitions and cycles were broken at the aridity threshold of 0.70, with higher acquisition efforts for N and P (particularly for N) with increasing aridity in drier sites with aridity > 0.70.
资助项目National Natural Science Foundation of China[41171241] ; National Natural Science Foundation of China[41201290] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB15010400] ; Youth Innovation Promotion Association CAS[2014174]
WOS研究方向Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000470318300003
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS
源URL[http://ir.imr.ac.cn/handle/321006/133686]  
专题金属研究所_中国科学院金属研究所
通讯作者Chen, Lijun
作者单位1.Chinese Acad Sci, Wuhan Bot Garden, Wuhan, Hubei, Peoples R China
2.Chinese Acad Sci, Inst Appl Ecol, Shenyang, Liaoning, Peoples R China
推荐引用方式
GB/T 7714		 Feng, Jiao,Wei, Kai,Chen, Zhenhua,et al. Coupling and Decoupling of Soil Carbon and Nutrient Cycles Across an Aridity Gradient in the Drylands of Northern China: Evidence From Ecoenzymatic Stoichiometry[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2019,33(5):559-569.
APA Feng, Jiao.,Wei, Kai.,Chen, Zhenhua.,Lu, Xiaotao.,Tian, Jihui.,...&Chen, Lijun.(2019).Coupling and Decoupling of Soil Carbon and Nutrient Cycles Across an Aridity Gradient in the Drylands of Northern China: Evidence From Ecoenzymatic Stoichiometry.GLOBAL BIOGEOCHEMICAL CYCLES,33(5),559-569.
MLA Feng, Jiao,et al."Coupling and Decoupling of Soil Carbon and Nutrient Cycles Across an Aridity Gradient in the Drylands of Northern China: Evidence From Ecoenzymatic Stoichiometry".GLOBAL BIOGEOCHEMICAL CYCLES 33.5(2019):559-569.

入库方式： OAI收割

来源：金属研究所

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