Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction:interpretation of C and N dynamics

Guoyong Yan; Shijie Han; Mingxin Zhou; Wenjing Sun; Binbin Huang; Honglin Wang; Yajuan Xing; Qinggui Wang

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Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction:interpretation of C and N dynamics

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Background:The nitrogen isotope natural abundance(δ15N)provides integrated information on ecosystem N dynamics,and carbon isotope natural abundance(δ13C)has been used to infer how water-using processes of plants change in terrestrial ecosystems.However,howδ13C andδ15N abundances in plant life and soils respond to N addition and water availability change is still unclear.Thus,δ13C andδ15N abundances in plant life and soils were used to investigate the effects of long-time(10 years)N addition(+50 kg N·ha−1·yr−1)and precipitation reduction(−30%of throughfall)in forest C and N cycling traits in a temperate forest in northern China.Results:We analyzed theδ13C andδ15N values of dominant plant foliage,litterfall,fungal sporophores,roots,and soils in the study.The results showed thatδ15N values of foliage,litterfall,and surface soil layer’s(0–10 cm)total N were significantly increased by N addition,whileδ15N values of fine roots and coarse roots were considerably decreased.Nitrogen addition also significantly increased theδ13C value of fine roots and total N concentration of the surface soil layer compared with the control.The C concentration,δ13C,andδ15N values of foliage andδ15N values of fine roots were significantly increased by precipitation reduction,while N concentration of foliage and litterfall significantly decreased.The combined effects of N addition and precipitation reduction significantly increased theδ13C andδ15N values of foliage as well as theδ15N values of fine roots andδ13C values of litterfall.Furthermore,foliarδ15N values were significantly correlated with foliageδ13C values,surface soilδ15N values,surface soil C concentration,and N concentrations.Nitrogen concentrations andδ13C values of foliage were significantly correlated withδ15N values and N concentrations of fine roots.Conclusions:This indicates that plants increasingly take up the heavier 15N under N addition and the heavier 13C and 15N under precipitation reduction,suggesting that N addition and precipitation reduction may lead to more open forest ecosystem C and N cycling and affect plant nutrient acquisition strategies.

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《森林生态系统：英文版》 |2020年第4期|P.646-658|共13页
作者
Guoyong Yan; Shijie Han; Mingxin Zhou; Wenjing Sun; Binbin Huang; Honglin Wang; Yajuan Xing; Qinggui Wang;
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作者单位

School of Life Sciences Qufu Normal University Qufu 273165 Shandong ChinaCollege of Agricultural Resource and Environment Heilongjiang University 74 Xuefu Road Harbin 150080 Heilongjiang ChinaSchool of Forestry Northeast Forestry University 26 Hexing Road Harbin 150040 Heilongjiang China.;

School of Life Sciences Henan University Kaifeng 475004 Henan China.;

Heilongjiang Institute of Construction Technology 999 Xueyuan Road Harbin 150025 Heilongjiang China;

School of Forestry Northeast Forestry University 26 Hexing Road Harbin 150040 Heilongjiang China.;

College of Agricultural Resource and Environment Heilongjiang University 74 Xuefu Road Harbin 150080 Heilongjiang China;

College of Agricultural Resource and Environment Heilongjiang University 74 Xuefu Road Harbin 150080 Heilongjiang China;

School of Life Sciences Qufu Normal University Qufu 273165 Shandong ChinaCollege of Agricultural Resource and Environment Heilongjiang University 74 Xuefu Road Harbin 150080 Heilongjiang China;

School of Life Sciences Qufu Normal University Qufu 273165 Shandong ChinaCollege of Agricultural Resource and Environment Heilongjiang University 74 Xuefu Road Harbin 150080 Heilongjiang ChinaSchool of Forestry Northeast Forestry University 26 Hexing Road Harbin 150040 Heilongjiang China.;

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正文语种 chi
中图分类林业基础科学;
关键词
δ13C; δ15N; N addition; Precipitation reduction; Nutrient acquisition strategies;

机译：Δ13c;δ15n;n加;降水;营养收购策略;

Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction:interpretation of C and N dynamics

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