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(δ^(15)N)provides integrated information on ecosystem N dynamics,and carbon isotope natural abundance(δ^(13)C)has been used to infer how water-using processes of plants change in terrestrial ecosystems.However,howδ^(13)C andδ^(15)N abundances in plant life and soils respond to N addition and water availability change is still unclear.Thus,δ^(13)C andδ^(15)N 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 theδ^(13)C andδ^(15)N values of dominant plant foliage,litterfall,fungal sporophores,roots,and soils in the study.The results showed thatδ^(15)N values of foliage,litterfall,and surface soil layer’s(0–10 cm)total N were significantly increased by N addition,whileδ^(15)N values of fine roots and coarse roots were considerably decreased.Nitrogen addition also significantly increased theδ^(13)C value of fine roots and total N concentration of the surface soil layer compared with the control.The C concentration,δ^(13)C,andδ^(15)N values of foliage andδ^(15)N 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 theδ^(13)C andδ^(15)N values of foliage as well as theδ^(15)N values of fine roots andδ^(13)C values of litterfall.Furthermore,foliarδ^(15)N values were significantly correlated with foliageδ^(13)C values,surface soilδ^(15)N values,surface soil C concentration,and N concentrations.Nitrogen concentrations andδ^(13)C values of foliage were significantly correlated withδ^(15)N 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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《中国林学（英文版）》 |2020年第4期|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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School of Life Sciences Qufu Normal University Qufu 273165 Shandong China;

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

School 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 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 China;

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

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

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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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