Fate of photosynthetically-fixed carbon in soybean crops measured using C-13 labelling after long-term fertilization of Phaeozem soils in Northeast China

文献类型： 外文期刊

第一作者： Qiao, Yunfa

作者： Qiao, Yunfa;Han, Xiaozeng;Miao, Shujie;Silva, Lucas C. R.;Horwath, William R.;Yan, Chunjuan

作者机构：

关键词： C-13;soil carbon;fertilization;Phaeozem;soybean

期刊名称：ZEMDIRBYSTE-AGRICULTURE （ 影响因子：1.083； 五年影响因子：1.554 ）

ISSN： 1392-3196

年卷期： 2012 年 99 卷 4 期

页码：

收录情况： SCI

摘要： A good understanding of the fate of photosynthetically-fixed carbon (C) in the plant-soil system following fertilization is crucial to manage agricultural soils. The objective of this study was to analyse the allocation of C fixed by soybean and its response to long-term fertilization. We conducted a C-13 pulse labelling experiment, using soybean grown in Phaeozem (PH) soils (FAO) under five fertilization treatments: inorganic fertilization (NPK, NP, NK), inorganic and organic fertilization (NPKM) and no fertilization (CK) as control. The C-13 pulse labelling was conducted at full pod (R-4) stage. Results showed that fertilization always increased C accumulation in the biomass of soybean plants, with the highest C content measured in the NPKM treatment (35%) and lower values observed in NP, NK and CK than in the NPK treatment. The net C fixed after labelling varied between 8.6 and 21.4 mg C-13 per plant with maximal values observed in the NPKM treatment. More than 4/5 of the fixed C-13 was found in shoots at day 0. The label was exported from shoots to roots with 53.3% remaining in shoots and 7.5% measured in roots at day 7 after labelling. The percent of net fixed C incorporated into soils was also affected by fertilization. Compared to CK, the incorporation of C-13 into soils was 24.4, 14.8, 18.2 and 50.8 % in NP, NK, NPK and NPKM treatments, respectively. The net accumulation of labelled C in soils changed with fertilization from 160 to 564 kg ha(-1) C season(-1). This indicates that the accumulation of soybean-derived C following NPKM addition would significantly increase C levels in Northeast Chinese Phaeozem soils.

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