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Effect of nitrogen fertilizer on rice photosynthate allocation and carbon input in paddy soil

文献类型： 外文期刊

作者： Xiao, Mouliang 2 ; Zang, Huadong 4 ; Ge, Tida 1 ; Chen, Anlei 1 ; Zhu, Zhenke 1 ; Zhou, Ping 1 ; Atere, Cornelius T. 1 ;

作者机构： 1.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha, Hunan, Peoples R China

2.Chinese Acad Sci, Inst Subtrop Agr, Changsha Res Stn Agr & Environm Monitoring, Changsha, Hunan, Peoples R China

3.Univ Chinese Acad Sci, Beijing, Peoples R China

4.China Agr Univ, Coll Agron & Biotechnol, Beijing, Peoples R China

5.Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, Gottingen, Germany

6.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha, Hunan, Peoples R China

7.RUDN Univ, Agrotechnol Inst, Moscow, Russia

关键词： nitrogen fertilization; pulse-labelling and tracing; rhizodeposition; rice cropping; soil organic matter

期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.949； 五年影响因子：4.626 ）

ISSN： 1351-0754

年卷期： 2019 年 70 卷 4 期

页码：

收录情况： SCI

摘要： The photosynthate carbon (C) released in the rhizosphere plays a crucial role in C sequestration, microbial activities and nutrient availability in soil. Nitrogen (N) fertilization modifies the allocation and dynamics of photosynthates in paddy rice systems, but these effects depend on plant growth stages. Rice (Oryza sativa L.) plants were pulse labelled with (CO2)-C-13 at the tillering, elongation, heading and grain-filling stages with 0 and 225 kg N ha(-1) fertilizer. The plants and soil were sampled shortly after each pulse labelling and at harvest. Relative C-13 (as % of assimilated C) in the roots and rhizosphere soil was largest at the early growth stage (tillering) and subsequently decreased. At harvest, 68% of the rhizodeposited C remained in bulk soil without N fertilizer, which corresponded to 6.2% of the net assimilated C-13. The absolute amount of net belowground C input (root + rhizodeposition) by rice was 268 and 468 kg C ha(-1) under 0 and 225 kg N ha(-1) fertilizer, of which rhizodeposition accounted for 60 and 40%, respectively. We concluded that N fertilization raised the belowground C input by rice mainly by increasing root biomass rather than by rhizodeposition. Highlights Rice photosynthesis-derived carbon (C) was quantified in soil by multiple pulse labelling with (CO2)-C-13 Young rice plants allocated more assimilates into the soil compared to mature plants Nitrogen deficiency led to greater C retention in bulk soil than in the rhizosphere Nitrogen fertilization increased the net belowground C input mainly with larger root biomass

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