| 土壤养分对作物茎叶稳定碳同位素组成和生物产量的影响 |
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| 关键词:δ13C soil nutrient sorghum biomass |
| 基金项目:国家“十五”科技攻关计划(2002BA517A11)，PPIC北京办事处NMS基金，中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室开放基金资助 |
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| 摘要: |
| The Effect of Soil Nutrients on Crop Organism δ13C and Biomass |
| Using the data obtained from experiments conducted in pots, the authors analyzed the conditions of soil nutrient and the relationship between the carbon isotope discrimination in crop and the crop biomass under the condition of different soil nutrient contents. The research has reached the follow conclusions:The nutrient limitation factors are P, N, Mn and Zn, and the order of nutrient deficiency is P>Mn>Zn>N in Xiaojingzi farm soil in Jinchang. P and N fertilizers make up the limitation factors in Huli soil in Wuwei. In Baiyun soil of Wuwei, N, Zn and Mn are the limitation factors, with the order being N>Zn>Mn.The variations of δ 13C values of sorghum leaf and stem in three sorts of soils are as follows: compared with other treatments in these soils, the δ 13C values of OPT treatments are all the highest. The δ 13C values of sorghum in Xiaojingzi farm, Huli and Baiyu are -12.016‰,-12.26‰ and -12.305‰, respectively. These data suggest that under the optimal nutrient condition the plant grows sufficiently and the δ 13C is highest among all treatments. Among all the non-added ample nutrient treatments, the biomasses are dropping with the decreasing δ 13C values,and it seems that nutrient deficiency leads to the decrease of the crop biomass and the δ 13C values. In added treatments, the connection between crop biomass and carbon isotope discrimination is complex. |
| ZHAO Liang-ju,LIU Xiao-hong,XIAO Hong-liang,GUO Tian-wen.2003.The Effect of Soil Nutrients on Crop Organism δ13C and Biomass[J].Acta Geoscientica Sinica,24(6):519-524. |
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