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Title: Carbon flow in the plant-soil-microbe continuum at different growth stages of maize grown in a Mollisol
Author: Z. H. Yu, Y. S. Li, J. Jin, X. B. Liu and G. H. Wang
Corresponding Author: 金剑
Source: Archives of Agronomy and Soil Science
Issued Date: 2017
DOI: 10.1080/03650340.2016.1211788
Volume: 63, Issue:3, Pages:362-374
Abstract: Understanding the photosynthetic carbon (C) dynamics in the plant-soil-microbe continuum is critical to the C sequestration in soils. However, such information is limited in maize (Zea mays L.) in Mollisols. Pot-grown maize was labelled with (CO2)-C-13 at the 10-leaf, 15-leaf, heading, milk and dent stages to investigate the photosynthetic C flow in a maize-soil system and its contribution to soil organic carbon (SOC) in Mollisols. The majority of fixed C-13 was recovered in shoots, ranging from 44.7% to 78.6%. The allocation of C-13 fixed at different growth stages to belowground (roots and soil) gradually decreased over the growing period, indicating that the strength of root C sink is stronger at the early stages. However, the proportion of C-13 in dissolved organic C and microbial biomass C to that in SOC significantly increased as the growth stages advanced. Over the entire growth period, the contribution of root-derived C to SOC was estimated to be 5461 mg C plant(-1) growth period(-1), of which approximately 79% was synthesized during the vegetative stages. Therefore, the input of photosynthetic C by maize plants into SOC mainly occurred during the younger stages of the plant, favouring the storage of SOC in Mollisols.
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Content Type: 期刊论文
URI: http://ir.iga.ac.cn/handle/131322/7647
Appears in Collections:湿地与全球变化学科组_期刊论文

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