Effect of N and P fertilization on the allocation and fixation of photosynthesized carbon in paddy soil. Issue 1 (1st January 2021)

• Record Type: Journal Article
• Authors: Zhran, Mostafa; Ge, Tida; Tong, Yaoyao; Zhu, Zhenke; Deng, Yangwu; Fahmy, Ahmed; Chen, Ming; Lynn, Tin Mar; Wu, Jinshui; Gunina, Anna
• Is Part Of: Ecosystem health and sustainability. Volume 7:Issue 1(2021)
• Publication Date: 2021-01-01
• Subjects: Paddy soil -- 13co2 continuous labeling -- fertilization -- carbon input -- rhizosphere -- bulk soil; Ecosystem health -- Periodicals; Environmental health -- Periodicals; Environmental policy -- Periodicals; Environmental engineering -- Periodicals; Environmental ethics -- Periodicals; Ecosystem management -- Periodicals; Ecosystem management; Environmental engineering; Environmental ethics; Environmental health; Environmental policy; Periodicals; 577
• DOI: 10.1080/20964129.2021.1941271
• Languages: English
• ISSNs: 2096-4129

Abstract

ABSTRACT: Potted rice seedlings independently treated with N, P, and NP were continuously 13 CO2 labeled to investigated the influence of N and P application on the contribution of photosynthesized C to the rhizosphere versus bulk soil and particulate organic matter (POM) versus mineral fraction (MIN). N and NP enhanced net assimilated 13 C on day 14 (D14), with maximum C assimilation occurring on day 22 (D22) under NP. Aboveground biomass retained more 13 C than belowground biomass for all treatments. 13C incorporation into the rhizosphere exceeded that in bulk soil, with the maximum (6–10%) found under N addition. Newly assimilated 13 C incorporated into POM increased in the rhizosphere under N and NP conditions, whereas MIN remained largely unaffected. 13 C-MBC proportion in the total microbial biomass C (MBC) pool revealed that N and NP stimulated microbial activity to a greater degree than P. The main portion of 13 C in the rhizosphere and bulk soil was found in POM on D14, which decreased over time due to microbial utilization. Contrastingly, root-derived 13 C in the MIN remained unchanged between sampling days, which indicates that the stabilization of rhizodeposits in this fraction might be the potential mechanism underlying SOM sequestration in paddy soils.