Research
Nitrogen addition affects chemical compositions of plant tissues, litter and soil organic matter
| Title: | Nitrogen addition affects chemical compositions of plant tissues, litter and soil organic matter | ||||||
| First Author: | Liu, Jun | ||||||
| Publication Name: | ECOLOGY | ||||||
| Year Publised: | 2016 | ||||||
| Abstract: | Increasing nitrogen (N) deposition or fertilization has been found to significantly affect carbon (C) cycling. However, a comprehensive understanding of how different C chemical components of plant, litter, and soil would respond to external N addition is still lacking. We compiled data of 1,160 observations from 52 individual studies and conducted a meta--analysis of N addition effects on 18 variables related to C chemical compositions in terrestrial ecosystems. Results showed that plant lignin (+7.13%), plant protein (+25.94%), and soil lignin (+7.30%) were significantly increased by N addition, and plant hemicellulose (-4.39%) was significantly decreased, whereas plant fiber, plant cellulose, plant non-structural carbohydrate (NSC), litter lignin, and litter cellulose were not significantly changed. The effects of N addition on C chemical composition varied among different ecosystems/plant types and different forms of N addition. Increasing treatment duration did not significantly change the effects of N addition on the chemical composition of plant, litter, and soil C. With increasing Naddition rate, the effect of N addition on plant lignin, plant fiber, plant cellulose, and plant protein increased, while the effect of N addition on planthemicellulose, plant NSC, and litter cellulose became more negative. Our meta--analysis provided a systematic evaluation of the responses of different Cchemical components to N addition in the plant-litter-soil continuum. Results suggest that the change of plant and soil C chemical composition under Naddition may be beneficial for ecosystem C sequestration and could affect ecosystem structure and function in the future. | ||||||
| Text Link: | http://onlinelibrary.wiley.com/doi/10.1890/15-1683.1/full | ||||||
| IF: | 4.733 | ||||||