Open AccessEffects of silicate application on CH 4 and N 2 O emissions and global warming potentials in paddy soil under enhanced UV ‐B radiation
Author(s) -
Lou Yunsheng,
Ren Lixuan,
Zhao Sidi,
Shi Yifan,
Zhang Yiwei,
Zhu Huaiwei
Publication year - 2019
Publication title -
energy science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 29
ISSN - 2050-0505
DOI - 10.1002/ese3.390
Subject(s) - silicate , ozone depletion , ozone , chemistry , environmental chemistry , radiation , ozone layer , ultraviolet , irradiation , materials science , physics , optoelectronics , organic chemistry , quantum mechanics , nuclear physics
Abstract Enhanced ultraviolet‐B ( UV ‐B) radiation is induced by the depletion of the stratospheric ozone layer. Silicate is beneficial to rice growth and can increase the resistance of rice plant to UV ‐B radiation, but so far few reports have been available on whether silicate application can reduce CH 4 and N 2 O emissions from paddy soils under enhanced UV ‐B radiation. A field experiment was conducted to investigate the effects of silicate application on CH 4 and N 2 O emissions and global warming potentials ( GWP s) under enhanced UV ‐B radiation in a paddy soil. The experiment with rice was designed with two UV ‐B radiation levels, that is, ambient UV ‐B (A, ambient) and enhanced UV ‐B radiation (E, enhanced by 20%); and two silicate application levels, that is, control (Si0, 0 kg SiO 2 ·ha −1 ) and silicate application (Si1, 200 kg SiO 2 ·ha −1 ). CH 4 and N 2 O fluxes were determined by closed chamber method at one‐week interval during rice growth period. The results show that, compared with ambient UV ‐B radiation, enhanced UV ‐B radiation clearly decreased the dry matter weights of shoot, root, and whole plant by 13.12%, 53.31%, and 25.85%, respectively, in the treatment without silicate application, and by 1.47%, 34.49%, and 11.12%, respectively, in the treatment with silicate application. Enhanced UV ‐B radiation significantly increased the flux and cumulative emission of N 2 O and stimulated the GWP s of CH 4 and N 2 O. Silicate application significantly reduced flux and cumulative emission of CH 4 , promoted the flux and cumulative emission of N 2 O, and reduced the GWP s of CH 4 and N 2 O. This study suggests that silicate application can reduce the contribution of enhanced UV ‐B radiation to global warming potentials.