首页关于本刊影响因子及获奖投稿须知订阅及广告专辑与专题学术会议绿色发表通道优秀论文 
肇思迪,娄运生,张祎玮,朱怀卫,石一凡.UV-B增强下施硅对稻田CH4和N2O排放及其增温潜势的影响.生态学报,2017,37(14):4715~4724 本文二维码信息
二维码(扫一下试试看!)
UV-B增强下施硅对稻田CH4和N2O排放及其增温潜势的影响
Effect of silicate supply on CH4 and N2O emissions and their global warming potentials in a Chinese paddy soil under enhanced UV-B radiation
投稿时间:2016-04-11  
DOI: 10.5846/stxb201604110661
关键词UV-B辐射  施硅  水稻  甲烷  氧化亚氮
Key WordsUV-B radiation  silicate supply  rice  methane  nitrous oxide
基金项目国家自然科学基金(41375159);江苏省自然科学基金(BK20131430)
作者单位E-mail
肇思迪 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室, 南京 210044  
娄运生 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室, 南京 210044 yunshlou@163.com 
张祎玮 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室, 南京 210044  
朱怀卫 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室, 南京 210044  
石一凡 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室, 南京 210044  
摘要点击次数 105
全文下载次数 69
摘要:
大气平流层臭氧损耗导致的地表紫外辐射增强作为全球变化重要问题之一,受到广泛关注。硅是水稻生长有益元素,但施硅是否影响稻田CH4和N2O排放,迄今相关报道尚不多见。通过大田试验,研究UV-B增强下施硅对水稻生长、稻田甲烷(CH4)和氧化亚氮(N2O)排放及其增温潜势的影响。UV-B辐照设2水平,即对照(A,自然光)和增强20%(E);施硅量设2水平,即对照(Si0,0 kg SiO2/hm2)和施硅(Si1,200 kg SiO2/hm2)。结果表明,UV-B增强降低了成熟期水稻地上部和地下部生物量,而施硅能缓解UV-B增强对水稻生长的抑制作用,使水稻地上部和地下部生物量增加。UV-B增强可显著提高稻田CH4和N2O排放通量和累积排放量,增加稻田CH4和N2O排放的综合增温潜势。施硅能明显降低稻田CH4排放,促进N2O排放,降低稻田CH4和N2O排放的综合增温潜势。研究表明,施硅显著降低稻田CH4和N2O的全球增温潜势,缓解UV-B增强对稻田CH4和N2O的全球增温潜势的促进作用。
Abstract:
Enhanced ultraviolet-B (UV-B) radiation, one of the most important problems caused by global climate change, is induced by the depletion of the stratospheric ozone layer and has received considerable attention worldwide. It has resulted in damage to various plant processes, including growth inhibition, photosynthetic depression, lipid peroxidation, and ultra-structural change, and this has led to crop yield reductions. Methane (CH4) and nitrous oxide (N2O) are two potent greenhouse gases, and have 21 and 310 times higher global warming potentials (GWP), respectively, than CO2 on a 100-year time scale. N2O is the most important ozone-depleting substance in the 21st century, and paddy fields are regarded as one of the most important biological sources of N2O and CH4. Silicate is beneficial to rice growth, but so far there have been few reports on whether silicate application can reduce CH4 and N2O emissions from paddy soils. A field experiment was conducted to investigate the effects of silicate application on CH4 and N2O emissions and their GWPs in a Chinese paddy soil under enhanced UV-B radiation. The experiment had two UV-B radiation levels, i.e. ambient UV-B (A, ambient) and enhanced UV-B radiation (E, enhanced by 20%); and two silicate application levels, i.e. a control (Si0, 0 kg SiO2/hm2) and added silicate (Si1, 200 kg SiO2/hm2). The experiment was undertaken at the Station of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing, China. The emission fluxes for CH4 and N2O were determined by the closed chamber method at one-week intervals during the rice growing period. The results showed that, compared to ambient UV-B radiation, enhanced UV-B radiation decreased the shoot, root, and whole rice plant dry matter weights at the maturity stage by 13.12%, 53.31%, and 25.85%, respectively, in the no silicate treatment; and by 1.47%, 34.49%, and 11.12%, respectively, in the added silicate treatments. Therefore, enhanced UV-B radiation clearly depressed rice growth, but supplying silicate could significantly alleviate the depressive effect of enhanced UV-B radiation on rice growth. Enhanced UV-B radiation significantly increased CH4 flux and its accumulated emissions, whereas supplying silicate significantly reduced CH4 flux and its accumulated emissions. In the treatments without adding silicate, enhanced UV-B radiation significantly increased CH4 accumulated emissions at the tillering stage, jointing-booting stage, heading-flowering stage, grain filling-maturity stage, and over the whole growth period by 101.65%, 63.12%, 13.96%, 3.94%, and 89.43%, respectively, over that under the ambient UV-B radiation. Under enhanced UV-B radiation, adding silicate significantly decreased CH4 accumulated emissions by 35.83%, 45.96%, 39.84%, 10.29%, and 38.41%, respectively. Enhanced UV-B radiation also significantly increased N2O flux and its accumulated emission levels. In the treatments with no additional silicate, enhanced UV-B radiation significantly increased N2O accumulated emission levels at the tillering stage, jointing-booting stage, heading-flowering stage, grain filling-maturity stage and over the whole growth period by 69.89%, 41.62%, 134.57%, 84.46%, and 73.69%, respectively, over those under the ambient UV-B radiation. The effects of silicate supply on N2O emissions from the paddy soil changed depending on the rice growth stage. Under enhanced UV-B radiation, supplying silicate significantly reduced N2O accumulated emissions at the tillering stage and heading-flowering stage by 16.57% and 32.97%, respectively, but increased N2O accumulated emissions at the jointing-booting stage, grain filling-maturity stage, and over the whole growth period by 68.06%, 23.09%, and 29.53%, respectively. It also significantly increased the global warming potentials (GWPs) of CH4 and N2O by 51.92% to 83.31%, respectively. Supplying silicate significantly reduced the GWPs of CH4 and N2O by 1.19% to 18.10%, respectively. In conclusion, enhanced UV-B radiation significantly increased N2O flux and its accumulated emissions, and stimulated the GWPs of CH4 and N2O. Silicate application significantly reduced CH4 flux and its accumulated emissions, promoted N2O flux and accumulated emissions, and reduced the GWPs of CH4 and N2O. This study suggests that silicate application can reduce CH4 and N2O emissions and subsequent GWPs, and reduce the contribution of enhanced UV-B radiation to global warming potentials.
HTML 查看全文   查看/发表评论  下载PDF阅读器

您是本站第 63263781 位访问者

Copyright © 2005-2019   京ICP备06018880号
地址:北京海淀区双清路18号
  邮编:100085    电话:010-62941099
  E-mail : shengtaixuebao@rcees.ac.cn
本系统由北京勤云科技发展有限公司提供技术支持