摘要
UV-B 辐射增强作为全球环境问题之一,UV-B 辐射增强对全球物质循环产生的影响受到广泛的关注.为了评估持久稳定农田生态系统营养元素在高海拔和高UV-B 辐射背景下对UV-B 辐射的响应,在元阳梯田大田条件下,通过2 年连续UV-B 辐射处理（0 和5.0 kJ·m^-2·d^-1）,原位研究低纬度高海拔区稳定持续稻田生态系统中传统水稻（Oryza sativa）品种（月亮谷-YLG 和白脚老粳-BJLJ）对P 素和K 素的群体累积特征及其异质性分配规律.结果表明：（1）2 年连续UV-B 辐射,2个水稻品种的叶、茎、根、籽粒和总生物量显著下降8.1%-61.3%.（2）除月亮谷茎中P 累积量下降外,2 个水稻品种不同部位P 含量、群体累积量和群体累积总量均表现出增加的趋势,其中叶片P 累积量显著增加了39.0%-46.2%,籽粒P 累积量显著增加了39.1%-66.7%.（3）2 个水稻品种的茎和根K 含量和群体累积量增加.除2012 年白脚老粳K 总累积量降低外,UV-B 辐射导致K 累积总量增加5.5%-28.2%.月亮谷籽粒K 累积量增加,白脚老粳籽粒K 累积量降低.总之,连续2 年UV-B辐射使传统水稻品种对P 和K 素的群体累积增加,水稻从叶片P 素代谢、茎秆抗性和种子营养储备等方面产生响应.
UV-B radiation, which is one of environmental problem, has influenced ecosystem and human health. UV-B radiation has been paid more and more attention due to its influencing on material cycle. It is important to evaluate the responses of stable agricultural ecosystem to enhanced UV-B radiation, which located in area with high elevation and background UV-B. Field experiments were conducted to understand effects of two-year concessional UV-B radiation (0 and 5.0 kJ·m-2·d-1) on P and K accumulation and heterogeneous distribution of two traditional rice (Oryza sativa)varieties (BJLJ and YLG) in-situ Yuanyan terraces, Yunnan Province. The results showed that (1) Under two-year concessional enhanced UV-B radiation, biomass of leaves, stem, root and grain of two rice varieties decreased by 8.1%~61.3%; (2) Expect for P accumulation of stem of YLG, P contents and accumulation of leaves, stem, root, grain of two rice varieties increased with P accumulation of leaves and grain increased by 39.0%~46.2% and 39.1%~66.7%, respectively; (3) K accumulation of stem and root of two rice varieties increased. Except for total K accumulation of BJLJ in 2012, K accumulation increased by under enhanced UV-B radiation 5.0 kJ·m-2·d-1treatment. Therefore, P and K accumulation of traditional rice varieties increased with enhanced UV-B radiation. The responses of traditional rice varieties to enhance UV-B radiation are assumed on P accumulation in leaves, stem resistance and grain nutrients reserve.
出处
《生态环境学报》
CSCD
北大核心
2015年第8期1259-1265,共7页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(31460141
41205113
31060083)
作者简介
祖艳群（1966年生）,女,教授,博士,主要从事环境生态学方面的教学与科研工作.E-mail：zuyanqun03@aliyun.com
E-mail：liyuan@ynau.edu.cn
