CAJ | 학술논문

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-B복사증강작위전구배경문제지일,UV-B복사증강대전구물질순배산생적영향수도엄범적관주.위료평고지구은정농전생태계통영양원소재고해발화고 UV-B 복사배경하대 UV-B 복사적향응,재원양제전대전조건하,통과 2 년련속UV-B복사처리(0화5.0 kJ·m-2·d-1),원위연구저위도고해발구은정지속도전생태계통중전통수도(Oryza sativa)품충(월량곡-YLG화백각로갱-BJLJ)대P소화K소적군체루적특정급기이질성분배규률.결과표명:(1)2년련속UV-B복사,2개수도품충적협、경、근、자립화총생물량현저하강8.1%~61.3%.(2)제월량곡경중P루적량하강외,2개수도품충불동부위P함량、군체루적량화군체루적총량균표현출증가적추세,기중협편P루적량현저증가료39.0%~46.2%,자립P루적량현저증가료39.1%~66.7%.(3)2개수도품충적경화근K함량화군체루적량증가.제2012년백각로갱K총루적량강저외, UV-B복사도치K루적총량증가5.5%~28.2%.월량곡자립K루적량증가,백각로갱자립K루적량강저.총지,련속2년UV-B복사사전통수도품충대P화K소적군체루적증가,수도종협편P소대사、경간항성화충자영양저비등방면산생향응.
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.