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| 1 | Effect of elevated [CO_2] and nutrient management on wet and dry season rice production in subtropical India显示文摘The present experiment was conducted to evaluate the effect of elevated [CO_2] with varying nutrient management on rice–rice production system. The experiment was conducted in the open field and inside open-top chambers(OTCs) of ambient [CO_2](≈ 390 μmol L-1) and elevated [CO_2] environment(25% above ambient) during wet and dry seasons in 2011–2013at Kharagpur, India. The nutrient management included recommended doses of N, P, and K as chemical fertilizer(CF), integration of chemical and organic sources, and application of increased(25% higher) doses of CF. The higher [CO_2] level in the OTC increased aboveground biomass but marginally decreased filled grains per panicle and grain yield of rice, compared to the ambient environment. However, crop root biomass was increased significantly under elevated [CO_2]. With respect to nutrient management, increasing the dose of CF increased grain yield significantly in both seasons. At the recommended dose of nutrients, integrated nutrient management was comparable to CF in the wet season, but significantly inferior in the dry season, in its effect on growth and yield of rice. The [CO_2] elevation in OTC led to a marginal increase in organic C and available P content of soil, but a decrease in available N content. It was concluded that increased doses of nutrients via integration of chemical and organic sources in the wet season and chemical sources alone in the dry season will minimize the adverse effect of future climate on rice production in subtropical India. | Sushree Sagarika Satapathy Dillip Kumar Swain Surendranath Pasupalak Pratap Bhanu Singh Bhadoria | 2015 | The Crop Journal2015，3，6： | 0 |
| 2 | Elevated CO_(2) increases soil redox potential by promoting root radial oxygen loss in paddy field显示文摘Soil redox potential(Eh)plays an important role in the biogeochemical cycling of soil nutrients.Whereas its effect soil process and nutrients'availability under elevated atmospheric CO_(2) concentration and warming has seldom been investigated.Thus,in this study,a field experiment was used to elucidate the effect of elevated CO_(2) concentration and warming on soil Eh,redox-sensitive elements and root radial oxygen loss(ROL).We hypothesized elevated CO_(2) and warming could alter soil Eh by promoting or inhibiting ROL.We found that soil Eh in the rhizosphere was significantly higher than that of non-rhizosphere.Elevated CO_(2) enhanced soil Eh by 11.5%,which corresponded to a significant decrease in soil Fe^(2+)and Mn^(2+)concentration.Under elevated CO_(2),the concentration of Fe^(2+)and Mn^(2+)decreased by 14.7%and 13.7%,respectively.We also found that elevated CO_(2) altered rice root aerenchyma structure and promoted rice root ROL.Under elevated CO_(2),rice root ROL increased by 79.5%and 112.2%for Yangdao 6 and Changyou 5,respectively.Warming had no effect on soil Eh and rice root ROL.While warming increased the concentration of Mn^(2+)and SO_(4)^(2-)by 4.9%and 19.3%,respectively.There was a significant interaction between elevated CO_(2) and warming on Fe^(2+)and Mn^(2+).Under elevated CO_(2),warming had no effect on the concentration of Fe^(2+)but decreased Mn^(2+)concentration significantly.Our study demonstrated that elevated atmospheric CO_(2) in the future could increase soil Eh by promoting rice root ROL,which will alter some soil nutrients'availability,such as Fe^(2+)and Mn^(2+). | Jie Li Han Zhang Wenyi Xie Cheng Liu Xiaoyu Liu Xuhui Zhang Lianqing Li Genxing Pan | 2024 | Journal of Environmental Sciences2024，，2： | 0 |
| 3 | 大气CO_(2)浓度增加和升温对不同品种水稻根系形态的影响显示文摘[目的]本文旨在研究大气CO_(2)浓度增加和升温对不同品种水稻根系形态的影响。[方法]在田间开放条件下模拟大气CO_(2)浓度增加和升温,设置CT(对照,CO_(2)浓度和温度与正常大气环境保持一致)、C+T(大气CO_(2)浓度增加200μmol·mol-1)、CT+(冠层温度升高2℃)和C+T+(大气CO_(2)浓度和温度同时升高)4个处理。每个处理种植‘扬稻6号’和‘常优5号’2个品种,连续开展2年(2020、2021年)田间试验。在水稻分蘖期、灌浆期和成熟期采集地上部和根系样品,分析大气CO_(2)浓度增加、升温及其交互作用对地上部干重、根干重、根冠比和根系形态(根长、根直径、根表面积、根体积和根尖数)的影响。[结果]大气CO_(2)浓度增加显著提高不同生育期‘扬稻6号’和‘常优5号’地上部干重、根干重和根冠比,其中‘常优5号’的增加幅度大于‘扬稻6号’。大气CO_(2)浓度增加显著提高不同生育期‘扬稻6号’根长、根直径、根体积、根表面积和根尖数,分别提高了20.5%~25.8%、9.0%~12.3%、20.1%~47.3%、47.1%和23.0%~40.2%。‘常优5号’根长、根体积、根表面积和根尖数分别提高18.1%~22.7%、19.2%~68.1%、12.6%~65.2%和13.5%~44.3%。升温抑制了不同生育期‘扬稻6号’和‘常优5号’地上部干重、根干重和根冠比。升温显著降低不同生育期‘扬稻6号’根长、根体积、根表面积和根尖数,分别降低了9.7%~20.1%、15.8%~28.2%、22.0%~27.3%和13.8%~28.7%。‘常优5号’根长、根直径、根表面积和根尖数分别下降了31.4%~32.0%、8.6%、19.6%、18.0%~19.7%。大气CO_(2)浓度增加和升温对‘扬稻6号’和‘常优5号’不同生育期的根系形态和水稻生长存在显著的交互作用。[结论]大气CO_(2)浓度增加促进水稻生长和根系形态发育,升温抑制水稻生长和根系形态发育。大气CO_(2)浓度增加和升温交互作用抑制水稻生长和根系形态。 | 李婕 周泽源 刘成 刘晓雨 李恋卿 潘根兴 | 2023 | 南京农业大学学报2023，46，1： | 0 |
| 4 | From Chinese Science Bulletin to Science Bulletin: celebrate the coming 50th birthday显示文摘As the only multidisciplinary journal supervised by Chinese Academy of Sciences and the National Natural Science Foundation of China,Science Bulletin will usher in its50th anniversary in 2016.A fifty-year history for a journal is always remarkable.However,the more important reason to celebrate besides the great age is:the fifty-year old journal continues to be vigorous and influential. | Xuming Jia Rui An Xiao-Ya Chen | 2015 | Science Bulletin2015，60，24： | 0 |
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