Meng Yan, Lou Yun-sheng, Wu Lei, Cui He-yang, Wang Wei-qing
Ying Yong Sheng Tai Xue Bao. 2015 Jan;26(1):25-31.
A pot experiment was conducted to investigate the effects of silicon supply on rice growth and methane (CH4) emission in paddy field under elevated UV-B radiation. The experiment was designed with two UV-B radiation levels, i.e. ambient UV-B (ambient, A) and elevated UV-B radiation (elevated by 20%, E) ; with four silicon supply levels, i.e., Si0 (control, without silicon), Si2 (as sodium silicate, 100 kg SiO2 . hm-2), Si2 (as sodium silicate, 200 kg SiO2 hm-2) and Si3 (as slag fertilizer, 200 kg SiO2 . hm-2). The results indicated that, silicon supply obviously alleviated the depressive effect of elevated UV-B radiation on rice growth, and increased the tiller numbers, chlorophyll content, and shoot and root dry masses. Silicon supply promoted rice growth, which increased with the silicon supply level (sodium silicate). Slag fertilizer was better than*sodium silicate in promoting rice growth. CH4 flux and accumulated CH4emission were obviously increased by elevated UV-B radiation, but significantly decreased by silicon application. CH4 emission was reduced with increasing the silicon supply level. Under the same silicon supply level, slag fertilizer was better than sodium silicate in inhibiting CH4 flux and accumulated CH4 emission. This research suggested that fertilizing slag in rice production was helpful not only in utilizing industrial wastes, but also in significantly mitigating CH4 emissions in rice paddy under elevated UV-B radiation.
通过盆栽试验研究了在增强UV-B辐射条件下，硅供应对稻田水稻生长及甲烷（CH4）排放的影响。试验设计了两个UV-B辐射水平，即环境UV-B（对照，A）和增强UV-B辐射（增强20%，E）；以及四个硅供应水平，即Si0（对照，不施硅）、Si2（硅酸钠，100 kg SiO2·hm-2）、Si2（硅酸钠，200 kg SiO2·hm-2）和Si3（矿渣肥料，200 kg SiO2·hm-2）。结果表明，硅供应明显缓解了增强UV-B辐射对水稻生长的抑制作用，增加了分蘖数、叶绿素含量以及地上部和根部干质量。硅供应促进了水稻生长，且随硅供应水平（硅酸钠）的增加而增强。在促进水稻生长方面，矿渣肥料优于硅酸钠。增强UV-B辐射显著增加了CH4通量和CH4累积排放量，但施硅显著降低了二者。CH4排放随硅供应水平的增加而减少。在相同硅供应水平下，矿渣肥料在抑制CH4通量和CH4累积排放方面优于硅酸钠。该研究表明，水稻生产中施用矿渣肥料不仅有助于工业废弃物的利用，还能显著减轻增强UV-B辐射条件下稻田的CH4排放。
