摘要:
为了回答温度升高是否会改变痕量元素在土壤中的溶解性，以及作物对痕量元素的生物利用率，在人工气候室模拟未来气候变化温度升高背景下，对种植在不同温度处理的3种春小麦，测定了籽粒中Cd，Cu，Fe和Zn含量。结果发现温度升高引起了土壤中Cd，Cu，Fe和Zn溶解性的显著变化，也显著地影响小麦籽粒中Cd，Cu，Fe和Zn的生物利用率。最高升温3℃处理使西旱1号、2号和3号小麦籽粒中Cd浓度相比对照分别下降43.4%、11.1%和13.4%，Cu浓度相比对照处理分别下降了30.4%、25.1%和10.8%。但Fe和Zn的情况却不同，1℃和2℃升温处理使西旱1号籽粒中Zn浓度比对照处理分别增加了28.9%和35.8%。根据未来气候变化西北地区温度升高1.9℃，估计到2050年，小麦籽粒中的质量分数范围分别在Cd(0.59-0.65)、Cu(5.91-7.64)、Zn(63.73-69.41)和Fe(185.23-202.70) mg/kg。
关键词:
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温度
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痕量元素
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气候变化
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春小麦
Abstract:
The objective of this study was to investigate the effect of temperature raising on solubility of trace elements in soil, and the bioavailability of trace elements in spring wheat (Triticum aestivum L.) A simulated warming manipulation was conducted to evaluate the effect of temperature raising on Cd, Cu, Fe and Zn accumulation of spring wheat in Dingxi, Gansu province, the semiarid northwest of China. The results of the study revealed that temperature raising will lead to a significant change in trace element concentration in soil and spring wheat. Compared with control, the strongest effects of 3℃ temperature raising were that the trace elements concentrations in grain of Xihan 1, Xihan 2 and Xihan 3 decreased by 43.4%, 11.1% and 13.4% on Cd, and 30.4%, 25.1% and 10.8% on Cu, respectively. But it was converse for the concentrations of Fe and Zn in grain of spring wheat, the concentration of Zn increased by 28.9% and 35.8% respectively in grain of Xihan under 1℃ and 3℃temperature raising treatments. According to the change of temperature raising with 1.9℃ by 2050 in semiarid northwestern of China, the elements concentrations in spring wheat will be in a range of Cd (0.59-0.65 mg/kg), Cu (5.91-7.64 mg/kg), Zn (63.73-69.41 mg/kg) and Fe (185.23-202.70 mg/kg), respectively.
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