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通过盆栽模拟试验,以玉米为供试植物,矿区退化土壤为供试基质,对盆栽玉米分别施加不同浓度的CaCl2(5,10,20,40,80mmol/L),研究了干旱胁迫下外源钙对矿区玉米生长和养分吸收的影响.结果表明:对矿区退化土壤上生长的玉米施加适当含量的外源钙,可显著提高玉米对养分的吸收,有利于玉米的生长.当施入CaCl2浓度小于20mmol/L时,玉米氮磷钾累积量随外源钙含量的增加而增加,且用浓度为20mmol/L的CaCl2处理显著提高了苗期玉米的生物量、叶片相对含水量和叶片叶色值(SPAD),玉米地上部分和根系部分氮磷钾累积量与其它处理差异性显著;当施入CaCl2浓度大于40mmol/L时,玉米氮磷钾累积量随着外源钙含量增加而降低;用浓度为80mmol/L的CaCl2处理抑制了玉米的生长,高含量的钙破坏了玉米离子动态平衡,对苗期玉米生长产生危害.
Pot experiments were conducted to investigate the effect of different concentrations of CaCl2 (5, 10, 20, 40, 80mmol / L) on the potted maize. The effects of exogenous Effects of Calcium on the Growth and Nutrient Absorption of Corn in the Mining Area The results showed that the application of the appropriate amount of exogenous calcium to the corn grown in the degraded soils of the mine area could significantly increase the nutrient absorption and promote the growth of the corn.When CaCl2 concentration When less than 20mmol / L, the accumulation of N, P and K in maize increased with the increase of exogenous calcium, and the biomass of maize at seedling stage was significantly increased by CaCl2 at the concentration of 20mmol / L, the relative water content of leaves and leaf color SPAD, the accumulation of N, P and K in the aerial part and root part of maize were significantly different from other treatments. When CaCl2 concentration was higher than 40mmol / L, the N, P accumulation in maize decreased with the increase of exogenous Ca2 + Treatment with CaCl2 at a concentration of 80 mmol / L inhibited the growth of maize, and the high content of Ca2 + destroyed the dynamic balance of maize ions, which was harmful to the growth of maize at seedling stage.