煤矿塌陷区造田复土中粉煤灰含量对高羊茅生理功能的影响

以小区试验进行了粉煤灰复土造田种植高羊茅的试验 .对高羊茅生长发育、生理功能和矿质积累的研究结果表明 :含 30 %以下粉煤灰复合土能提高高羊茅植株光合作用和氮素利用能力 ,促进植株生长 ,不会对植株产生伤害 ;当复合土中粉煤灰含量达 4 0 %时 ,高羊茅光合作用、蒸腾作用和氮素利用能力降低 ,细胞膜脂质过氧化水平升高 ,膜透性增大 ,SOD、POD和CAT活性降低 ,植株生长被抑制 ;随着复合土中粉煤灰含量的升高高羊茅植株Mn、Zn、Ca、Mg的质量分数升高 ,Cu的质量分数无显著变化 .研究建议粉煤灰复土造田以 30 %粉煤灰复合土为宜 .图 3表 6参 19

EFFECT OF COAL FLY ASH IN RECLAIMED SOIL ON PHYSIOLOGICAL FUNCTIONS OF FESTUCA ARUNDINACEA (TALL FESCUE) IN MINE SUBSIDED AREA

Through filling the mine subsided area with coal fly ash and covering with 60 cm compound soil mixed with coal fly ash, the physiological functions and mineral element contents of Festuca arundinacea grown in reclaimed area with coal fly ash were studied. The compound soil containing less than 30% coal fly ash enhanced the photosynthesis rate and nitrogen utilization, and promoted the growth of tall fescue plants without any harmful effects. When the content of coal fly ash in the compound soil increased to 40%, the rate of photosynthesis, transpiration and the ability of nitrogen utilization decreased, the degrees of cell membrane lipid peroxidation and membrane electrolyte leakage increased, SOD, POD and CAT activities decreased, and plant growth was restrained. The mass fraction of Mn, Zn, Ca, Mg in tall fescue plants were increased as coal fly ash content in compound soil increased, but the Cu mass fraction showed no significant changes. The compound soil containing about 30% of coal fly ash may be recommended for land reclaimation in these areas. Fig 3, Tab 6, Ref 19