粉煤灰复合土种植小叶锦鸡儿生理功能研究

将粉煤灰与土壤混合形成复合土，利用盆栽试验研究了复合土种植小叶锦鸡儿的生长发育和生理功能。研究表明，含粉煤灰10％～30％的复合土能提高小叶锦鸡儿萌发种子中蛋白酶和淀粉酶活性，加速蛋白质、淀粉的分解，提高萌发种子的呼吸速率，为胚的生长发育提供了充足的物质和能量，使种子萌发速率加快。在苗期生长阶段，含粉煤灰10％～30％的复合土通过提高植株的光合作用，增强光能利用能力，加快碳源积累速度；改善根系活力，提高根系对营养物质的吸收；提高硝酸还原酶的活性，增强氮素的同化能力；增强植株的保水能力，提高水分利用效率进而提高植株的生长速率。总之，粉煤灰通过改善小叶锦鸡儿萌发种子和植株的生理功能而促进小叶锦鸡儿生长。复合土中粉煤灰含量达40％时，小叶锦鸡儿的种子萌发代谢和植株生长代谢被抑制，生长发育速度降低。研究建议粉煤灰复土造田以30％粉煤灰复合土为宜。

Physiological Functions of C.microphylla Growing in Compound Soils with Coal Fly Ash

To provide scientific evidences fo r reclaimed land with coal fly ash and ecological reconstruction in mine s ubside zone,we mixed soils with various amounts of coal fly ash to constitute compound so ils and studied the effects of compou nd soils on growth and physiological functions of C.microphylla using pot culture experiments.The r esults showed that:firstly,during seed germination,the compound soils receiving less th an 30%coal fly ash increased the activities of protease,diastase and respiration rate,accelerated the decomposing of protein and starc h,thus enough substance and energy were provided for the embryo' s growth and development,resulting in seeds germination rate increasing.Secondly,during plant s growth,the compound soils receiving less than 30%coal fly ash increased the photosynthesis of plants,activities of roots,nitrate reductase activities of plants and decreased transpiration rate.The increasing of photosynthetic ra te and roots activities resulted in i ncrease of light energy utilization,carbon accumulation and nourishment assimilation of roots r espectively,while the enhancement of nitrate reductase activity of pla nts brought about the ac-celeration of nitrogen assimilatio n,and the decreasing transpiration rate brought on the increasing of water utilization efficiency and water conservation.So the rate of pl ants' growth was increased.Our test indic ated soils mixed with coal fly ash has improved phys-iological functions of C.microphylla seeds and plants.Our studies demonstrated that the content of coal fly ash in compound soils amounted to 40%,seeds germination a nd seedlings' growth metabolism of C.microphylla were restrained,and rates of plants' growth and development were decreased.Therefore,it is recommended that the compound soils contained about 30%coal fly ash be used in land reclaimed in mine subsid e areas.