湖南省几种主要菜园土铅的化学行为及其作物效应的初步研究

Preliminary Study on Chemical Behaviour of and Crop Response to Lead in Some Vegetable Soils in Huna Province

温度、ｐＨ、有机质及不同价态阳离子对铅吸持－解吸量有明显的影响．土壤中的铅在低浓度范围内（红茶园土为１００μｇ／ｇ，石灰性菜园土为５００μｇ／ｇ）对小白菜生长有刺激作用，超过一定浓度（红菜园土为≥５００μｇ／ｇ，石灰性莱园土为≥１００μｇ／ｇ）则有抑制作用．小白莱的含铅量随土壤铅浓度的增加而增加，两者呈极显著正相关．三种改良剂对铅污染土壤有明显的改良效果，其中以猪粪、石灰两种改良剂的效果为好，钙镁磷肥次之．

The study shows that temperature, pH, organic material and cations with with various charges evidently affect the adsorption-desorption of lead. The soil Pb,conoentration that stimulates cabbage growth is ≤100μg/g for red vegetable soil and≤500μg/g for calcareous vegetable soil. The soil Pb conentration that inhibits cabbage growth is≥500μg/g and≥100μg/g for red vegetable soil and for calcareous vegetable soil, respectively.The Pb content of cabbage plants increases with the for of Pb content of soil, and the relationship is very sibilant.￣ndiorants, pig￣are, for and caldum magneSium ibopbate, can sighCantlydecrease Pb content of cabbage plants, among them pig manure and lime are the better ones.