摘要
在土培条件下,模拟受三价铬(Cr)污染程度不同的土壤,研究了水稻一大麦(简称水旱轮作)与玉米一大麦(简称旱作连作)两种耕作制度对改良铬污染土壤的效果。结果表明,在Cr污染土壤上,无论从作物减产的临界浓度。作物体内铬残留量及作物收获后土壤有效铬含量,水旱轮作均优于旱作连作。初步提出选种适宜作物,实行水早轮作是轻度三价铬污染土壤上一项有效的生物改良措施。
The study was conducted by means of soil culture. The main results showed that planting of suitable crops and rotation of paddy rice and dryland crops are effective for the improvement of soil that is polluted lightly by trivalent chromium. The tolererance of crops to pollution of chromium can be distinguished by the threshold concentration that causes a significant reduction of yield and accumulation coefficient of the crops. The tolerance of crops on pollution of chromium is ordered as: rice > barley >maize. Rice and barley grow normally when the concentration of trivalent chromium in the soil is below 400ppm. Under this condition, the content of chromium in rice, barley did not exceed its concentration limit above which it became harmful to human and animal healtn.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1989年第3期231-235,共5页
Journal of Huazhong Agricultural University
关键词
水旱轮作
铬
污染
三价
土壤
chromium pollution
the rotation of paddy rice and dryland crops
