冬小麦不同生育期植株与土壤的硫素动态

Variation of sulfur (S) in plants of winter wheat and soil was investigated during growth stages.The samples were collected at the experimental station of Institute of Genetics,Chinese Academy of Sciences,Pingxifu,Changping,suburb of Beijing.Five plots were marked first,and then soil and plants with 4 growth stages at those plots were sampled and analyzed.The stages were:reviving,jointing,heading and maturing,respectively.The result showed that the content of S in plants varied with growth stages,and decreased significantly in shoots.For example,the decrease range was 75.6% from the reviving stage to the mature stage.However,the content of S in roots increased 38.9% from reviving to maturity stage.The distribution ratio (total S in shoots/total S in roots) of S in individual plant of winter wheat decreased gradually during the four stages.The conftent of total S in the soil has no big change but the available S in the soil decreased significantly during the growth stages.For example,the available S in the soil at the reviving stage was 27.3 mg·kg -1 ,but it is only 12.4 mg·kg -1 in the maturity stage.The total uptake of S in each plant had significant negative relationship with the available S in the soil.