机械化保护性耕作对土壤理化性质的影响

机械化保护性耕作技术在山西临汾开展研究已经有多年了。在试验区，土壤物理化学性质发生了变化，这些变化给作物的生长提供了良好的土壤环境条件，同时改善了区域环境。通过对13年的保护性耕作试验区与传统土壤耕作技术试验区的对比试验，结果表明：机械化保护性耕作技术可更有效地提高土壤的蓄水量，每年蓄水量平均增加率为17％、每年土壤有机质平均增加0.065％，耕作层土壤的密度减小了10．07％，耕层内SO4^2-含量、Cl^-含量分别减少了11．045％和21．839％。图1，表4，参5。

Influence of Mechanized Conservation Tillage on Soil Physical and Chemical Properties

Mechanized conservation tillage technique has been studied in Linfen , Shanxi province for many years. The soil physical and chemical properties have been changed in test field and these variations have supplied crop with good environmental conditions of soil and have improved the regional environment. By comparison of 13 years conservative fanning test field and traditional farming field,it was found that mechanized conservation tillage technique can raise capacity of soil water storation more effectively. The average of annual growth rate of capacity of soil water storafion is 17 percent. The organic matter of soil has increased by 0.065 percent a year, the soil bulk density of plough layer has deceased by 10.07 percent, and the SO4^2- content and the Cl- content of plough layer have decreased by 11.045 percent and 21.839 percent respectively.