Front cover: Photo shows the conventional ridge tillage (rotary tillage), which is widely used by farmers in Northeast China to increase soil temperature. For this tillage all above-ground biomass is removed manually and moldboard plowed annually to 65 cm width and 20 cm depth by rotary tillage in the autumn, and soybean is then planted. In this issue, a study on the relationship between different tillage systems and the diversity and trophic functional groups of arthropod communities on the soil surface in the black soil region of Northeast China is reported (pp. 74-80). Photo by ZHANG Xing-Yi on 7 July, 2008 at an experimental field in Hailun city, Heilongjiang.