１试验区自然条件试验区位于海林林区，年均降水量５８０ｍｍ，干燥指数０．７，年平均气温２．７℃，＞１０℃的年积温２３２０℃，无霜期约１２０ｄ。土壤为典型的暗棕壤，黑土层厚度１５～２０ｃｍ，平均坡度７°，ＰＨ值为７，有机质含量＜２．２％。２试验材料及方法... 1 Experimental area The natural conditions test area is located in Hailin forest area. The average annual rainfall is 580mm, the drying index is 0.7, the annual average temperature is 2.7 ℃, the annual accumulated temperature is 2320 ℃ and the frost-free period is about 120d at> 10 ℃. The soil is a typical dark brown soil. The thickness of black soil is 15-20 cm with an average gradient of 7 °. The pH value is 7 and the organic matter content is less than 2.2%. 2 test materials and methods ...