The Litter Reserves and Their Water Retaining Capacity of Artificial Fraxinus mandchurica Plantation Pure Stand and Mixed Stand

Through the litter amount survey and the water holding characteristic experiment of the litter under four kinds of forest( pure forest of Fraxinus mandchurica,mixed forest of Fraxinus mandchurica and Larix,mixed forest of Fraxinus mandchurica and Pinus koraiensis,mixed forest of Fraxinus mandchurica and Picea koraiensis) in Maoershan experimental farm of Northeast Forestry University in eastern Heilongjiang Province. The result shows that the litter amount under mixed forest of Fraxinus mandchurica and Pinus koraiensis( MFFP1) is the maximum( 11. 2 t/hm2),the second is pure forest of Fraxinus mandchurica( PFF)( 9. 7 t/hm2),the third is mixed forest of Fraxinus mandchurica and Larix( MFFL)( 9. 3 t / hm2),the fourth is mixed forest of Fraxinus mandchurica and Picea koraiensis( MFFP2)( 7. 6 t/hm2). The maximum water holding capacity of litter in PFF,MFFP1,MFFP2 and MFFL are 21. 7 mm,21. 6 mm,16. 4 mm,16. 1 mm respectively. The litter layers of PFF and MFFP1 have the better water- holding capacity than MFFP2 and MFFL in Maoershan experiment farm of Northeast Forestry University in eastern Heilongjiang Province.