| Based on the field experiment and investigation,a new planting method called Stress Resistance Bag Technique(SRBT) was studied at the area of removal lands from cultivation for afforestation in the Loess Plateau where drought and rodent damage are the two key harmful factors in forestation.The results showed that SRBT can increase the survival rate of forestation by 16.82%～20.74%,the reserve rate of forestation by 34.97%～81.89% for Platycladus orientalis compared with normal planting(CK).And the effect was influenced by the position on slope.Upper slope was higher at the survival rate of forestation,but middle slope was higher at the reserve rate of forestation while using SRBT.The increment in youngling height and basal diameter were also impacted by SRBT and the bag size.The effect was better for big bag,35 cm in length and 28 cm in width than for small bag,35 cm in length and 22 cm in width.The increment was increased by 32.73% in height,4.14 times in basal diameter compared with CK.There was not significant difference in height increment but there was in basal diameter increment between upper slope and middle slope.The basal diameter increment was bigger at middle slope than that at upper slope.The effect of SRBT on improving the survival rate of forestation,the increment of youngling height and basal diameter were directly connected with the soil moisture in the root zone,which has been improved by the inner coating on the bags.The SRBT can alleviate the damage of rodent such as Myospalax cansus,Ochotona daurica,and Lepus capensis to young trees.Compared with CK,the rodent damage index were decreased by 34.48%～37.93%.There was not significant difference in bag size but there was some in different position of slope.The rodent damage index was lower at middle slope than that at upper slope. |