Comparative analyses were conducted on the nutrient element content and returning amount of main fractional compositions of litter in Korean pine (KP), Mongolian Scots pine(MSP) and Dahurian larch (DL) plantations in ...Comparative analyses were conducted on the nutrient element content and returning amount of main fractional compositions of litter in Korean pine (KP), Mongolian Scots pine(MSP) and Dahurian larch (DL) plantations in Laoshan Plantation Experiment Station of Maoershan Experiment Forest Farm of Northeast Forestry University. The results are as follows: (1) The nutrient element content and returning amount in litter varies among different fractional compositions and tree species, the total returning amount of all nutrient elements and the returning amount of K, Ca, Mg, N and P are DL>MSP>KP, the returning amount of Cu is DL>KP>MSP, the returning amount of Fe and Mn are MSP>DL>KP, (2) To KP and DL plantations, the main nutrient element returned is dead needles; dead branches, bark scales and dead cones account for a little proportion; whereas to MSP plantation, besides dead needles,dead branches and bark scales also play an important role in the return of nutrient elements; (3)A little deal of dead leaves can provided a great deal of returning amount of nutrient elements.展开更多
The pine sawfly (Acantholyda posticalis Matsumura) is a serious pest of Pinus sylvestris; P. tabulaeformis and P. koraiensis. Chemical control has been generally applied, but caused a lot of problems. We first found F...The pine sawfly (Acantholyda posticalis Matsumura) is a serious pest of Pinus sylvestris; P. tabulaeformis and P. koraiensis. Chemical control has been generally applied, but caused a lot of problems. We first found Formica fukaii (new record in China). The ants nesting on Carex sp. preying on pine sawflics is an important predator. When nests are removed on purpose, the ant's behavior is normal and the nest are expanded. It is a dominant species and a natural enemy of pine sawfly in Nehe County.展开更多
The plantations of korean pine (Pinus koraensis) and scots pine (Pinus sylvesris var. mongolica) are mainly pure stands. Fires are gradually causing problems in these plantations and being paid much more attention rec...The plantations of korean pine (Pinus koraensis) and scots pine (Pinus sylvesris var. mongolica) are mainly pure stands. Fires are gradually causing problems in these plantations and being paid much more attention recently. Study on the influence of fire on trees and the adaptation to fire, therefore, is of great important to probe the fire ecological properties and the protection ways of these two species. The results are as follows: Both of the species are easily damaged by fire, but korean pine is more susceptible. In the same fire, korean pine is damaged more seriously than scots pine although they have the same size. Young individuals have low fire resistant capacity and can be damaged seriously, and older ones have strong fire resistance and can be damaged lightly. Up-hill fire makes a serious damage to the trees distributed in up-slopes with the reason of higher fire intensity. Down -hill fire makes a serious damage to the trees distributed in down-slopes with the reason of higher fire severity. The larger deocambium area in the tree bark is, the earlier tree growth after fire is. During the early growth stage, the damaged tree bark will Spill over much resin. The height of running resin is higher than that of dead cambium. Damaged trees sprout and grow more slowly and the length of leaves are shorter than these normal trees. The chiorophyll content of serious damaged trees is much higher than that of normal trees. The chiorophyll content of dying trees is 64. 29% higher than that of the contrast ones. Cell membrance penetrability of damaged trees is also higher than that of normal trees.展开更多
文摘Comparative analyses were conducted on the nutrient element content and returning amount of main fractional compositions of litter in Korean pine (KP), Mongolian Scots pine(MSP) and Dahurian larch (DL) plantations in Laoshan Plantation Experiment Station of Maoershan Experiment Forest Farm of Northeast Forestry University. The results are as follows: (1) The nutrient element content and returning amount in litter varies among different fractional compositions and tree species, the total returning amount of all nutrient elements and the returning amount of K, Ca, Mg, N and P are DL>MSP>KP, the returning amount of Cu is DL>KP>MSP, the returning amount of Fe and Mn are MSP>DL>KP, (2) To KP and DL plantations, the main nutrient element returned is dead needles; dead branches, bark scales and dead cones account for a little proportion; whereas to MSP plantation, besides dead needles,dead branches and bark scales also play an important role in the return of nutrient elements; (3)A little deal of dead leaves can provided a great deal of returning amount of nutrient elements.
文摘The pine sawfly (Acantholyda posticalis Matsumura) is a serious pest of Pinus sylvestris; P. tabulaeformis and P. koraiensis. Chemical control has been generally applied, but caused a lot of problems. We first found Formica fukaii (new record in China). The ants nesting on Carex sp. preying on pine sawflics is an important predator. When nests are removed on purpose, the ant's behavior is normal and the nest are expanded. It is a dominant species and a natural enemy of pine sawfly in Nehe County.
文摘The plantations of korean pine (Pinus koraensis) and scots pine (Pinus sylvesris var. mongolica) are mainly pure stands. Fires are gradually causing problems in these plantations and being paid much more attention recently. Study on the influence of fire on trees and the adaptation to fire, therefore, is of great important to probe the fire ecological properties and the protection ways of these two species. The results are as follows: Both of the species are easily damaged by fire, but korean pine is more susceptible. In the same fire, korean pine is damaged more seriously than scots pine although they have the same size. Young individuals have low fire resistant capacity and can be damaged seriously, and older ones have strong fire resistance and can be damaged lightly. Up-hill fire makes a serious damage to the trees distributed in up-slopes with the reason of higher fire intensity. Down -hill fire makes a serious damage to the trees distributed in down-slopes with the reason of higher fire severity. The larger deocambium area in the tree bark is, the earlier tree growth after fire is. During the early growth stage, the damaged tree bark will Spill over much resin. The height of running resin is higher than that of dead cambium. Damaged trees sprout and grow more slowly and the length of leaves are shorter than these normal trees. The chiorophyll content of serious damaged trees is much higher than that of normal trees. The chiorophyll content of dying trees is 64. 29% higher than that of the contrast ones. Cell membrance penetrability of damaged trees is also higher than that of normal trees.
