抚育间伐对辽东山区3种林型林分总断面积和总收获量的影响

Effects of thinning on the total basal area and total yield of stand in three forest types in eastern mountainous region of Liaoning Province

利用几十年的定位观测数据,分析了抚育间伐对辽东山区红松人工林、天然次生蒙古栎林和人工诱导的阔叶红松林3种林型林分总断面积和总收获量的影响。结果表明:与对照区相比,抚育间伐没有提高红松人工林的林分断面积和蓄积总生长量,但极强度和强度间伐能提高红松人工林的林分断面积生长率。林分总断面积随着间伐强度的增加先升高后降低,各间伐强度均能提高林分总断面积,极强度间伐除外。抚育间伐能提高红松人工林林分蓄积生长率,弱度区除外;红松人工林林分总收获量随着间伐强度的增加先升高后降低,各间伐强度均能提高林分总收获量,中度间伐效果最好。抚育间伐能提高蒙古栎林林分断面积和蓄积总生长量、生长率以及林分总断面积和总收获量,各指标随着间伐强度的增加先升高后降低,中度间伐效果最好。抚育间伐能提高人工诱导的阔叶红松林林分断面积和蓄积总生长量、生长率以及林分总断面积和总收获量,林分断面积和蓄积总生长量、林分总断面积和林分总收获量随着间伐强度的增加而升高,林分断面积和蓄积生长率随着间伐强度的增加先升高后略有降低,强度间伐效果最好。可见,合理的间伐强度能够提高3种林型的林分总断面积和总收获量。

Experimental plots were established for thinning effects on the total basal area and total yield of stand in three forest types, Piruts koraiensis plantation, natural secondary Quercus mongolica forest and artificially inducing broad-leaved Pinus koraiensis forest in eastern mountainous region of Liaoning province by using several decades＂ observation data. The results showed that thinning could not improve the total increment of stand basal area and stand volume in Pinus koraiennsis plantation, but over-high intensity and high intensity thinning could improve the growth rate of stand basal area. With the increase of thinning intensity, the total stand basal area in Pinus koraiensis plantation first increased, and then decreased. All thinning intensity could improve the total stand basal area in P/ruts korahens/s plantation, except over-high intensity. All thinning intensity could improve the growth rates of stand volttrne in Pinus koraien- s/s plantation, except low intensity. With the increase of thinning intensity, the total yield of Pinus koraiensis plantation first increased, and then decreased. All thinning could improve the total yield of Pinus koraiensis plantation, medium intensity is the best. Thinning could improve the total increment and the growth rote of stand basal area and stand volume in natural secondary Quercus mongolica forest. Thinning could improve the total stand basal area and the total yield of natural secondary Quercus mongolica forest. With the in- crease of thinning intensity, all indexes of secondary Quercus mortgolica forest first increased, and then decreased, medium intensity is the best. Thinning could improve the total increment and the growth rate of stand basal area and stand volume in artificially inducing broad-leaved Pinus koraiensis forest. Thinning could improve the total stand basal area and the total yield of artificially inducing broad-leaved Pinus koraiemis forest. With the increase of thinning intensity, the total increment of stand basal area and stand volume, the total stand basal area and the total yield increased. With the increase of thinning intensity, the growth rate of stand basal area and stand volume first increased, and then decreased, high intensity is the best. Therefore reasonable thinning intensity could improve the total stand basal area and the total yield of forest.