高寒地区不同土壤改良方式对青杨生长的影响

Effects of Different Soil Amelioration on Growth of Populus cathayana

为了促进青杨在天峻县的生长,通过改良天峻县高原冻土层土壤(添加不同比例森林土、羊粪、珍珠岩、泥炭、细砂等改良材料),改善其理化性质,根据不同土壤改良方式对青杨胸径、株高、新生枝条数生长参数的影响,筛选高寒高海拔冻土层地区最适合青杨生长的土壤改良方式。结果表明:不同改良配方对土壤状况和青杨生长均有不同程度的改善和促进作用,其中S4(60%森林土+10%腐熟羊粪+10%河沙+5%珍珠岩+15%本土)的改良方式与S8(60%泥炭+10%腐熟羊粪+10%河沙+10%本土)的改良方式均较优,其株高增长率分别为14.5%和13.9%,新生枝条增长率分别为53.3%和73.3%,胸径的增长率分别达到55%和43.3%,均有10%以上的增长量。S4和S8最适合高寒高海拔冻土层地区青杨生长发育的土壤改良方式。

In order to improve the growth of Populus cathayanain Tianjun County,through improving plateau permafrost soil（adding different proportions of forest soil,sheep manure,perlite and peat and sand modified material）to improve its physicochemical properties,soil amelioration modes which are adapted to growth of Populus cathayanain frozen soil zone with alpine and high-altitude were screened according to the effects of different methods of soil improvement on DBH,tree height and growth parameters of new branches.Result shows that the improved formula have varying degrees of improvement and promotion on different soil conditions and growth of Populus cathayana.The amelioration mode of S4（60%forest soil＋10% sheep manure＋10%river sand＋ 5% perlite＋15% original soil）and the amelioration mode of S8（60% peat＋10% sheep manure＋10% river sand 10% original soil）are all excellent;height growth rate of increase of S4 S8 is 14.5% and 13.9%,respectively;their new shoots of growth rate is 53.3% and 73.3%,respectively,DBH growth rate reach 55% and 43.3%,respectively,which have more than 10% increase in volume.S4 and S8are soil amelioration modes which are most suitable for growth of Populus cathayanain permafrost area with alpine high-altitude.