Effects of Artificially Acidified Soils on the Growth and Nutrient Status of Pinus koraiensis Seedlings

摘要

Three-years-old Pinus koraiensis seedlings transplanted in the artificially acidified forest soils during growing period for 182 days from April 11 to October 9, 2002. That soil was mixed with artificial acid solution at 0, 10, 30, 60 and 90meq H~+ per 1L of soil. The result was as following. Some seedlings withered up at 60 and 90meqH~+ treatment after 8 weeks. Seedling growth at control after 182 days was greater than 10, 30, 60, 90meqH~+ treatment. Also, Relative Growth Rate(RGR) and Net Assimilation Rate(NAR) increased at 10 and 30meqH~+ treatments comparing to control, hut those decreased at 60 and 90meqH~+ treatments. Leaf Weight Ratio(LWR) did not change by each treatment. There was a significantly positive correlation(r=0.99, p<0.001) between relative total dry weighl(TDW) of seedlings and (Ca+Mg+K)/A1 molar ratio in soil. When the (Ca + Mg+K)/Al molar ratio was 1.0, the TDW decreased about 40%.