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在重庆市铁山坪林场28年生马尾松纯林内选取10棵优势木,进行土柱内混施5个剂量(134、261、388、515、642 g.m-3)的石灰石粉试验,在混施前和混施2 a后分别进行了根系调查。结果表明:施不同剂量石灰石粉的马尾松的细根特征有明显差别。随着混施剂量的增加,细根的5个特征都表现为先增大后降低的趋势,施388 g.m-3石灰石粉的细根特征值最大,表明其促进根系生长的效应最好;细根长度、细根表面积、细根根尖数、细根体积、细根干质量分别为600 m.m-3、130 dm2.m-3、15万个.m-3、220 cm3.m-3、39 g.m-3。
Fifty dominant trees were selected from the 28-year-old Pinus massoniana pure forest in Tieshanping Forest Farm, Chongqing. Five limestone powder mixtures (134,261,388,515,642 gm-3) Before and after mixing a 2 a were conducted root investigation. The results showed that there were obvious differences in the fine root characteristics of Masson pine using different doses of limestone powder. With the increase of the amount of compounding, the five characteristics of fine roots showed the trend of first increasing and then decreasing. The fine root characteristic value of 388 gm-3 limestone powder was the highest, which showed that the effect of promoting root growth was the best. Root length, fine root surface area, fine root tip number, fine root volume, and fine root dry mass were 600 mm-3,130 dm2.m-3,150,000 m-3,220 cm3.m- 39 gm-3.