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作 者 ：潘 伟,王彦辉,于澎涛,李志勇,莫 菲,史东梅,杜士才,何 萍,段 健

期 刊 ：林业科学研究 2009年 22卷 6期 页码：840-845

关键词：马尾松；细根；酸雨区；石灰石粉；土壤改良；

Keywords:Pinus massoniana, fine root, acid rain area, limestone powder, soil amelioration,

摘 要 ：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。

Abstract:The dose-effect of limestone powder on fine roots of Masson pine(Pinus massoniana) forest growing on acidified soil was studied at Tieshanping, Chongqing in Southwest China. Ten dominant trees of P. massoniana were selected in a 28-years-old stand for this study, and five treatments or application doses (134,261,388,515 and 642 g·m^-3) of limestone powder were designed to be mixed in soil columns around the sampled trees. The invertigations were conducted before and 2 years after treatment. The results showed that the fine root characters of P.msaaoniana were significantly different after applying different doses of limestone power. With the increase of does, all the five character values showed a trend of decrease after increase. The character value after applying 388 g·m^-3 of limestone powder was the maximum,indicating its best effect to promote the growth of root system,i.e. the length,surface area, root tip amount,volume and dry mass of fine roots were 600 m·m^-3,130 dm²·m^-3,150 000 tips. m^-3,220 cm³·m^-3, and 39 g·m^-3,respectively.

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