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Response of Fine Root Characteristics of Pinus massoniana to the Doses of\n Limestone Powder Mixed in Soil in the Acid Rain Area of Chongqing, China

  • 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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Response of Fine Root Characteristics of Pinus massoniana to the Doses of\n Limestone Powder Mixed in Soil in the Acid Rain Area of Chongqing, China

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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