Root biomass of different stand-age Pinus yunnanensis forests and its distribution pattern in different soil depths

Abstract

Abstract: With average-tree-specific sampling method,the authors measured the root biomass of Pinus yunnanensis forests with different stand ages in Yongren County,Yunnan Province.The results indicated that total root biomass increased from 8.50 t·hm^-2 in young stand (15～17 yr) to 11.70 t·hm^-2 in middle-aged stand (30～32 yr),and to 18.91 t·hm^-2 in mature stand (60～130 yr).Among different stand age classes,the biomass of coarse roots (>10 mm) varied greatly (1.5～12.3 t·hm^-2),whereas those of medium (5～10 mm) and fine(<5 mm)roots showed less variation (medium roots 1.4～1.6 t·hm^-2,fine roots 5.3～6.2 t·hm^-2).The root biomass of mature stand decreased with soil depth,approximately 93% of total underground biomass being distributed in surface layer (0～30 cm),and only 7% in deeper layer (30～115 cm).

Key words: Root biomass, Pinus yunnanensis forest, Stand age, Soil depth

CLC Number:

S718

DENG Kunmei, LUO Tianxiang, ZHANG Lin, WANG Xueyun, LI Changhui . Root biomass of different stand-age Pinus yunnanensis forests and its distribution pattern in different soil depths [J]. Chinese Journal of Applied Ecology, 2005, 16(1): 21-24.

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