Fine Root Biomass and Root Length Density of Pinus tabulaeformis and Cupressus chengiana Plantations in the Arid Valleys of the Upper Minjiang River

doi:10.7525/j.issn.1673-5102.2024.02.011

Abstract

Abstract:

To investigate the vertical distribution of root biomass（diameter≤2 mm） and root length density of Pinus tabulaeformis and Cupressus chengiana plantations in the arid valleys of the upper Minjiang River， and to analyze the carbon allocation strategy of fine root system in different soil layers， and to provide reference for vegetation restoration in the arid valleys of the upper Minjiang River. P. tabulaeformis and C. chengiana plantations were sampled by soil corer method， and the root biomass and root length density of absorptive roots（first to third order） and transport roots（≥fourth order） in different depth（h）（0 cm<h≤15 cm and 15 cm<h≤30 cm） were measured， as well as the proportions biomass and length density of absorptive roots to the total fine roots. The results showed that： the absorptive root biomass and root length density of P. tabulaeformis and C. chengiana were significantly higher in 0 cm<h≤15 cm than those in 15 cm<h≤30 cm， and the transport root biomass and root length density were not significantly different between soil layers； the proportions biomass and length density of absorptive roots to the total fine roots in 0 cm<h≤15 cm were significantly higher than that in 15 cm<h≤30 cm（P<0.05）； the proportions biomass and length density of absorptive roots to the total fine roots in 0 cm<h≤15 cm and 15 cm<h≤30 cm of C. chengiana were significantly higher than those of P. tabulaeformis（P<0.05）. These findings suggested that more carbon was allocated to the absorptive roots in the surface soil layers with the highest nutrient availability in P. tabulaeformis and C. chengiana root system.

Key words: absorptive roots, transport roots, root biomass, root length density, arid valleys

CLC Number:

S728.2

Juan XIA, Xudong SUN, Na WANG, Rui LI, Juan CHEN, Guoqiang GAO. Fine Root Biomass and Root Length Density of Pinus tabulaeformis and Cupressus chengiana Plantations in the Arid Valleys of the Upper Minjiang River[J]. Bulletin of Botanical Research, 2024, 44(2): 259-266.

Figures/Tables 7

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树种 Species	土层 Soil layer/ cm	全碳 Total carbon/ （g·kg^-1）	全氮 Total nitrogen/ （g·kg^-1）	全磷 Total phosphorus/ （g·kg^-1）	有效氮 Available nitrogen/ （mg·kg^-1）	有效磷 Available phosphorus/ （mg·kg^-1）
油松 Pinus tabulaeformis	0<h≤15	27.093±1.960aB	1.380±0.087aB	0.422±0.013aB	7.420±0.618aA	0.525±0.035aB
油松 Pinus tabulaeformis	15<h≤30	18.106±0.909bB	1.272±0.057aB	0.360±0.009bA	3.921±0.550bA	0.393±0.008bB
岷江柏 Cupressus chengiana	0<h≤15	42.561±1.837aA	1.841±0.006aA	0.506±0.023aA	3.937±0.554aB	0.704±0.038aA
岷江柏 Cupressus chengiana	15<h≤30	32.887±1.275bA	1.788±0.057aA	0.351±0.019bA	3.523±0.351aA	0.541±0.031bA

变异来源 Source of variation	自由度 d_f	吸收根生物量 Absorptive roots biomass		运输根生物量 Transport roots biomass		细根生物量 Fine roots biomass
变异来源 Source of variation	自由度 d_f	F	P	F	P	F	P
树种 Tree species	1	1.738	0.193	9.372	0.003	0.088	0.768
土层 Soil layer	1	12.193	0.001	1.211	0.276	8.932	0.004
树种×土层 Tree species×soil layer	1	2.032	0.160	0.005	0.941	1.137	0.291

变异来源 Source of variation	自由度 d_f	吸收根根长密度 Absorptive root length density		运输根根长密度 Transport root length density		细根根长密度 Fine root length density
变异来源 Source of variation	自由度 d_f	F	P	F	P	F	P
树种 tree species	1	0.755	0.388	2.247	0.139	0.439	0.511
土层 soil layer	1	18.100	<0.001	7.864	0.007	19.360	<0.001
树种×土层 tree species×soil layer	1	1.329	0.254	0.128	0.722	1.460	0.232

变异来源 Source of variation	自由度 d_f	吸收根占细根生物量比例 Proportion of absorptive to total fine root biomass		吸收根占细根根长密度比例 Proportion of absorptive to total fine root length density
变异来源 Source of variation	自由度 d_f	F	P	F	P
树种 Tree species	1	25.751	<0.001	7.715	0.007
土层 Soil layer	1	17.844	<0.001	11.080	0.002
树种×土层 Tree species×soil layer	1	0.020	0.254	0.647	0.425

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