岷江上游干旱河谷地区油松和岷江柏细根生物量和根长密度

doi:10.7525/j.issn.1673-5102.2024.02.011

摘要/Abstract

摘要：

了解岷江上游干旱河谷地区12年生油松（Pinus tabulaeformis）和岷江柏（Cupressus chengiana）人工林细根（直径≤2 mm）生物量和根长密度在土层中的垂直分布状况，分析不同土层中细根系统的碳分配策略，为岷江上游干旱河谷地区植被恢复提供理论依据。以岷江上游干旱河谷地区的油松和岷江柏人工林为研究对象，采用土钻法进行取样，测定2种林分不同土层深度（h）（0 cm<h≤15 cm和15 cm<h≤30 cm）中吸收根（1~3级）和运输根（≥4级的细根）生物量和根长密度，以及吸收根占总细根生物量和根长密度比例。结果显示：油松和岷江柏吸收根生物量和根长密度在0 cm<h≤15 cm土层均显著高于15 cm<h≤30 cm土层，而运输根生物量和根长密度在土层间差异均不显著；油松和岷江柏吸收根占总细根生物量和根长密度比例在0 cm<h≤15 cm土层均显著高于15 cm<h≤30 cm土层（P<0.05）；岷江柏吸收根占总细根生物量和根长密度比例在2个土层中均显著高于油松（P<0.05）。研究结果表明，在养分有效性最高的土壤表层，油松和岷江柏细根系统内将更多的碳分配到吸收根。

关键词: 吸收根, 运输根, 根生物量, 根长密度, 干旱河谷

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

中图分类号:

S728.2

夏娟, 孙旭东, 王娜, 李锐, 陈娟, 高国强. 岷江上游干旱河谷地区油松和岷江柏细根生物量和根长密度[J]. 植物研究, 2024, 44(2): 259-266.

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.

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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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