The Relationship between the Stand Growth and Root Biomass of Cunninghamia lanceolate Plantations

doi:10.16258/j.cnki.1674-5906.2021.06.002

Ecology and Environment ›› 2021, Vol. 30 ›› Issue (6): 1121-1128.DOI: 10.16258/j.cnki.1674-5906.2021.06.002

• Research Articles • Previous Articles Next Articles

The Relationship between the Stand Growth and Root Biomass of Cunninghamia lanceolate Plantations

LIAO Yingchun¹^,²(), DUAN Honglang¹^,², SHI Xingxing¹, MENG Qingyin³, LIU Wenfei¹^,², SHEN Fangfang¹^,², FAN Houbao¹^,²^,^*(), ZHU Tao¹

1. College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology, Nanchang 330099, China
2. Jiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems & Watershed Ecohydrology/Nanchang Institute of Technology, Nanchang 330099, China
3. Guanzhuang National Forestry Farm, Shaxian 365050, China

Received:2021-02-27 Online:2021-06-18 Published:2021-09-10
Contact: FAN Houbao

杉木（Cunninghamia lanceolate）人工林生长状况与根系生物量相关性研究

廖迎春¹^,²(), 段洪浪¹^,², 施星星¹, 孟庆银³, 刘文飞¹^,², 沈芳芳¹^,², 樊后保¹^,²^,^*(), 朱涛¹

1.南昌工程学院水利与生态工程学院,江西南昌 330099
2.江西省退化生态系统修复与流域生态水文重点实验室,江西南昌 330099
3.福建沙县官庄国有林场,福建沙县 365050

通讯作者: 樊后保
作者简介:廖迎春（1977年生）,女,副教授,博士,主要从事森林生态研究。E-mail: liaoyingc@163.com
基金资助:
国家自然科学基金项目(31960308);江西省教育厅科技项目(GJJ201906)

Abstract

Abstract:

To clarify the relationship between the growth of Cunninghamia lanceolata plantations and root biomass for further understanding the adaptation mechanism of plants to the environment, providing a scientific basis for plantation management, three 12-14-year-old Cunninghamia lanceolata plantations with significantly different stand biomass [high stand biomass (C_H), medium stand biomass (C_M), low stand biomass (C_L)] in Shaxian, Fujian Province were selected as the research objects. The roots and soil samples were collected by the root drilling method in each plot. Soil C, soil N, soil C?N and the root biomass of different groups (absorbing roots (1^st-2^nd order), transporting fine roots (3^rd-5^th), coarse roots (>5^th order) and herb roots) in 0-10 cm, 10-20 cm and 20-40 cm soil layers were determined. The relationships between root biomass of different groups and stand biomass were also analyzed. The results showed that, (1) the contents of soil C and soil N in each soil layer were C_H>C_L (P<0.05). However, there was no significant difference in soil C?N in 0-10 cm and 10-20 cm soil layers, but there was a significant difference in 20-40 cm soil layer of different plantations, which showed C_L>C_M>C_H(P<0.05). (2) Absorbing roots, transporting fine roots and coarse roots were mainly distributed in 0-20 cm soil layer, accounting for 84.2-85.9%, 84.6-85.2% and 78.6%-80.0% of each root group in 0-40 cm soil layer, respectively. Though the proportion of absorbing root density only accounted for 5.0%-8.7% of the total root biomass density, there were significant differences between plantations (P<0.05). In 0-10 cm and 10-20 cm soil layers, the absorbing root biomass densities were C_H>C_L (P<0.05). However, the root biomass density of herb was low, and there was no significant difference between plantations and soil layers. (3) The biomass of absorbing roots in 0-40 cm soil layer showed differences between plantations and were significantly correlated with stand biomass. That is to say, the higher stand biomass, the higher absorbing root biomass. These results indicate that Cunninghamia lanceolata plantations have higher root biomass densities in soils with higher soil C and soil N. Soil C and soil N may be the main reason for determining the root biomass and growth of Cunninghamia lanceolata in the same area. Of the root groups, absorbing roots are more sensitive to environmental variations than other root groups. Usually, fertile soil can result in higher absorbing root biomass and higher stand biomass.

Key words: Cunninghamia lanceolata, stand growth, fine roots, biomass, root distribution, absorbing roots, soil nutrients

摘要：

为明确杉木（Cunninghamia lanceolata）人工林生长状况与根系生物量的关系,进一步认知植物对环境的适应,为人工林管理提供科学依据,以福建沙县12—14年生杉木人工林为对象,选择林分生物量差异显著的3种林分（分别为高生物量C_H、中生物量C_M和低生物量C_L）,采用根钻法对根系和土壤进行取样,测定0—10、10—20、20—40 cm土层土壤C含量、土壤N含量、土壤C?N,杉木不同组分根系[吸收根（1—2级）、运输细根（3—5级）、粗根（5级以上）以及灌草根]生物量密度,并分析了不同组分根系生物量与杉木人工林林分生物量的关系。结果表明,（1）土壤C、N含量在各土层均表现为C_H>C_L（P<0.05）。土壤C?N在0—10 cm和10—20 cm土层无显著差异,但在20—40 cm土层表现为C_L>C_M>C_H（P<0.05）;（2）杉木根系主要分布在浅层土壤,各林分0—20 cm土层杉木吸收根,运输细根和粗根分别占0—40 cm土层的84.2%—85.9%、84.6%—85.2%和78.6%—80.0%。尽管吸收根生物量密度仅占总根生物量密度的5.0%—8.7%,但在不同林分间差异显著,在0—10 cm和10—20 cm土层表现为C_H>C_L（P<0.05）。灌草根生物量密度较低,各林分和土层间均无显著差异;（3）不同林分0—40 cm土层吸收根生物量差异显著,且与林分生物量呈正相关关系（P<0.05）。该研究结果表明土壤C、N含量的差异可能是造成根系生物量和林分生物量存在差异的主要原因,土壤C、N含量高的林分,杉木吸收根生物量和林分生物量均较高。在不同组分的根系中,杉木吸收根对外界环境变化最为敏感,养分条件好的林分和土层,吸收根的生物量也更高。

关键词: 杉木, 林分生长, 细根, 生物量, 根系分配, 吸收根, 土壤养分

CLC Number:

S718.5
X173

LIAO Yingchun, DUAN Honglang, SHI Xingxing, MENG Qingyin, LIU Wenfei, SHEN Fangfang, FAN Houbao, ZHU Tao. The Relationship between the Stand Growth and Root Biomass of Cunninghamia lanceolate Plantations[J]. Ecology and Environment, 2021, 30(6): 1121-1128.

廖迎春, 段洪浪, 施星星, 孟庆银, 刘文飞, 沈芳芳, 樊后保, 朱涛. 杉木（Cunninghamia lanceolate）人工林生长状况与根系生物量相关性研究[J]. 生态环境学报, 2021, 30(6): 1121-1128.

Figures/Tables 6

References 54

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造林时间 Planting time	造林密度 D/(trees∙hm^-2)	平均胸径 D_BH/cm	林分生物量 B/(t∙hm^-2)	林分 Plantation
2008	3086	15.8±3.0a	192.4±21.8a	C_H
2007	3086	14.5±2.7b	151.4±12.1b	C_M
2006	3086	12.1±2.3c	94.5±21.9c	C_L

造林时间 Planting time	造林密度 D/(trees∙hm^-2)	平均胸径 D_BH/cm	林分生物量 B/(t∙hm^-2)	林分 Plantation
2008	3086	15.8±3.0a	192.4±21.8a	C_H
2007	3086	14.5±2.7b	151.4±12.1b	C_M
2006	3086	12.1±2.3c	94.5±21.9c	C_L

根系类别 Root group	林分 Plantation	土层 Soil layer
根系类别 Root group	林分 Plantation	0-10 cm	10-20 cm	20-40 cm
吸收根 Absorbing roots	C_H	0.32±0.04Aa	0.29±0.03Aa	0.10±0.04Ba
	C_M	0.27±0.04Aab	0.28±0.03Aab	0.09±0.03Ba
	C_L	0.25±0.02Ab	0.23±0.02Ab	0.09±0.01Ba
运输细根 Transporting fine roots	C_H	0.79±0.04Aa	0.88±0.26Aa	0.29±0.03Ba
	C_M	0.74±0.03Aab	0.87±0.08Aa	0.29±0.07Ba
	C_L	0.71±0.04Ab	0.83±0.05Aa	0.28±0.09Ba
粗根 Coarse roots	C_H	2.54±0.23Aa	2.58±0.22Aa	1.39±0.15Ba
	C_M	2.61±0.09Aa	2.52±0.04Aa	1.33±0.14Ba
	C_L	2.58±0.35Aa	2.49±0.26Aa	1.27±0.35Ba
灌草根 Herb roots	C_H	0.05±0.01Aa	0.06±0.01Aa	0.06±0.04Aa
	C_M	0.06±0.03Aa	0.07±0.02Aa	0.06±0.02Aa
	C_L	0.04±0.01Aa	0.06±0.02Aa	0.07±0.05Aa

根系类别 Root group	林分 Plantation	土层 Soil layer
根系类别 Root group	林分 Plantation	0-10 cm	10-20 cm	20-40 cm
吸收根 Absorbing roots	C_H	0.32±0.04Aa	0.29±0.03Aa	0.10±0.04Ba
	C_M	0.27±0.04Aab	0.28±0.03Aab	0.09±0.03Ba
	C_L	0.25±0.02Ab	0.23±0.02Ab	0.09±0.01Ba
运输细根 Transporting fine roots	C_H	0.79±0.04Aa	0.88±0.26Aa	0.29±0.03Ba
	C_M	0.74±0.03Aab	0.87±0.08Aa	0.29±0.07Ba
	C_L	0.71±0.04Ab	0.83±0.05Aa	0.28±0.09Ba
粗根 Coarse roots	C_H	2.54±0.23Aa	2.58±0.22Aa	1.39±0.15Ba
	C_M	2.61±0.09Aa	2.52±0.04Aa	1.33±0.14Ba
	C_L	2.58±0.35Aa	2.49±0.26Aa	1.27±0.35Ba
灌草根 Herb roots	C_H	0.05±0.01Aa	0.06±0.01Aa	0.06±0.04Aa
	C_M	0.06±0.03Aa	0.07±0.02Aa	0.06±0.02Aa
	C_L	0.04±0.01Aa	0.06±0.02Aa	0.07±0.05Aa

The Relationship between the Stand Growth and Root Biomass of Cunninghamia lanceolate Plantations

杉木（Cunninghamia lanceolate）人工林生长状况与根系生物量相关性研究

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