Comparative analysis on the fine root traits of the four native broad-leaved trees in the hilly region of central Sichuan Province

doi:10.3969/j.issn.1000-2006.201811008

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (1): 31-38.doi: 10.3969/j.issn.1000-2006.201811008

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Comparative analysis on the fine root traits of the four native broad-leaved trees in the hilly region of central Sichuan Province

CHEN Junhua¹^,²(), ZHOU Dasong¹^,², NIU Mu³, BIE Pengfei⁴, XIE Tianzi¹^,², ZHAO Run⁴, MU Changlong¹^,²^,^*()

1. Sichuan Academy of Forestry,Sichuan Key Laboratory of Ecological Restoration and Conservation for Forest and Wetland, Chengdu 610081, China
2. Sichuan Longmenshan National Positioning Observation and Research Station for Forest Ecosystem, Pingwu 622550, China
3. College of Forestry, Beijing Forestry University, Beijing 100083, China
4. Life Science and Technology College, Mianyang Teachers’ College, Mianyang 621000, China

Received:2018-11-05 Revised:2019-09-06 Online:2020-02-08 Published:2020-02-02
Contact: MU Changlong E-mail:295454166@qq.com;mucl2006@aliyun.com

Abstract

Abstract:

【Objective】 Although cypress (Cupressus funebris) plantations are the predominant type of protected forests in the central Sichuan hilly region of China, their comprehensive benefits have not yet to be realized, owing to the high-density nature of stands and single-species composition. Moreover, only a few tree species can adapt to the central Sichuan hilly region, which is characterized by shallow infertile purple soils. In order to gain scientific evidence on which to base the selection and management of protected forest species in the central Sichuan hilly region, we examined the fine root traits of four native broad-leaved tree species (Alnus cremastogyne, Camptotheca acuminata, Cinnamomum camphora and Toona sinensis), which were planted in strips cut in cypress stands to determine differences in the utilization of below-ground resources among these four species. 【Method】 In order to enhance Cupressus funebris monoculture, we examined the effects Cupressus funebris stand modification by cutting strips among the Cupressus funebris trees and replanting these with four native broad-leaved tree species ( A. cremastogyne, Camptotheca acuminata, Cinnamomum camphora and T. sinensis) 7 years age. Five typical healthy individuals of each tree species were selected and we extracted whole root systems in order to analyze features such as fine root (diameter < 2 mm) biomass traits, morphological characteristics, and branching structure. 【Result】 ① We observed that the root biomass density of fine roots was highest in A. cremastogyne [(0.156 ± 0.030) kg/m ³], which was 15.67, 11.72 and 4.61 times higher than that ofCamptotheca acuminata, Cinnamomum camphora and T. sinensis, respectively. The root surface area density of A. cremastogyne, Camptotheca acuminata, Cinnamomum camphora and T. sinensis was 0.99, 0.45, 0.68 and 1.13 m²/m³, respectively, and the root length density was 110.33, 10.58, 26.64 and 97.56 m/m³, respectively. ② The average root diameter of the four species was ranked as Camptotheca acuminata (1.67 mm) > Cinnamomum camphora (1.06 mm) > T. sinensis (0.77 mm) > A. cremastogyne (0.73 mm). The specific root lengths for A. cremastogyne, Camptotheca acuminata, Cinnamomum camphora and T. sinensis were 62.54, 49.31, 81.53, 287.50 cm/g, whereas their specific root surface areas were 13.58, 25.61, 27.35 and 83.15 cm²/g, respectively. The root tissue density of A. cremastogyne was found to be significantly higher than that of the other three species (df = 3, F = 360.726, P < 0.05). ③ The specific root tip number (df = 3, F = 391.659, P < 0.01), root tip density (df = 3, F = 103.857, P < 0.05), and root fork density (df = 3, F = 104.617, P < 0.05) of A. cremastogyne were 1 056 tips/g, 2.37 tips/cm and 2.65 tips/cm respectively, which were also significantly higher than those of the other three species. ④ Although the total N content in the fine roots of A. cremastogyne was 33.27%, 88.65% and 21.93% higher than that of Camptotheca acuminata, Cinnamomum camphora and T. sinensis, the reserves of total C, total P and total K content were found to be highest in T. sinensis. 【Conclusion】 In the early stages of stand transformation, A. cremastogyne and T. sinensis (which are the light demanding tree species) have higher root biomass density and stronger competitiveness due to the abundance of sunlight in the cut strips. Furthermore, during the early stage of this study, the experimental stand was characterized by poor soil quality and low soil moisture content, conditions under which these two shallow-rooted tree species can gain access to larger amounts soil space and nutrients by increasing the branching of horizontal roots. In contrast,Camptotheca camphora and Cinnamomum acuminate acquire soil space and nutrients by increasing fine-root diameter and vertical depth. Collectively, the results of this study indicate that there are significant differences in the fine-root traits of four examined broad-leaved trees species growing in the central Sichuan hilly region of China, and that these difference reflect differences in the strategies used for resource acquisition.

Key words: native broad-leaved tree, fine root trait, fine root morphological characteristic, fine root branching structure, nutrient content, hilly region of central Sichuan Province

CLC Number:

S718

CHEN Junhua, ZHOU Dasong, NIU Mu, BIE Pengfei, XIE Tianzi, ZHAO Run, MU Changlong. Comparative analysis on the fine root traits of the four native broad-leaved trees in the hilly region of central Sichuan Province[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(1): 31-38.

Figures/Tables 5

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林分类型 stand type	海拔/m altitude	坡度/ (°) slope	林分密度/ (株·hm^-2) stand density	平均树高/ m mean tree height	平均胸径/ cm mean DBH	土壤容重/ (g·cm^-3) bulk density	pH	有机质含量/ (g·kg^-1) organic matter content	全氮含量/ (g·kg^-1) TN content	全磷含量/ (g·kg^-1) TP content
桤木A. cremastogyne	469	12	2 578	9.30	7.64	1.35	8.58	9.37	1.73	0.52
喜树C. acuminata	475	10	2 597	8.11	5.30	1.52	8.13	8.16	1.14	0.39
香樟C. camphora	458	13	2 592	8.91	6.22	1.48	8.62	10.26	1.28	0.67
香椿T. sinensis	482	16	2 601	8.13	5.63	1.35	8.31	7.79	0.94	0.62

树种 tree species	根生物量密度/ (kg·m^-3) root biomass density	根表面积密度/ (m²·m^-3) root surface area density	根长密度/ (m·m^-3) root length density
桤木A. cremastogyne	0.156±0.030 a	0.99±0.20 a	110.33±14.07 a
喜树C. acuminata	0.010±0.002 c	0.45±0.06 c	10.58±0.68 d
香樟C. camphora	0.013±0.002 c	0.68±0.06 b	26.64±2.47 c
香椿T. sinensis	0.034±0.004 b	1.13±0.12 a	97.56±7.13 b

树种 tree species	全氮含量 TN content	全碳含量 TC content	全磷含量 TP content	全钾含量 TK content
桤木A. cremastogyne	10.385±1.737 a	437.379±18.501 c	0.566±0.069 b	3.282±0.565 d
喜树C. acuminata	7.793±0.824 c	433.130±8.888 c	0.411±0.082 c	13.921±1.116 b
香樟C. camphora	5.505±0.587 d	468.383±16.238 b	0.327±0.070 c	7.047±0.556 c
香椿T. sinensis	8.517±1.128 b	545.497±26.243 a	0.624±0.086 a	15.233±1.625 a

Comparative analysis on the fine root traits of the four native broad-leaved trees in the hilly region of central Sichuan Province

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