Chin J Plan Ecolo ›› 2017, Vol. 41 ›› Issue (10): 1041-1050.doi: 10.17521/cjpe.2016.0317

• Research Articles • Previous Articles     Next Articles

Effects of short-term nitrogen addition on fine root biomass, lifespan and morphology of Castanopsis platyacantha in a subtropical secondary evergreen broad-leaved forest

Guan-Tao CHEN1, Yong PENG1, Jun ZHENG2, Shun LI1, Tian-Chi PENG1, Xi-Rong QIU1, Li-Hua TU1,*()   

  1. 1College of Forest, Sichuan Agricultural University, Chengdu 611130, China

    2Suining Forestry Bureau, Suining, Sichuan 629000, China
  • Online:2017-12-24 Published:2017-10-10
  • Contact: Li-Hua TU E-mail:tulhsicau@163.ccom

Abstract:

Aims Fine roots are the principal parts for plant nutrients acquisition and play an important role in the underground ecosystem. Increased nitrogen (N) deposition has changed the soil environment and thus has a potential influence on fine roots. The purpose of this study is to reveal the effect of N deposition on biomass, lifespan and morphology of fine root.Methods A field N addition experiment was conducted in a secondary broad-leaved forest in subtropical China from May 2013 to September 2015. Three levels of N treatments: CK (no N added), LN (5 g·m-2·a-1), and HN (15 g·m-2·a-1) were applied monthly. Responses of fine root biomass, lifespan, and morphology of Castanopsis platyacantha to N addition were analyzed by using a minirhizotron image system from April 2014 to September 2015. Surface soil sample (0-10 cm) was collected in November 2014 and soil pH value, and concentrations of NH4+-N and NO3--N were measured.Important findings The biomass and average lifespan of the fine roots of C. platyacantha were 128.30 g·m-3 and 113-186 days, respectively, in 0-45 cm soil layer. Nitrogen addition had no significant effect on either fine root biomass or lifespan in 0-45 cm soil layer. However, LN treatment significantly decreased C. platyacantha root superficial area in 0-15 cm soil layer. HN treatment significantly decreased soil pH value. Our study indicated that short-term N addition influences soil inorganic N concentration and thus decreased pH value in surface soil, and thereafter affect fine root morphology. Short-term N addition, however, did not affect the fine root biomass, lifespan and morphology in subsoil.

Key words: nitrogen deposition, fine root biomass, fine root lifespan, fine root morphology, minirhizotron

Table 1

Soil physicochemical properties in a secondary evergreen broad-leaved forest, Wawu Mountain (mean ± SE)"

土层深度
Soil depth (cm)
pH 土壤容重
Soil bulk density (g·cm-3)
有机碳含量
Organic carbon content (g·kg-1)
全氮含量
Total nitrogen content (g·kg-1)
全磷含量
Total phosphorus
content (g·kg-1)
全钾含量
Total potassium content (g·kg-1)
0-10 3.19 ± 0.03 0.41 ± 0.03 121.9 ± 11.7 5.80 ± 0.30 0.50 ± 0.01 13.89 ± 0.92
10-40 3.76 ± 0.03 0.66 ± 0.02 26.6 ± 2.5 1.51 ± 0.08 0.26 ± 0.03 17.07 ± 0.82
40-70 3.97 ± 0.02 0.89 ± 0.03 12.6 ± 1.2 0.82 ± 0.05 0.18 ± 0.01 19.02 ± 1.17
70-100 4.03 ± 0.02 0.99 ± 0.03 7.8 ± 0.8 0.57 ± 0.04 0.21 ± 0.01 19.31 ± 1.26

Table 2

The effect of N addition on surface soil (0-10 cm) chemical element and pH value (mean ± SE)"

pH TN (g·kg-1) NH4+-N (mg·kg-1) NO3--N (mg·kg-1)
CK 3.99 ± 0.05a 6.62 ± 0.50 25.62 ± 5.79 25.47 ± 3.90
LN 3.82 ± 0.02ab 7.19 ± 0.57 21.63 ± 6.02 26.27 ± 4.65
HN 3.78 ± 0.08b 7.23 ± 0.35 40.15 ± 12.39 36.69 ± 4.61
单因素方差分析
One-way ANOVA analysis
p = 0.04 p = 0.62 p = 0.33 p = 0.21

Table 3

Layer I (0-15 cm) correlation analysis results of Castanopsis platyacantha fine root morphology index, median lifespan, and soil physicochemical property (0-10 cm)"

中值寿命
Median lifespan
pH 总氮
Total nitrogen
NH4+-N NO3--N 根段长
Root segment length
根段表面积
Root segment surface-area
pH 0.84**
总氮 Total nitrogen -0.54 -0.57
NH4+-N -0.34 -0.75* 0.45
NO3--N -0.41 -0.67* 0.54 0.72*
根段长 Root segment length 0.37 0.35 -0.15 0.01 -0.18
根段表面积 Root segment surface-area 0.73* 0.74* -0.50 -0.24 -0.50 0.76*
根直径 Root diameter 0.48 0.47 -0.32 -0.27 -0.14 -0.48 0.15

Fig. 1

Fine root biomass in different soil layer (mean ± SE). CK, control (0 g·m-2·a-1); LN, low nitrogen addition (5 g·m-2·a-1); HN, high nitrogen addition (15 g·m-2·a-1). p value is the results of one-way ANOVA analysis in different soil layer."

Fig. 2

Effects of nitrogen additions on fine root survival curve. p values are the survival curves significance test result of N addition in the same soil layers. CK, control; LN, low nitrogen; HN, high nitrogen."

Fig. 3

Effects of nitrogen additions on fine root diameter, length and superficial area at different soil layers (mean ± SE). CK, control; LN, low nitrogen; HN, high nitrogen. Text and letters in figure are the result of one-way ANOVA analysis on same morphology indexes in the same soil layers."

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