Chin J Plan Ecolo ›› 2016, Vol. 40 ›› Issue (2): 177-.doi: 10.17521/cjpe.2015.0182

• Research Articles • Previous Articles    

Effect of neighboring competition on photosynthetic characteristics and biomass allocation of Chinese fir seedlings under low phosphorus stress

Zhi-Yu CHEN1,2, Qi LI1,2,3, Xian-Hua ZOU1,2, Xiang-Qing MA1,2, Peng-Fei WU1,2,*()   

  1. 1College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China

    2The State Forestry Administration Fir Engineering Technology Research Center, Fuzhou 350002, China

    3Soil and Water Conservation Monitoring Centre of Zhumadian, Zhumadian, Henan 463000, China
  • Online:2016-03-08 Published:2016-02-10
  • Contact: Peng-Fei WU E-mail:fjwupengfei@126.com

Abstract: Aims

To explore the effects of neighbor competition on photosynthetic characteristics in needles and biomass accumulation and allocation of Chinese fir (Cunninghamia lanceolata) seedlings under low phosphorus (P) environment, and to investigate the complex adaptive responses of Chinese fir to available P limitation and intraspecific competition.

Methods

The experiment was performed in a greenhouse at Fujian Agriculture and Forestry University with a Chinese fir clone named 'YANG-020'. The specially designed glass pots of 30 cm length, 30 cm width and 40 cm height were made for the P stress and competition simulation. Two seedlings were planted in each pot, except the control with a single seedling in the center of pot. All the competition treatments were involved three P supply levels: no P supply (0 mg·kg-1 KH2PO4), low P supply (6 mg·kg-1 KH2PO4) and normal P supply (12 mg·kg-1 KH2PO4). The seedlings of each treatment were harvested to determine shoot biomass, root biomass and root: shoot ratio at the prime stage (9th September, 2013), interim stage (30th October, 2013) and last stage (19th December, 2013), separately, after determining the intercellular CO2 concentration, net photosynthetic rate, transpiration rate and stomatal conductance in needles over the the experimental period.Important findings There were significantly three-way interactive effects among competition treatment, P supply level and stress stage on the photosynthetic indexes of Chinese fir seedlings, including intercellular CO2 concentration, net photosynthetic rate, transpiration rate and stomatal conductance (p < 0.05), but no significantly interactive effect was exhibited among the three factors on the biomass allocation (p > 0.05). Compared to the normal P supply, all of the values (i.e., net photosynthetic rate, transpiration rate and stomatal conductance) decreased markedly in Chinese fir needles. The factors of low P supply and neighboring competition additively affected stomatal conductance of needles. Over the course of the stress experimental period, the value of transpiration rate in needles gradually decreased, but both root biomass and root:shoot ratio sharply increased. For the stomatal conductance and intercellular CO2 concentration, both of them gradually declined from the prime stress stage to the interim stage, while increased during the last stress stage.

Key words: assimilate transport, Cunninghamia lanceolata, competitive strategy, low phosphorus stress, root: shoot ratio

Fig. 1

The design pot used for neighboring competition experiment."

Table 1

Effects of competition treatment, phosphorus supply level and stress stage on the photosynthesis characteristics of Cunninghamia lanceolata seedlings"

自由度
Degrees of freedom
FF value
胞间CO2浓度
Intercellular CO2 concentration
净光合速率
Net photosynthetic rate
蒸腾速率
Transpiration rate
气孔导度
Stomatal conductance
竞争处理
Competition treatment (a)
1 53.9** 5.807* 11.181** 4.4*
供磷水平
Phosphorus supply level (b)
2 0.7ns 16.698** 15.740** 20.9**
胁迫时期
Stress stage (c)
2 10.4** 0.698ns 18.314** 3.3*
a和b组间交互作用
Effects between a and b
2 29.1** 6.984** 5.919** 0.9ns
a和c组间交互作用
Effects between a and c
2 6.6** 9.382** 3.494* 8.2**
b和c组间交互作用
Effects between b and c
4 8.7** 4.323** 9.111** 10.5**
a,b和c组间交互作用
Effects among a, b and c
4 3.9** 3.522* 8.247** 8.4**
误差
Error
90

Fig. 2

Photosynthetic characteristics of Cunninghamia lanceolata seedlings under neighboring competition treatment (mean ± SE). Different small letters indicate significant difference between two competition treatments (p < 0.05)."

Fig. 3

Photosynthetic characteristics of Cunninghamia lanceolata seedlings under different phosphorus supply levels (mean ± SE). Different small letters indicate significant difference among three phosphorus supply levels (p < 0.05)."

Fig. 4

Photosynthetic characteristics of Cunninghamia lanceolata seedlings at different stress stages (mean ± SE). Different small letters indicate significant difference among three stress stages (p < 0.05)."

Table 2

Effects of competition treatment, phosphorus supply level and stress stage on the biomass allocation of Cunninghamia lanceolata seedlings"

自由度
Degrees of freedom
FF value
地上部分
Shoot
根系
Root
根冠比
Root to shoot ratio
竞争处理 Competition treatment (a) 1 1.767ns 0.017ns 0.659ns
供磷水平 Phosphorus supply level (b) 2 0.240** 38.689** 38.096ns
胁迫时期 Stress stage (c) 2 1.624ns 0.710** 4.927**
a和b组间交互作用 Effects between a and b 2 1.225ns 1.411ns 0.007ns
a和c组间交互作用 Effects between a and c 2 2.539ns 0.438ns 1.343ns
b和c组间交互作用 Effects between b and c 4 0.412ns 0.908ns 1.075ns
a,b和c组间交互作用 Effects among a, b and c 4 0.813ns 1.571ns 0.861ns
误差 Error 90

Fig. 5

Biomass allocation of Cunninghamia lanceolata seedlings under neighboring competition treatment (mean ± SE). Different small letters indicate significant difference between two competition treatments (p < 0.05)."

Fig. 6

Biomass allocation of Cunninghamia lanceolata seedlings under different phosphorus supply levels (mean ± SE). Different small letters indicate significant difference among three phosphorus supply levels (p < 0.05)."

Fig. 7

Biomass allocation of Cunninghamia lanceolata seedlings at different stress stages (mean ± SE). Different small letters indicate significant difference among three stress stages (p < 0.05)."

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