Chin J Plan Ecolo ›› 2015, Vol. 39 ›› Issue (9): 924-931.doi: 10.17521/cjpe.2015.0089

• Orginal Article • Previous Articles     Next Articles

A comparison of measured and calculated net community CO2 exchange: Scaling from leaves to communities

TANG Hai-Ping*(), XUE Hai-Li, FANG Fei   

  1. State Key Laboratory of Earth Surface Processes & Resource Ecology, Beijing Normal University, College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China
  • Received:2015-03-24 Accepted:2015-08-13 Online:2015-09-23 Published:2015-09-03
  • Contact: Hai-Ping TANG E-mail:tanghp@bnu.edu.cn
  • About author:

    # Co-first authors

Abstract:

Leaf net photosynthesis is crucial for detecting the mechanism of photosynthesis, whereas community net photosynthesis is useful for understanding the photosynthetic capacity of communities and its relationship with environmental factors. In particular, we need to scale up eco-physiological models from leaf scale to canopy level to study carbon cycling at regional or global scale. We hypothesized that accumulated leaf net photosynthetic rate (Pc) at community scale, i.e., calculated based on leaf net photosynthetic rate (Pn) and leaf area index (LAI), equals to measured net community CO2 exchange (NCE). The purpose of this study is to verify this hypothesis. Our field study was carried out in Duolun, Nei Mongol, China, where we constructed single-species communities by sowing Medicago sativa ‘Aohan’ seeds in three plots (3 m × 5 m) on May 30, 2012. On August 16, 2014, Pn of five healthy leaves of M. sativa ‘Aohan’ in each plot were measured with a LI-6400 portable photosynthesis system at 10:00, and net ecosystem CO2 exchange (NEE) in each plot was measured simultaneously with a LI-8100 system connected with a assimilation chamber (0.5 m × 0.5 m × 0.5 m). Pc was calculated based on Pn, number of leaves (n), LAI percentage of healthy leaves (r) and percentage of received effective light by leaves (m). NCE was derived from NEE and ecosystem respiration rate (Reco). Pc was 3.52 μmol CO2·m-2·s-1, and very close to NCE (3.56 μmol CO2·m-2·s-1), suggesting that leaf-scale photosynthesis may accurately predict community-scale photosynthesis. However, our method could not separate community respiration from soil respiration, and future studies, should be designed to counteract this effect. Scaling up from leaf photosynthesis to community photosynthesis should also consider vertical structure of communities and nonlinear responses of leaf photosynthesis to changes in light quantum.

Key words: net photosynthetic rate, canopy model, scaling up, Medicago sativa ‘Aohan’

Table 1

The comparison of leaf net photosynthetic rate (Pn) and accumulated leaf net photosynthetic rate (Pc) of Medicago sativa ‘Aohan’"

亚小区
Sub plot
Pn (μmol CO2·m-2·s-1) 叶片数
No. of leaves
平均叶面积
Average leaf area
(cm2)
健康叶片比例
Percentage of healthy leaves
叶片接受有效光照比例
Percentage of received effective light by leaf
Pc (μmol CO2·m-2·s-1) Pc / Pn
(%)
亚小区1 Sub plot 1 15.025b 650 3.113 0.4 0.7 3.41b 22.7
亚小区2 Sub plot 2 7.854a 580 2.477 0.5 0.7 1.58a 20.1
亚小区3 Sub plot 3 14.536b 740 3.081 0.6 0.7 5.57c 38.3
平均 Average 12.472 656 2.890 0.5 0.7 3.52 27.0

Table 2

The comparison of measured net community CO2 exchange (NCE) and accumulated leaf net photosynthetic rate (Pc) of Medicago sativa ‘Aohan’"

亚小区
Sub plot
Pc (μmol CO2·m-2·s-1) NCE (μmol CO2·m-2·s-1) 生态系统净气体交换速率
Net ecosystem CO2 exchange (NEE, μmol CO2·m-2·s-1)
生态系统呼吸速率 Ecosystem respiration rate (Reco, μmol CO2·m-2·s-1) 群落呼吸速率
Community respiration rate (Rc, μmol CO2·m-2·s-1)
NEE/Pn
(%)
Pc/NEE
亚小区1 Sub plot 1 3.41 3.38 1.07 3.74 1.40 7.1 3.2
亚小区2 Sub plot 2 1.58 1.48 0.98 0.81 0.21 12.5 1.6
亚小区3 Sub plot 3 5.57 5.82 2.38 5.56 2.37 16.4 2.3
平均 Average 3.52 3.56 1.48 3.37 1.33 12.0 2.4
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