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Citation:

Study on the Soil Respiration and Its Components of the Second Rotation Eucalyptus Plantations in Subtropical China

  • Received Date: 2013-06-28
  • In order to determine the seasonal pattern of respiration and elucidate the contribution of respiration components and their control factors in Eucalyptus plantations, comparative experiments and the trenching plot method with LI-8100 automated CO2 flux system were used to quantify the components of soil respiration in three-4-year-old second rotation pure plantations (PP2) of Eucalyptus and three 4-year-old second rotation mixed Eucalyptus urophylla and Dalbergia odorifera plantations (MP2) in Guangxi Zhuang Autonomous Region, southern China. The results showed that there were similar seasonal dynamics for the respiration and its compoments in both the plantations. The total respiration (RS), heterotrophic respiration (RH), and autotrophic respiration (RR) varied markedly during the year with the highest rates between June to August, and the lowest rates between December to January. The soil temperature was the main factor that affected RS and its components, while there was no significant relationship between soil water content and soil respiration flux. The estimated RS, RR and RH values for PP2 were 1 147.41 g· m-2, 506.72 g·m-2 and 640.69 g·m-2 respectively in average, and the estimated RS, RR and RH values for MP2 were 844.07 g·m-2, 136.87 g·m-2 and 707.21 g· m-2 in average. The estimated RC increased from 56.03% in the PP2 to 83.94% in the MP2. There was significant correlation between litterfall mass, fine root biomass, C/N ratio of litterfall and RS and RR. However, there was just significant relationship between RH and total organic carbon of soil and litterfall.
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Study on the Soil Respiration and Its Components of the Second Rotation Eucalyptus Plantations in Subtropical China

  • 1. Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
  • 2. Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing 100083, China

Abstract: In order to determine the seasonal pattern of respiration and elucidate the contribution of respiration components and their control factors in Eucalyptus plantations, comparative experiments and the trenching plot method with LI-8100 automated CO2 flux system were used to quantify the components of soil respiration in three-4-year-old second rotation pure plantations (PP2) of Eucalyptus and three 4-year-old second rotation mixed Eucalyptus urophylla and Dalbergia odorifera plantations (MP2) in Guangxi Zhuang Autonomous Region, southern China. The results showed that there were similar seasonal dynamics for the respiration and its compoments in both the plantations. The total respiration (RS), heterotrophic respiration (RH), and autotrophic respiration (RR) varied markedly during the year with the highest rates between June to August, and the lowest rates between December to January. The soil temperature was the main factor that affected RS and its components, while there was no significant relationship between soil water content and soil respiration flux. The estimated RS, RR and RH values for PP2 were 1 147.41 g· m-2, 506.72 g·m-2 and 640.69 g·m-2 respectively in average, and the estimated RS, RR and RH values for MP2 were 844.07 g·m-2, 136.87 g·m-2 and 707.21 g· m-2 in average. The estimated RC increased from 56.03% in the PP2 to 83.94% in the MP2. There was significant correlation between litterfall mass, fine root biomass, C/N ratio of litterfall and RS and RR. However, there was just significant relationship between RH and total organic carbon of soil and litterfall.

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