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A Study On The Soil Respiration Rate Of Pinus Tabulaeformis Plantation In The Growing Season In Taiyue Mountain, Shanxi Province, China

Posted on:2012-04-14Degree:MasterType:Thesis
Country:ChinaCandidate:B X LiuFull Text:PDF
GTID:2143330335467511Subject:Ecology
Abstract/Summary:PDF Full Text Request
Forest soil respiration is is an important part of the land ecological system carbon cycle. The dynamic change has far-reaching influence on global carbon cycle. Tending management is an important measure to improve the quality of plantation. Tending is an important cutting measures.Therefore, study on the influence of different tending intensity sites to the forest soil respiration has certain theoretical and practical significance.With a LI-8100 system and the sensors the Pinus tabulaeformis planted forest soil respiration rate and the soil temperature and the moisture at depth of 10 cm were monitored after tending in various intensity sites at Taiyue Mountain in Shanxi Provence. At the same time, with a LI-8150 system and the sensors,the soil respiration rate and the temperature and the moisture at the depth of 0 and 10cm of a Pinus tabulaeformis planted forest sample without human interference was measured. The result showed that The purpose of the research is to study soil respiration rate changes after three different treatments and the main influencing factors.The result showed:1) The soil respiration rates without litter and root had no significant difference (p>0.05), while the soil respiration rates with root had significant difference (p<0.05); 2) The soil respiration rates under the processing strength of 20%,30% and 40% were significant higher than contrast (p<0.05) in June and July; 3) The soil respiration rates with litter and root also had significant difference (p<0.05). The soil respiration rates under the processing strength of 30% and 40% were significant higher than contrast (p<0.05) in June and July; 4) The soil temperature and moisture was correlated with the soil respiration rate (p<0.01), and they together explanted the soil respiration rate changes of 30~74 percent.5) The soil respiration rate of Pinus tabulaeformis planted forest without human interference grew with the rise of the temperature, to to reach a maximum in July, and because of the influence of rain, the rate weakened in August. After September it weakened gradually mainly affected by the influence of temperature drop. The soil temperature and moisture was correlated with the soil respiration rate(p<0.01), and they together explanted the soil respiration rate changes of 68~88 percent. The surface temperature and moisture also had significant correlation with the soil respiration rate (p<0.01).6) Through the observation of the canopy layers CO2 flux at different heights, the results showed that the Pinus tabulaeformis planted forest ecological system performed as a carbon source during the whole growing season. It means that the absorbs of CO2 was less than the release of the CO2 during the whole growing season. The CO2 flux increased from April, and decreased afer August. The CO2 fluxes at different heights have obvious difference:maximum at the surface, and minimum above the canopy layers.
Keywords/Search Tags:Pinus tabulaeformis planted forest, soil respiration rate, soil temperature, soil moisture, tending intensity sites
PDF Full Text Request
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