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林龄对侧柏人工林碳储量以及细根形态和生物量的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2013年02期
Page:
21-27
Column:
森林生态系统碳储量及碳密度研究专栏
publishdate:
2013-03-31

Article Info:/Info

Title:
Effects of stand ages on carbon storage, fine root morphology and biomass in Platycladus orientalis plantation
Author(s):
LI Ruixia LING Ning HAO Junpeng MIN Jiangang CHEN Xinli GUAN Qingwei*
College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
Keywords:
Platycladus orientalis plantation carbon storage stand age fine root biomass fine root morphology
Classification number :
S718
DOI:
10.3969/j.issn.1000-2006.2013.02.004
Document Code:
A
Abstract:
The research focused on Xuzhou Platycladus orientalis plantation, to study the changes on carbon storage of the ecosystem and related mechanism in different stand ages(40, 48 and 55-yr-old)by applying biomass transformative equation and soil survey data. The results were as follows:(1)The percentage of carbon storage in tree layer rised with the increase of stand age. On contrast, the proportion of soil carbon storage was decreased. The carbon storage of the shrub, herb and floormass had no changes with the increase of stand age, while the whole ecosystem carbon storage rised with growing stand age. The total carbon storage of 55-yr-old stand was 109.55 t / hm2, respectively 1.22 times and 1.09 times as much as that of 40-yr-old stand and 48-yr-old stand. Yet, this difference was mainly caused by the different carbon storage of tree layer and soil layer.(2)Fine root biomass indicated that the 1st-3rd root order biomass was found non-significantly changed. Although the 4th-5th root order and total biomass significantly decreased with stand age. Fine root morphology showed: compared with 40-yr-old stand, in the surface soil layer, the diameter of 5th root order significantly decreased, while the root length of 5th root order and specific root length of 1st root order significantly increased in the 48-yr-old stand. The diameter and root length of 4th root order, and the specific root length of 1st root order significantly increased in the 55-yr-old stand. In the subsurface soil layer, the diameter of 3rd root order and the root length of 4th root order significantly increased, but the specific root length of 1st and 2nd root order significantly decreased in the 48-yr-old stand. The diameter of 3rd - 5th root order and the length of 5th root order significantly increased, although the length of 3rd root order and the specific root length of 1st and 5th root order significantly reduced in the 55-yr-old stand.(3)The relationship between the diameter of 3rd root order and soil carbon storage was significant negatively correlated, but the diameter of 5th root order positively correlated with total ecosystem carbon storage. The specific root length of 2nd and 3rd root order significant positively correlated with soil carbon storage, while the specific root length of 3rd root order significant negatively correlated with tree layer carbon storage and litter layer carbon storage and ecosystem carbon storage. The biomass of 4th and 5th root order with litter layer carbon storage significant positively correlated, and with soil carbon storage in very significant negative correlation. Total fine root biomass significantly positive correlated with tree layer carbon storage and total carbon storage, and positively correlated with shrub layer carbon storage and herb layer carbon storage. As the results, the changes of fine root morphology and biomass may be one of the factors that cause the changes of ecosystem carbon storage.

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Last Update: 2013-03-31