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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (4): 26-35.doi: 10.11707/j.1001-7488.20150404

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Effects of Different Management Measures on Soil Carbon in Bamboo Forest Ecosystems

Li Chong1,2, Zhou Guomo1,2, Shi Yongjun1,2, Zhou Yufeng1,2, Zhang Yupeng1,2, Shen Lifen1,2, Fan Yeqing1,2, Shen Zhenming3   

  1. 1. Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A & F University Lin'an 311300;
    2. The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University Lin'an 311300;
    3. Forestry Station of Lin'an City Lin'an 311300
  • Received:2013-12-26 Revised:2014-12-28 Online:2015-04-25 Published:2015-05-20

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Abstract:

【Objective】 Moso bamboo is a very important forest resource in Zhejiang province and China. It has excellent carbon sequestration potential and can play an important role in coping with climate change. The international society have gradually recognized REDD + forest carbon sequestration mechanism and greatly expanded the development space of forest carbon sinks and also brought opportunities and challenges for China's bamboo management in recent years. In this study, vegetation biomass carbon pool was changed to affect soil carbon pool through bamboo forest management. The two-factor randomized block design was used to eliminate the influence of topographical factors and two management measures (fertilization and cutting) were applied to investigate the changes in soil organic carbon (SOM) concentration and carbon (C) storage in bamboo forest ecosystems during the period from 2010 to 2013. The results showed that under different treatments, the greatest changes in SOM concentration ranged between -0.52 (± 0.62)% and 0.75 (± 0.44)% in 0-10 cm soil layer. Significant differences (P<0.01) in SOM concentration changes were found in treatments of A2B3 (intermediate fertilization level with low-intensity cutting measure) and A1B1 (high fertilization level with high-intensity cutting measure). Total SOM storage of the intermediate fertilization level increased as much 3.61 times and 5.05 times greater than those of the high fertilization level and no fertilization treatments, respectively. There was significant (P<0.05) difference in SOM storage changes at 0-10 cm soil layer between high fertilization level and intermediate fertilization level. Total SOM storage of the low-intensity cutting treatment increased as much 5.51 times and 1.63 times greater than those of the high intensity cutting measure and medium intensity cutting measure, respectively. There was significant (P<0.05) difference in SOM storage changes in 0-10 cm soil layer between high intensity cutting and low-intensity cutting treatment. For different treatments, the changes of total SOM storage were between -15.56 (±10.21) tC ·hm-2 and 53.15 (± 37.81) tC ·hm-2. Among the treatments, the difference of SOM storage changes was significant (P<0.01) between A2B3 (intermediate fertilization level with low-intensity cutting measure) and A1B1 (high fertilization level with high intensity cutting measure). The effect figure indicated that the A2B3 treatment (intermediate fertilization level with low-intensity cutting measure) was the best effect in both SOM concentration and storage changes in 0-50 cm soil layer while A1B1 (high fertilization level with high intensity cutting measure) treatment showed a worst effect in that soil layer. Even though the high fertilization level with high intensity cutting measure had guaranteed a large amount output of bamboo timber, it interrupted the original bamboo forest ecological structure, and also had adverse impact on both SOM concentration and carbon storage. Thus, from the carbon sink accumulation of moso bamboo forest ecosystem, it was not a desirable management measure. We will set several horizontal gradients near the intermediate fertilization level to find out the most reasonable fertilizing amount based on test results. With the extension of time, the test result in fixed sample will be hoping to make a more accurate and thorough explanation of the SOM changes under different management measures. Meanwhile, different management measures will not only impact on soil carbon pool, but also change vegetation carbon pool significantly during bamboo forest management. and may accompany the carbon emissions and carbon leakage problem. All of those will become various factors and links in studying the comprehensive effect of different management measures on bamboo forest ecosystem carbon in the future.

Key words: bamboo, management measures, cutting intensity, fertilization amount, soil organic carbon concentration, soil organic carbon storage

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