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OALib Journal期刊
ISSN: 2333-9721
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贵州西部光皮桦天然次生林碳素积累及分配特征
DOI: 10.3969/j.issn.1000-2006.2014.04.010, PP. 51-56
Keywords: 碳素含量,碳密度,光皮桦,天然次生林,贵州西部
Abstract:
以贵州西部光皮桦天然次生林为对象,采用野外调查与实验室分析相结合的方法,对其碳素含量、碳密度及分配特征进行了研究。结果表明:光皮桦林生态系统碳素含量表现为乔木层(495.27g/kg)>灌木层(487.10g/kg)>草本层(456.57g/kg)>枯落物层(431.57g/kg)>0～80cm的土壤层(36.31g/kg),且差异极显著,植被层平均碳素含量为483.55g/kg;乔木不同器官碳素含量表现为干>枝>叶>根,且干和枝均表现为径阶越大,碳素含量越高;灌、草层均表现为地上>地下,土壤碳素含量随土层深度的增加而减少。生态系统碳密度为224.67t/hm2,表现为0～80cm的土壤层(201.3t/hm2)>乔木层(17.22t/hm2)>灌木层(3.14t/hm2)>枯落物层(2.49t/hm2)>草本层(0.82t/hm2),分别占生态系统碳密度的89.60%、7.53%、1.40%、1.11%和0.36%;植被层碳密度为21.18t/hm2,只占生态系统碳密度的9.29%;土壤表层(0～20cm)碳密度为76.7t/hm2,占土壤层(0～80cm)碳密度的38.08%,显著高于其他各层,有较强的表聚性。光皮桦天然次生林碳净固定量为3.58t/(hm2？a),相当于固定13.12t/(hm2？a)的co2,说明光皮桦天然次生林是大气co2重要的汇。
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