摘要
[目的]分析短轮伐经营对桉树人工林生态系统碳、氮积蓄产生的潜在影响。[方法]以广西七坡林场短轮伐期的桉树人工林为研究对象,分析3年、5年生桉树人工林生态系统碳氮储量及其碳氮分配格局,探讨砍伐和炼山等短轮伐经营对桉树人工林生态系统碳氮损失的潜在影响。[结果]3年、5年生桉树人工林生态系统碳储量分别为128.02、155.90 t/hm2,氮储量分别为9 673.24、8 798.33kg/hm2。②3年、5年生桉树人工林土壤层碳储量分别是植被层碳储量的2.86、2.66倍,氮储量分别是植被层氮储量的31.17、41.59倍,表明短轮伐期桉树人工林生态系统的碳氮库仍主要集中在土壤层。③3年、5年生桉树干材获取对短轮伐期桉树人工林生态系统造成的碳(氮)损失比例分别为17.11%(0.83%)、19.05(0.92%)。[结论]桉树干材获取等桉树短轮伐经营行为可能使其生态系统碳损失较大,氮损失较小。
[ Objective ] To analyze the potential effects on carbon and nitrogen accumulation of eucalyptus plantation ecosystem under short ro- tation management. [ Method ] 3 years, 5 years old short-rotation eucalyptus plantation in Guangxi state-owned Qipo forestry farm were select- ed, ecosystem carbon and nitrogen storages, distribution pattern of eucalyptus plantations were analyzed, the potential impact on carbon and nitrogen loss of eucalyptus plantation ecosystem through timber acquisition and slash burning were discussed. [ Result ] The results showed that： The carbon storages in 3, 5 years old eucalyptus plantation ecosystem were 128.02, 155.90 t/hm2, nitrogen reserves as 9 673.24 kg/hm2 , 8 798.33 kg/hm2 respectively. The soil carbon storages were 2.86, 2.66 times respectively of those in vegetation layers, nitrogen reserves is 31.17, 41.59 times respectively, showed that the carbon and nitrogen pools of Short Rotation Eucalyptus plantation ecosystem were mainly in the soil layers. Timber acquisition in 3, 5 years old short-rotation eucalyptus plantation might induced ecosystem carbon （nitrogen） loss rates were 17.11% （0.83%）, 19.05% （0.92%）. [ Conclusion] In a word, the short-rotation eucalyptus industrial management such as Timber acquisition might cause large carbon loss, less nitrogen loss in the ecosystem.
出处
《安徽农业科学》
CAS
2013年第9期3961-3964,共4页
Journal of Anhui Agricultural Sciences
基金
国家自然科学资金项目"赤红壤区粘土矿物及铁铝氧化物对土壤有机碳的稳定机制"(31260121)
中国科学院战略性先导科技专项(XDA05050205)
关键词
桉树人工林
碳储量
氮储量
短轮伐经营
Eucalyptus plantations
Carbon storage
Nitrogen storage
Short-rotation industrial plantation
