| 樟树人工林土壤氮矿化对改变凋落物输入的响应 |
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| 引用本文： | 邓华平,王光军,耿赓.樟树人工林土壤氮矿化对改变凋落物输入的响应[J].北京林业大学学报,2010,32(3):47-51. |
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| 作者姓名： | 邓华平 王光军 耿赓 |
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| 作者单位： | 1 中国林业科学研究院林业研究所 2 中南林业科技大学生命科学与技术学院 3 河南省信阳市南湾实验林场 |
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| 基金项目： | "十一五"国家科技支撑计划项目 |
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| 摘 要： | 2007年7月至8月,在长沙天际岭林场,用树脂芯原位法测定去除凋落物、添加凋落物对樟树人工林土壤无机氮含量及氮矿化速率的影响。结果表明:樟树林凋落物处理7个月后,去除、添加凋落物和对照处理土壤中无机氮含量之间差异显著(P﹤0.05),表现为添加凋落物(18.96mg/kg)对照(16.36mg/kg)去除凋落物(10.99mg/kg)。经过28d的培养,3种处理土壤中NO3--N含量培养前后之间的差异均显著(P﹤0.05),NO3--N含量从培养前的0.67、0.51和0.39mg/kg分别上升到3.10、7.11和6.67mg/kg;NH4+-N含量培养前后之间的差异不显著(P﹥0.05)。3种处理土壤的净氮矿化量均为正值,分别增加了4.83、1.45和1.26mg/kg,净氮矿化速率依次为去除凋落物(0.173mg/(kg·d))对照(0.052mg/(kg·d))添加凋落物(0.045mg/(kg·d))。这一研究结果有助于更好地认识亚热带森林生态系统土壤氮循环过程。
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| 关 键 词： | 樟树人工林 凋落物 树脂芯法 氮矿化 |
| 收稿时间： | 1900-01-01 |
Response of nitrogen mineralization to litter addition and exclusion in soils of Cinnamomum camphora plantation |
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| DENG Hua-ping,WANG Guang-jun,GENG Geng.Response of nitrogen mineralization to litter addition and exclusion in soils of Cinnamomum camphora plantation[J].Journal of Beijing Forestry University,2010,32(3):47-51. |
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| Authors: | DENG Hua-ping WANG Guang-jun GENG Geng |
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| Institution: | 1 Research Institute of Forestry, Chinese Academy of Forestry, Beijing, 100091, P. R. China; 2 College of Life Science and Technology, Central South University of Forestry and Technology, Changsha City, Hunan Province, 410004, P. R. China; 3 Nanwan Experimental Forest Farm of Xinyang City, Henan Province, 464000, P. R. China. |
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| Abstract: | Nitrogen mineralization was evaluated by controlling above\|ground litter input in soils of Cinnamomum camphora plantation in the Tianjiling Forest Farm in Changsha City, southern China’s Hunan Province. Nitrogen mineralization was measured using the resin\|core technique from July 26 to August 23, 2007. The results show that after seven months with litter treatment, there was a significant difference between the inorganic nitrogen concentrations of soils treated by litter exclusion, litter addition and control (P﹤0.05), with the order of litter addition (18.96 mg/kg) > control (16.36 mg/kg) > litter exclusion (10.99 mg/kg). After 28 days’ incubation, the nitrate nitrogen concentrations had significant differences before and after incubation in three soil treatments (P﹤0.05), which rose from 0.67, 0.51 and 0.39 mg/kg before incubation to 3.10, 7.11 and 6.67 mg/kg after incubation, respectively. No significant difference was found between ammonia nitrogen concentrations before and after incubation (P﹥0.05). The net nitrogen mineralization values were positive in treatments of litter exclusion, litter addition and control, which increased by 4.83, 1.45 and 1.26 mg/kg, respectively, with the order of net nitrogen mineralization rates as follows: litter exclusion（0.173 mg/(kg·d)）> control（0.052 mg/(kg·d)）> litter addition (0.045 mg/(kg·d)). The results help us better understand the process of soil nitrogen cycle in the sub\|tropical forest ecosystems. |
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| Keywords: | Cinnamomum camphora plantation litter resin\|core technique nitrogen mineralization |
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