不同施肥量对樟树与湿地松土壤氮矿化速率的影响
赵大勇 1,3闫文德 1,2,3田大伦 1,2王光军 1,2郑威 1,4梁小翠 1,3

1.中南林业科技大学,湖南长沙 410004;2.南方林业生态应用技术国家工程实验室,湖南长沙 410004; 3.城市森林生态湖南省重点实验室,湖南长沙 410004;4.国家野外科学观测研究站,湖南会同 418307

樟树;湿地松;树脂芯法;氮矿化速率;施肥

Effects of nitrogen fertilizer on nitrogen mineralization rate in soils of Cinnamomum camphora and Pinus elliottii
ZHAO Da-yong1,3,YAN Wen-de1,2,3,TIAN Da-lun1,2,WANG Guang-jun1,2,ZHENG Wei1,4,LIANG Xiao-cui1,3

1.Central South University of Forestry & Technology, Changsha 410004, Hunan, China; 2. National Engineering Lab. for Applied Technology of Forestry & Ecology in South China, Changsha 410004, Hunan, China; 3. Key Lab. of Urban Forest Ecology of Hunan Province, Changsha 410004, Hunan, China; 4. National Field Station for Scientific Observation and Experiment, Huitong 418307, Hunan, China

Cinnamomum camphora; Pinus elliottii; resin-core technique; nitrogen mineralization rate; fertilization

备注

2010年 6月,在湖南省植物园采用树脂芯原位测定法,对樟树和湿地松 2种群落进行 3种施氮肥处理 (LN:5 g•m-2;MN:15 g•m-2;HN:30 g•m-2),并各设置一个对照 (CK)即不做施肥处理,比较了 3种处理对樟树和湿地松群落土壤中无机氮含量及氮矿化速率。结果 表明:樟树和湿地松群落土壤氮矿化速率表现出不同的规律,樟树为 MN(-1.30 mg•k-1•d-1)<LN(-1.11 mg•kg-1•d-1)<HN(-0.94 mg•kg-1•d-1)<CK(-0.89 mg•kg-1•d-1),湿地松为 CK(-1.23 mg•kg-1•d-1)<HN(-1.15 mg•kg-1•d-1)<LN(-0.91 mg•kg-1•d-1)<MN(-0.83 mg•kg-1•d-1)。研究表明施氮肥对樟树群落土壤氮矿化速率产生了抑制性作用,对湿地松群落土壤则为促进作用。

On June 2010, the nitrogen mineralization contents and nitrogen mineralization rates in the soils of Cinnamomum camphora & Pinus elliottii plantations in Hunan Botanical Garden were evaluated and compared with three nitrogen treatments (LN:5 g·m-2, MN:15 g·m-2, HN:30 g·m-2) setting a control (no fertilization) for them respectively. The results show that there were different laws in soil N mineralization rates of the two plantations, C.camphora‘s law was: MN (-1.30 mg·kg-1·d-1)<LN (-1.11 mg·kg-1·d-1)< HN(-0.94 mg·kg-1·d-1)<CK(-0.89 mg·kg-1·d-1); P.elliottii‘s law was: CK(-1.23 mg·kg-1·d-1)<HN(-1.15 mg·kg-1·d-1)<LN(-0.91 mg·kg-1·d-1)< MN (-0.83 mg·kg-1·d-1). The findings reveal that the nitrogen fertilization had produced inhibitory effects on the nitrogen mineralization rate in soils of C. camphora, and produced promoting effect on the soils of P. elliottii.