采伐对小兴安岭落叶松森林沼泽土壤氮含量和氮密度的影响  

Effects of Harvesting on Soil Nitrogen Contents and Density of Forested Wetlands in Xiaoxing'an Mountains, Northeast China

作　　者：刘夏[1] 牟长城[1] 谭稳稳 

机构地区：[1]东北林业大学生态研究中心,哈尔滨150040 [2]中国科学院东北地理与农业生态研究所,长春130102

出　　处：《土壤通报》2013年第6期1408-1413,共6页Chinese Journal of Soil Science

基　　金：黑龙江省科技计划项目(GA09B201-02);"十二五"农村领域国家科技计划项目课题(2011BAD08B02-04)资助

摘　　要：研究了择伐和皆伐对小兴安岭三种森林沼泽土壤氮含量和氮密度的影响。研究结果表明：不同森林沼泽类型的土壤氮含量和氮密度对不同采伐强度的响应不同，采伐对不同土层的氮含量和氮密度的影响也存在差异。（1）采伐一般使落叶松苔草沼泽土壤层的氮含量有所降低，且随着采伐强度增大降低幅度增加；采伐改变了落叶松藓类沼泽土壤层氮含量的分布格局，但对其土壤各层氮含量的影响并不大；采伐虽然对落叶松泥炭藓沼泽土壤氮含量的分布格局有较大影响，但对其各层土壤氮含量的影响相对较弱。（2）就0—50cm土体的氮密度而言，相对于对照样地，落叶松苔草沼泽择伐后减低1．9％，皆伐后降低40．6％；落叶松藓类沼泽择伐后降低8．8％，皆伐后降低18．3％；落叶松泥炭藓沼泽择伐后增加27．3％，皆伐后降低25．7％。The effects of two harvesting practices （i.e., thinning cutting and clear cutting） on soil nitrogen content and nitrogen density of three types of forested-wetlands in Xiaoxing＇an Mountainwere were investigated. The results showed that the soil nitrogen content and density were affected by wetland types.And harvesting intensity and harvesting-induced changes were different among soil layers. Generally, soil nitrogen contents were gradually reduced with the harvesting intensity at LC swamp. At LM swamp and LS magellanicum swamp, the distribution patterns of soil nitrogen content were greatly changed, and significant differences in soil nitrogen content were not observed. Comapred to the control treatment, thinning cutting and clear cutting practices decreased soil nitrogen denisty at the depth of 0 50 em at LCswamp by 1.9% and 40.6%, respectively. At LM swamp, the soil nitrogen density was also reduced by 8.8% and 18.3% with these two practices. At LS swamp, however, the soil nitrogen density increased by 27.3% in thin cutting treatment and decreased by 25.7% in clear cutting treatment.

关 键 词：森林沼泽 择伐 皆伐 氮含量 氮密度 

分 类 号：S153.6[农业科学—土壤学]