山核桃集约经营过程中土壤微生物量碳氮的变化  

Changes in Soil Microbial Biomass Carbon and Nitrogen of Carya Cathayensis Plantations Under Intensive Managements

作　　者：邵香君 徐建春 吴家森[3] 沈振明 

机构地区：[1]浙江省临安市林业种苗管理站,浙江临安311300 [2]浙江省开化县林业局,浙江开化324300 [3]浙江农林大学浙江省森林生态系统碳循环与固碳减排重点实验室,浙江临安311300 [4]浙江省临安市林业科技推广总站,浙江临安311300

出　　处：《水土保持通报》2016年第2期72-75,81,共5页Bulletin of Soil and Water Conservation

基　　金：浙江省科技厅项目"浙江省果品产业创新团队项目"(2009R50033)

摘　　要：[目的]研究不同集约经营历史山核桃林的土壤微生物量碳氮的演变规律,为山核桃林地土壤管理提供科学依据。[方法]在浙江省临安市分别采集并分析了经营历史为5,10,15,20a的山核桃林土壤样品,并与天然混交林(0a)进行比较。[结果]天然混交林改造为山核桃纯林并经集约经营后,林地土壤微生物量碳(MBC)、微生物量氮(MBN)、MBC/MBN,MBC/SOC均表现出先下降而后上升的趋势,经过10a经营后降到最低水平,与0a相比,0—10cm土层MBC,MBN和MBC/SOC分别降低了52.1%,32.0%和31.0%。经营10a的林地土壤MBC/MBN显著低于前期经营林地,而MBN/TN在经营过程中的差异并不显著。[结论]山核桃集约经营后,林地土壤微生物量碳氮含量显著下降。[-Objective] The differences of soil microbial biomass carbon（MBC） and microbial biomass nitrogen （MBN） in Carya cathayensis stands with different management intensification were explored to provide sci- entific basis for soil management. [Methods] Soil MBC and MBN collected from four intensive-managed for- ests（IMF） （5, 10, 15 and 20 years, respectively） were assayed and compared with the corresponding values of natural broadleaf forest（0 year）. [Results] Soil MBC and MBN, MBC/MBN and MBC/SOC decreased sig- nificantly at the first 10 years after conversion from evergreen and deciduous broadleaf forest（EDBE） to in tensive-managed forest（IMF）, and then increased slowly. In comparison with the corresponding value of EDBF（0 year）, MBC, MBN and MBC/SOC in 0-10 cm soil layer of chinese hickory forest with 10 year in- tensive management decreased by 52. 1%,32.0% and 31.0%, respectively. These indices were also lower than those corresponding values of stands with other intensive management years. Soil MBC/MBN with 10- year intensive management was lower than the values of stand before 10-years; Soil MBN/TN remained sta- ble under different years. [Conclusion] Soil MBC and MBN of Carya cathayensis stands decreased remark- ably after intensive-management was conducted.

关 键 词：微生物量碳 微生物量氮 微生物量碳氮比 山核桃 

分 类 号：S714.8[农业科学—林学]