不同经营年限对山核桃林地土壤轻重组有机碳的影响  

Years of cultivation along with light and high fractions of soil organic carbon in a Carya cathayensis forest

作　　者：盛卫星[1] 吴家森[2] 徐建春 张少伟 蔡建荣[1] 

机构地区：[1]浙江省建德市林业局,浙江建德311600 [2]浙江农林大学环境与资源学院,浙江临安311300 [3]浙江省开化县林业局,浙江开化324300 [4]浙江省建德市新安江林场,浙江建德311600

出　　处：《浙江农林大学学报》2015年第5期803-808,共6页Journal of Zhejiang A&F University

基　　金：浙江省科学技术重点科技创新团队资助项目(2009R50033)

摘　　要：为探讨不同集约经营历史山核桃Carya cathayensis林地土壤轻重组有机碳的演变规律,在浙江省临安市分别采集了集约经营历史为5,10,15,20 a的山核桃林土壤样品,并与天然山核桃-阔叶混交林（0 a）进行比较。结果表明：天然混交林改造为山核桃纯林并经强度经营后,土壤有机碳的变化主要发生在表层（0~10 cm）,表层土壤总有机碳（SOC）,轻组有机碳（LFOC）,重组有机碳（HFOC）质量分数均呈下降趋势,与0 a相比,经过5 a经营后,土壤SOC,LFOC,HFOC分别下降了28.4%,59.3%和15.1%,而20 a后,则分别下降了38.6%,68.2%和26.0%。经营前5 a,LFOC/SOC从23.0%下降为17.0%,而HFOC/SOC则从从70.0%上升到83.0%,在后期的经营过程中,轻重组有机碳占总有机碳的比例保持相对稳定。Forests of Carya cathayensis （Chinese hickory）, a unique tree species with seeds that produce high- grade oil. Intensive management including heavy application of. chemicat fertilizer and long-term application of herbicides has resulted in serious soil organic carbon （SOC） decrea. To evaluate what kind of composition of SOC decrea, soil samples collected from intensively-managed forests （IMF） of 5, 10, 15, and 20 years were compared to samples of IMF forests newly converted （year O） from an evergreen and deciduous broadleaf forest （EDBF）. The results indicated that SOC, light fraction organic carbon （LFOC）, and high fraction organic car- bon （HFOC） decreased after converting an EDBE to an IMF. Compared to the EDBF, in the Chinese hickory forest with 20 years intensive management, there was a decrease in SOC （38.6%）, LFOC （68.2%）, and HFOC （26.0%）. After 5 years of intensive management, LFOC/SOC decreased from 23.0% to 17.0%; whereas HFOC/ SOC increased from 70.0% to 83.0%. The results demonstrate that LFOC is the main composition of SOC de- creased after converting an EDBE to an IMF. [Ch, 3 fig. 2 tab. 26 ref.]

关 键 词：森林土壤学 轻组有机碳 重组有机碳 山核桃 

分 类 号：S714.5[农业科学—林学]