摘要
研究集约经营时间为5、10、15、20 a山核桃林的土壤有机碳和微生物功能多样性的演变规律.结果表明:天然混交林改造为山核桃纯林并经强度经营后,林地土壤有机碳(TOC)、微生物生物量碳(MBC)、水溶性有机碳(WSOC)含量显著下降,但有机碳库的稳定性增强.与天然山核桃-阔叶混交林(0 a)相比,经过5 a的强度经营,TOC、MBC、WSOC含量分别下降28.4%、34.1%和53.3%,20 a后分别下降38.6%、48.9%和64.1%,土壤有机碳组分中的芳香碳、酚基碳和羰基碳比例提高,芳香度提高了23.0%.山核桃的强度经营降低了土壤微生物功能多样性,0、5 a与10、15、20 a土壤微生物活性的平均颜色变化率(AWCD)值差异显著,Shannon指数(H)和均匀度指数(E)在0、5 a与15、20 a间差异显著.林地土壤TOC、WSOC、MBC、AWCD、H和E等6个指标两两之间均显著相关.
The change characteristics of soil organic carbon and microbial function diversity in Chinese hickory Carya cathayensis stands with different intensivemanagement durations （5, 10, 15 and 20 years） were studied. The results showed that soil total organic carbon （TOC）, microbial biomass carbon （MBC）, watersoluble organic carbon （WSOC） decreased significantly, while the stability of soil C pool increased significantly after the conversion from evergreen and deciduous broadleaf forest to intensivelymanaged forest （IMF）.TOC, MBC and WSOC in the hickory forest soil decreased by 28.4%, 34.1% and 53.3% with 5-year intensive management, and by 38.6%, 48.9% and 64.1% with 20year intensive management, respectively. The proportions of carboxyl C, phenolic C and aromatic C in the hickory forest soil all increased significantly, and the aromaticity of soil organic C increased by 23.0%. Soil microbial functional diversity decreased greatly after intensive management of Chinese hickory forest. Significant differences in average well color development （AWCD） were found between the 0- and 5-year treatments and the 10-, 15- and 20-year treatments. The microbial diversity indexes （H） and evenness indexes （E） in the 0- and 5-year treatments were much greater than in the 10- and 20-year treatments. Correlation analysis showed that there were significant correlations among soil TOC, WSOC, MBC, AWCD, H and E.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第9期2486-2492,共7页
Chinese Journal of Applied Ecology
基金
浙江省重点科技创新团队林业碳汇与计量和果品产业创新团队项目(2010R50030
2009R50033)资助
关键词
土壤有机碳
微生物生物量碳
水溶性有机碳
微生物功能多样性
山核桃
soil organic carbon
microbial biomass carbon
water soluble organic carbon
microbialfunctional diversity
Carya cathayensis.
