Wu Jia-Sen, Qian Jin-Fang, Tong Zhi-Peng, Huang Jian-Qin, Zhao Ke-Li
Ying Yong Sheng Tai Xue Bao. 2014 Sep;25(9):2486-92.
The change characteristics of soil organic carbon and microbial function diversity in Chinese hickory Carya cathayensis stands with different intensive-management durations (5, 10, 15 and 20 years) were studied. The results showed that soil total organic carbon (TOC), microbial biomass carbon (MBC), water-soluble organic carbon (WSOC) decreased significantly, while the stability of soil C pool increased significantly after the conversion from evergreen and deciduous broadleaf forest to intensively-managed 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 20-year 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 af- ter 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.
研究了不同集约经营年限（5年、10年、15年和20年）山核桃林中土壤有机碳和微生物功能多样性的变化特征。结果表明，从常绿落叶阔叶林转变为集约经营林后，土壤总有机碳（TOC）、微生物生物量碳（MBC）、水溶性有机碳（WSOC）显著降低，而土壤碳库稳定性显著增加。集约经营5年时，山核桃林土壤中TOC、MBC和WSOC分别降低了28.4%、34.1%和53.3%；集约经营20年时，分别降低了38.6%、48.9%和64.1%。山核桃林土壤中羧基碳、酚碳和芳香碳的比例均显著增加，土壤有机碳的芳香性增加了23.0%。山核桃林集约经营后土壤微生物功能多样性大幅降低。在0年与5年处理以及10年、15年和20年处理之间，平均颜色变化率（AWCD）存在显著差异。0年和5年处理中的微生物多样性指数（H）和均匀度指数（E）远高于10年和20年处理。相关性分析表明，土壤TOC、WSOC、MBC、AWCD、H和E之间存在显著相关性。
