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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 intensive management time was 5, 10, 15, 20 a, and the evolution of functional diversity of soil organic carbon and microorganism in Hickory was analyzed.The results showed that after the natural mixed forest was transformed into pure Hickory and managed intensively, TOC, MBC and WSOC decreased significantly, but the stability of organic carbon pool was enhanced.Compared with natural Hickory-broadleaf mixed forest (0 a) The contents of TOC, MBC and WSOC decreased by 28.4%, 34.1% and 53.3% respectively after 20 days and decreased by 38.6%, 48.9% and 64.1% respectively after 20 years. The contents of aromatic carbon and phenolic carbon in soil organic carbon And the carbonyl carbon ratio increased, the aromaticity increased by 23.0%. The strength management of pecan reduced the functional diversity of soil microorganism, and the average color change rate (AWCD) value of soil microbial activity at 0, 5 a and 10, 15, 20 a Significantly, Shannon index (H) and evenness index (E) were significantly different between 0 and 5 years and 15 and 20 years, and all six indexes of TOC, WSOC, MBC, AWCD, Significant correlation.