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基于生态恢复红壤区林地和耕作农地的现场实验,以土壤微生物体系为研究对象,通过分析测试土壤微生物数量、土壤呼吸强度、土壤酶活性等参数,综合探讨生态恢复红壤区土壤微生物活性的变化特征。结果表明,生态恢复时间分别为34、26、15、10年的4个林地的土壤有机碳、全氮、全磷等不同养分含量和C/N比值明显高于2个农地,且生态恢复时间越长,土壤养分含量越高,C/N值越大;综合土壤微生物(细菌、放线菌和真菌)数量、土壤呼吸强度、土壤酶(蛋白酶、脲酶、过氧化氢酶)等多个衡量土壤微生物活性的重要指标,生态恢复林地的土壤微生物活性均明显高于农地,且生态恢复时间越长,土壤微生物活性越强。不同生态恢复时间的林地之间土壤微生物活性的差异并不显著,表明在南方红壤区较为适宜的水热条件,较短时间即可重建并恢复土壤生态系统动态平衡。
Based on the field experiments of ecological restoration of forestland and farmland in the red soil region, taking the soil microbial system as the research object, the changes of soil microbial activity were analyzed comprehensively by analyzing the parameters of soil microbial quantity, soil respiration intensity and soil enzyme activity feature. The results showed that the soil organic carbon, total nitrogen, total phosphorus and other nutrient contents and C / N ratios of four forestlands with ecological recovery time of 34, 26, 15 and 10 years were significantly higher than those of the two agricultural lands, and the ecological restoration The longer the time, the higher the soil nutrient content, the higher the C / N value. The number of soil microbes (bacteria, actinomycetes and fungi), soil respiration, soil enzymes (protease, urease and catalase) Soil microbial activity is an important indicator of soil microbial activity, the ecological activity of soil microbial activity were significantly higher than farmland, and the longer the ecological restoration, the stronger the activity of soil microorganisms. The differences of soil microbial activities between the forestlands with different restoration time were not significant, which indicated that the more suitable hydrothermal conditions in the red soil areas in the south could reconstruct and restore the soil ecosystem dynamic balance in a short period of time.