摘要
对福建省大武夷山常绿阔叶林野外站三明观测点的35年生米槠天然更新次生林皆伐后采伐剩余物进行不同处理(火烧LB、保留LR)后表层土壤(0—10 cm)主要生化特性、芳香性指数、腐殖化程度以及酶活性进行研究。结果表明:半年后,与LB相比,LR土壤可溶性有机碳、可溶性有机氮和微生物量碳含量分别增加92%、105%和39%,土壤有效磷含量和代谢熵值下降42%和68%,土壤酸性磷酸酶、β-葡萄糖苷酶和纤维素水解酶活性增加了3.3倍、2.8倍和2.1倍,酚氧化酶活性下降了34%(P<0.05)。LR土壤芳香性指数(4.99±2.39)较低,腐殖化指数(1.72±0.01)较高,但与LB均无显著差异(P>0.05)。1a后,LB除土壤β-葡萄糖苷酶活性略有降低外,其他3种土壤酶活性较半年前均显著上升。土壤有机碳、全氮、可溶性有机碳氮、有效磷、土壤碳矿化速率和土壤腐殖化指数较半年时显著下降,其中土壤可溶性有机碳含量减少近80%,代谢熵减少近68%(P<0.05)。LR土壤芳香性指数(10.58±0.34)较半年前显著增加(P<0.05)。处理1a后LB土壤有效磷含量(1.71±0.12)mg/kg显著高于LR,但LR土壤可溶性有机碳、可溶性有机氮含量和土壤碳矿化速率较LB仍明显更高(P<0.05)。可见,采伐剩余物不同处理对森林土壤质量存在不同程度的影响,保留采伐剩余物有利于改善林地水热条件和养分循环,对地力的维持有利。
Changes of surface soil biochemical properties, aromaticity index, humification degree and enzyme activity for half a year and one year were studied in different logging residue treatments in a clear-cut 35-year-old secondary Castanopsis carlesii forest. Logging residue treatments included residue burned （LB） and residue remained （LR）. The research results showed that： after six months, in comparing with LB, soil dissolved organic C, dissolved organic N and microbial biomass C contents in the LR increased by 92%, 105% and 39% respectively. Soil acid phosphatase, β-1,4-glucosidase and cellobiohydrolase activities increased by 3.3, 2.8 and 2.1 times. But soil available P content and metabolic quotient in the LR decreased by 42% and 68%. Phenol oxidase activity decreased by 34% （P 〈 0.05 ）. Compared with the LB, soil aromaticity index （4.99±2.39） was much lower and humification index （1.72±0.01） much higher in the LR. However, there were no significant differences in soil aromaticity index and humification index between the two treatments （P 〉 0. 05 ）. One year later, soil enzyme activities significantly increased in the LB treatment except β-1,4-glucosidase. Contents of soil organic C, total N, dissolved organic C, dissolved organic N, available P, C mineralization rate and humification index in the LB treatment decreased significantly compared with six-month values, especially dissolved organic C and metabolic quotient decreased by nearly 80% and 68%. One year after treatment, soil aromaticity index （10.58±0.34） in the LR increased significantly. Soil available P （1.71±0.12） mg/kg content in the LB was also significantly higher than in the LR, while dissolved organic C, dissolved organic N and soil C mineralization rate in the LR were much higher （P 〈 0.05）. In conclusion, surface soil properties will be influenced by different treatments of logging residue. Logging residues remained will be benefit to improve forest hydrothermal conditions, nutrient cycling of the ecosystems and helpful for soil quality maintenance.
出处
《生态学报》
CAS
CSCD
北大核心
2014年第7期1645-1653,共9页
Acta Ecologica Sinica
基金
国家自然科学基金重点项目(31130013)
关键词
采伐剩余物
土壤生化特性
酶活性
logging residue
soil biochemical property
enzymatic activity
