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研究测定了老秃顶子温带森林生态系统7个海拔土壤不同形态碳和相关水解酶、氧化还原酶活性,分析了土壤有机碳及相关酶活性沿海拔梯度的影响因素.结果表明:随海拔升高,土壤有机碳(SOC)、颗粒有机碳(POC)和可溶性有机碳(DOC)含量显著增加,而在海拔825~1233 m之间没有显著变化,DOC/SOC则显著下降;土壤α葡萄糖苷酶、β葡萄糖苷酶、木糖苷酶和纤维二糖水解酶活性显著增加;土壤SOC、POC、DOC、全氮(TN)含量及土壤含水量(SMC)与土壤水解酶活性呈显著正相关;过氧化物酶(POD)活性在低海拔(675 m)落叶松人工林显著低于其他海拔,POD活性与土壤碳氮(SOC、TN、POC、DOC)含量及SMC呈显著正相关,而土壤多酚氧化酶(PPO)活性在海拔947 m落叶阔叶林带和海拔825 m红松林中较高,且仅与土壤p H呈显著正相关,表明土壤酸度是驱动PPO酶活性的主要因素.在温带森林生态系统中,土壤养分含量和含水量是影响土壤水解酶海拔分布的重要因素.
In this study, the different forms of carbon and related hydrolase and oxidoreductase activities in seven altitudinal forests of temperate forest ecosystems were measured, and the influencing factors along the altitudinal gradient of soil organic carbon and related enzymes were analyzed. The results showed that with increasing altitude , Soil organic carbon (SOC), particulate organic carbon (POC) and soluble organic carbon (DOC) content increased significantly, but there was no significant change between 825 and 1233 m altitude, and DOC / SOC decreased significantly. Soil α-glucosidase , Β-glucosidase, xylosidase and cellobiohydrolase activity were significantly increased. Soil SOC, POC, DOC, total nitrogen (TN) content and soil moisture content (SMC) were positively correlated with soil hydrolase activity; POD activity was significantly lower in Larix gmelinii plantations at lower altitudes (675 m) than in other altitudes. There was a significant positive correlation between POD activity and soil C and N (SOC, TN, POC and DOC) and SMC The activity of phenoloxidase (PPO) was higher in deciduous broad-leaved forest with an altitude of 947 m and in Pinus koraiensis forest at an altitude of 825 m, and was only positively correlated with soil p H, indicating that soil acidity was the main factor driving PPO activity. Forest ecosystem, soil nutrient content Soil water content is an important factor affecting distribution hydrolytic enzyme elevation.