温带森林不同海拔土壤有机碳及相关胞外酶活性特征

发布时间：2018-06-10 02:03

本文选题：水解酶 + 氧化还原酶　；参考：《应用生态学报》2017年09期

【摘要】：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.
[Abstract]:The activities of different forms of carbon and related hydrolases and redox enzymes in soils of 7 elevations in the temperate forest ecosystem of old baldness were studied. The factors influencing the soil organic carbon and related enzyme activities along the coastal gradient were analyzed. The results showed that the contents of soil organic carbon (SOC), particulate organic carbon (POC) and soluble organic carbon (DOC) increased significantly with the elevation increasing, but there was no significant change in DOC / SOC between 825 and 1233 m above sea level, and the soil 伪 glucosidase, 尾 glucosidase, 伪 glucosidase and 尾 glucosidase in soil increased significantly. The activities of xylosidase and cellobiose hydrolase were significantly increased, and the content of soil SOCPOCDOC, total nitrogen (TNN) and soil water content (SMCs) were positively correlated with the activity of soil hydrolase. The POD activity of peroxidase (POD) in larch plantation at low altitude was significantly lower than that in other plantations. There was a significant positive correlation between POD activity and soil carbon and nitrogen content and SMC. The activity of PPO was higher in deciduous broad-leaved forest and 825m Korean pine forest at the altitude of 947m and 825m, and only positively correlated with soil pH, indicating that soil acidity was the main factor driving the PPO activity. In temperate forest ecosystem, soil nutrient content and water content are the important factors affecting the elevation distribution of soil hydrolase.
【作者单位】：中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院大学资源与环境学院;辽宁老秃顶子国家级自然保护区管理局;
【基金】：国家自然科学基金项目(31290222,41571130043,41571251) 中国科学院技术创新项目(201604)资助~~
【分类号】：S714

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