中文关键词海拔团聚体稳定性酶活性微生物养分限制元素利用效率 英文关键词altitudeaggregate abilityenzyme activitymicrobial nutrient limitationelement use efficiency

作者	单位	E-mail
马寰菲	西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127	mahuanfei@stumail.nwu.edu.cn
胡汗	西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127
李益	西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127
郭垚鑫	西北大学生命科学学院, 西安 710127
任成杰	西北农林科技大学农学院, 杨凌 712100
赵发珠	西北大学城市与环境学院, 陕西省地表系统与环境承载力重点实验室, 西安 710127	zhaofazhu@nwu.edu.cn

中文摘要 为探究土壤团聚体稳定性在海拔上的变化规律及其影响因子，在太白山选取3个不同海拔的0~10 cm表层土壤为对象，测定并分析其土壤团聚体分布、土壤理化性质、微生物量和胞外酶等相关因子的变化特征.结果表明：①土壤团聚体平均重量直径（MWD）在锐齿栎林、辽东栎林和红桦林这3个海拔梯度上的值分别为2.17 mm、1.83 mm和1.82 mm；几何平均直径（GMD）分别为1.66 mm、1.39 mm和1.32 mm，表明土壤团聚体稳定性随海拔的上升而减弱；②土壤团聚体稳定性在海拔上的变化主要受到了土壤胞外酶活性的影响，其中，中团聚体的乙酰氨基葡萄糖酶（NAG）和微团聚体的β-葡萄糖苷酶（BG）是主要影响因子；③微生物通过调节胞外酶的相对产量和改变元素利用效率使高海拔的N限制状况得以改善，也会影响土壤团聚体稳定性在海拔上的变化.本研究结果对于太白山森林生态系统的土壤质量评价和生态环境的保护具有重要意义. 英文摘要 To explore changes in soil aggregate stability along an elevation gradient, and its regulating factors, soil samples were taken from the 0-10 cm surface layer at 3 different elevations on Taibai Mountain. We measured and analyzed the distribution of soil aggregates, physical and chemical properties, microbial biomass, and extracellular enzymes. The results showed that: ① the soil aggregates from the 3 elevations had mean weight diameters (MWD) of 2.17 mm, 1.83 mm, and 1.82 mm (increasing elevation), and geometric mean diameters (GMD) of 1.66 mm, 1.39 mm, and 1.32 mm, respectively. ② The change in soil aggregate stability along an elevation gradient was regulated by extracellular enzymes in the soil, in particular, the LAP in soil meso-aggregate and the BG in soil micro-aggregate. ③ Microorganisms can alleviate the N limitation at high elevations by adjusting the relative production of extracellular enzymes and altering nutrient utilization efficiency, which also changes soil aggregate stability along an elevation gradient. The results of this study have important scientific significance for soil quality evaluation and ecological environment protection in Taibai Mountain.

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