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为了解岷江上游山地森林/干旱河谷交错带植被恢复对土壤微生物量及酶活性的影响,以交错带森林段及其下缘地段为研究对象,选取干旱河谷段封禁造林地为参照,分析了植被恢复过程中土壤微生物量、土壤酶活性的特征及其相关关系。结果表明:在交错带中土壤微生物量碳、氮以及蛋白酶的活性均随着海拔的升高呈逐渐增加的趋势;而土壤脲酶、蔗糖酶和过氧化氢酶活性随海拔的升高先增多后减少。通过对交错带山地森林下缘3种植被恢复模式研究表明,恢复植被能显著提高土壤的养分,增加土壤的生物活性。同时,土壤微生物量碳、氮和酶活性变化均具有明显的空间层次现象,即随土层深度的增加而呈降低的趋势。相关性分析表明,土壤微生物量碳、氮和4种土壤酶活性均与土壤pH呈负相关关系,与土壤其他养分呈正相关关系,说明岷江上游山地森林/干旱河谷交错带土壤微生物量和酶活性受植被、pH值、土壤养分和含水量等因素的共同影响,可作为评价土壤肥力的指标。
In order to understand the effect of vegetation restoration on soil microbial biomass and enzyme activity in the forest / arid valley of the upper reaches of the Minjiang River, taking the forest section of the interlaced zone and its lower margin as the research object, taking the embankment of the arid valley as a reference, Characteristics of Soil Microbial Biomass and Soil Enzyme Activity and Their Correlation during the Recovery. The results showed that the activities of soil microbial biomass carbon, nitrogen and protease tended to increase with the elevation at the interlaced zone. The activities of soil urease, invertase and catalase firstly increased with the elevation cut back. The study on the restoration patterns of three vegetation types in the lower edge of the mountainous forest shows that the restoration of vegetation can significantly increase the soil nutrients and increase the biological activity of the soil. At the same time, the changes of soil microbial biomass carbon, nitrogen and enzyme activity all showed obvious spatial hierarchy, that is, decreased with the increase of soil depth. Correlation analysis showed that soil microbial biomass carbon, nitrogen and soil enzyme activities were negatively correlated with soil pH and positively correlated with other nutrients in the soil, indicating that soil microbial biomass and enzyme activity in the ecotone between forest and arid valley in the upper reaches of Minjiang River Affected by vegetation, pH, soil nutrients and water content, it can be used as an index to evaluate soil fertility.