Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, PR China.
College of Life Sciences, Sichuan Normal University, Chengdu, Sichuan 610066, PR China.
J Environ Manage. 2018 Apr 1;211:287-295. doi: 10.1016/j.jenvman.2018.01.005. Epub 2018 Feb 4.
Large-scale railway construction has resulted in large areas of bare-cut-slope, and outside soil spray seeding (OSSS), a frequently used technique, has been adopted for slope restoration for many years. However, compared with natural slope soils, the quality of artificial soils on rock-cut slopes is low. Enzyme activity and microbial biomass are the main indices used for estimating soil quality; thus, our objective was to explore the influence of slope position, slope aspect, and season on two important factors that positively influence the plant growth capability in artificial soil. Further, we suggest modifications of the proportions of OSSS ingredients, not only to manage cut slopes more economically but also to provide a new framework for managing desertification. We chose a bare-cut-slope that had been restored five years ago near the Suiyu Railway (Chongqing-Suining), in Sichuan Province, China, as our study plot. Soil samples were collected at a depth of 10 cm. We conclude that natural slopes exhibited higher urease, sucrase, and catalase activity and higher microbial biomass than cut slopes. The protease and polyphenoloxidase enzyme activities and the microbial biomass were higher on the cut slopes in the months of October and January, with the highest protease activity in October, and the highest polyphenoloxidase activity in January. The enzyme activity and microbial biomass were always lower on lower slopes, with the exception of polyphenoloxidase activity. The slope aspect influenced soil enzyme activity, resulting in higher activity on north-facing slopes than on south-facing slopes. These results provided scientific support for artificial revegetation methods in an ecological context.
大规模的铁路建设导致了大面积的裸岩边坡，多年来，外部土壤喷播（OSSS）已被广泛应用于边坡恢复。然而，与天然边坡土壤相比，岩质边坡上的人工土壤质量较低。酶活性和微生物生物量是评估土壤质量的主要指标；因此，我们的目标是探讨坡位、坡面朝向和季节对人工土壤中两个重要因素的影响，这两个因素对植物生长能力有积极影响。此外，我们建议修改 OSSS 成分的比例，不仅可以更经济地管理边坡，还可以为治理荒漠化提供新的框架。我们选择了四川省遂渝铁路（重庆-遂宁）附近一个五年前修复的裸岩边坡作为研究点。在 10cm 深处采集土壤样本。我们的结论是，自然边坡的脲酶、蔗糖酶和过氧化氢酶活性以及微生物生物量均高于人工边坡。在 10 月和 1 月，人工边坡的蛋白酶和多酚氧化酶活性以及微生物生物量较高，其中蛋白酶活性最高的月份是 10 月，多酚氧化酶活性最高的月份是 1 月。除了多酚氧化酶活性外，酶活性和微生物生物量在较低的坡位总是较低。坡面朝向影响土壤酶活性，导致北坡的酶活性高于南坡。这些结果为生态背景下的人工植被恢复方法提供了科学支持。
