Huang Zhiyu, Chen Jiao, Ai Xiaoyan, Li Ruirui, Ai Yingwei, Li Wei
Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, 610064, China.
College of Life Sciences, Sichuan Normal University, Chengdu, Sichuan, 610066, China.
J Environ Manage. 2017 Sep 15;200:502-510. doi: 10.1016/j.jenvman.2017.05.043. Epub 2017 Jun 15.
Outside soil spray seeding (OSSS) is widely used to restore cut slopes in southwest of China, and artificial soil is often sprayed onto cut slopes to establish a soil layer for revegetation. The stability of artificial soil layer and its supply of water and nutrients for plants is crucial for successful restoration. To evaluate the long-term effectiveness of OSSS, the texture, structure and nutrient availability of artificial soil were studied, various soil samples were obtained from three cut slopes with different restoration time (restored with OSSS in 1996, 2003 and 2007 respectively) and one natural developed slope (NS). The properties measured including soil particle size distribution (PSD), texture, fractal dimension of PSD (D), the bias (C) and peak convex (C) coefficients of aggregate size distribution, structure failure rate, bulk density, moisture, pH, soil organic carbon (SOC), calcium carbonate content, Available nitrogen (N), Available phosphorus (P), and Available potassium (K). The results showed that different restoration time resulted in significant differences in soil PSD, D, C, C, structure failure rate, bulk density, moisture, pH, N, and K. And these properties improved with increasing restoration age. However, there is still a huge disparity in soil texture, structure, and the availability of nutrients and moisture between the cut slopes and NS over a restoration period of up to 17 years, and this is caused by the little fine particles and the lack of slow release fertilizers and organic fertilizers in the artificial soil, resulting in poorer soil structure stability, retention and availability of moisture and nutrients on the cut slopes. Overall, the OSSS technique shows a long-term effectiveness in southwest of China, but there is still room for improvement.
外部土壤喷播（OSSS）在中国西南部被广泛用于恢复开挖边坡，通常将人工土壤喷播到开挖边坡上以建立植被生长的土层。人工土层的稳定性及其为植物提供水分和养分的能力对于恢复成功至关重要。为了评估OSSS的长期效果，研究了人工土壤的质地、结构和养分有效性，从三个具有不同恢复时间（分别于1996年、2003年和2007年采用OSSS恢复）的开挖边坡和一个自然发育边坡（NS）获取了各种土壤样本。测量的属性包括土壤颗粒大小分布（PSD）、质地、PSD的分形维数（D）、团聚体大小分布的偏差（C）和峰值凸度（C）系数、结构破坏率、容重、湿度、pH值、土壤有机碳（SOC）、碳酸钙含量、有效氮（N）、有效磷（P）和有效钾（K）。结果表明，不同的恢复时间导致土壤PSD、D、C、C、结构破坏率、容重、湿度、pH值、N和K存在显著差异。并且这些属性随着恢复年限的增加而改善。然而，在长达17年的恢复期内，开挖边坡和NS之间在土壤质地、结构以及养分和水分有效性方面仍存在巨大差距，这是由于人工土壤中细颗粒较少以及缺乏缓释肥料和有机肥料，导致开挖边坡上土壤结构稳定性较差、水分和养分的保持及有效性较低。总体而言，OSSS技术在中国西南部显示出长期有效性，但仍有改进空间。
