生态护坡生境基材土壤肥力动态变化研究

发布时间：2018-11-03 07:42

【摘要】：分析植被恢复过程中基材土壤肥力,为进一步改进生境基材性能、完善植被混凝土生态防护技术提供科学依据。在湖北省宜昌市选择清江水布垭电站公路边坡(S样地)、高坝洲电站进厂公路边坡(G样地)和三峡大学图书馆后边坡(T样地)等3个植被混凝土生态修复边坡,采用系统布点法,在坡面5~10 cm深度处取环刀样,对生境基材多年份(2007-2012年)土壤主要肥力因子进行定量测定,并采用T-S模糊神经网络模型对肥力水平进行综合评价分析。结果表明:有机质S样地由13.34 g/kg增加至32.89 g/kg,G样地由14.78 g/kg增加至35.02 g/kg,T样地在5.65~22.87 g/kg缓慢、波动增长;土壤全氮含量S样地0.12~2.27 g/kg,G样地0.13~1.64 g/kg,T样地0.08~0.84 g/kg;速效氮含量S样地23.94~170.87 mg/kg,G样地31.70~237.51 mg/kg,T样地20.88~122.28 mg/kg;全磷变化范围S样地2.30~2.66 g/kg,G样地1.64~2.06 g/kg,T样地1.63~2.18 g/kg;速效磷S样地2007、2009年异常丰富,均在300 mg/kg以上,其余年度为36.23~154.29mg/kg,G、T样地变化规律与S样地类似;速效钾G样地波动范围在59.87~207.03mg/kg,S样地、T样地波动幅度较小且总体处于丰富水平。各样地综合肥力指数随着监测时间的推移,总体是逐渐减小趋于稳定,综合肥力指数S样地3.14~2.69,G样地3.25~2.73,T样地3.47~2.74。总体上各样地综合肥力水平呈现先增长后稳定的发展趋势,肥力综合等级处于中等向上水平。
[Abstract]:The analysis of soil fertility in the process of vegetation restoration provides scientific basis for further improving the performance of base material and improving the ecological protection technology of vegetation concrete. In Yichang, Hubei Province, three vegetation concrete ecological restoration slopes, such as the highway slope of Qingjiang Shuibuya Hydropower Station (S sample site), the highway slope of Gaobazhou Hydropower Station (G sample) and the back slope of the three Gorges University Library (T sample site), are selected for ecological restoration of the slope. The soil main fertility factors in different years (2007-2012) of habitat materials were measured quantitatively by the method of systematic collocation and sampling at the depth of 5 ~ 10 cm on the slope surface. T-S fuzzy neural network model was used to evaluate the fertility level. The results showed that the organic matter S plot increased slowly from 13.34 g/kg to 32.89 g / kg G sample from 14.78 g/kg to 35.02 g / kg ~ (-1) T sample at 5.65 g / kg ~ (-1) ~ 22.87 g/kg. Soil total nitrogen content was 0.12 ~ 2.27 g 路kg ~ (-1) 路kg ~ (-1) and 0.13 ~ 1.64 g / kg ~ (-1) T sample was 0.88 ~ 0.84 g 路kg ~ (-1) 路kg ~ (-1); Available nitrogen content 23.94C 170.87 mg/kg,G plot 31.707 237.51 mg/kg,T plot 20.880.122.28 mg/kg; The range of total phosphorus variation was 2.30 ~ 2.66 g / kg 路kg ~ (-1) and 1.64 ~ 2.06 g / kg ~ (-1) ~ 1.63 ~ 2.18 g 路kg ~ (-1) 路kg ~ (-1); The available P S plots were abundant in 2007 and 2009, all of them were above 300 mg/kg, and the other plots were 36.23 ~ 154.29 mg / kg / kg ~ (-1) T plots, which were similar to those in S plots. The fluctuation range of available potassium G plot was 59.87 ~ 207.03 mg 路kg ~ (-1) 路kg ~ (-1). With the development of monitoring time, the comprehensive fertility index of various plots gradually decreased and tended to be stable, and the comprehensive fertility index of S sample land was 3.14 ~ 2.69 ~ G sample, 3.25 ~ 2.73T plot was 3.47 ~ 2.74 ~ (th). On the whole, the comprehensive fertility level of various plots showed a trend of first increasing and then stable, and the comprehensive grade of fertility was in the medium upward level.
【作者单位】：三峡大学土木与建筑学院;三峡地区地质灾害与生态环境湖北省协同创新中心;三峡大学水利与环境学院;
【基金】：国家“十二五”科技支撑项目(2012BAC06B02-04) 国家自然科学基金项目(51278281)
【分类号】：S158

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