喀斯特高原峡谷区不同恢复模式的土壤生态效应
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S157.1

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贵州省重大专项(黔科合JZ字[2014]200211);贵州省科技计划项目(黔科合SY字[2013]3165号);黔科合重大专项([2016]3022号)


Soil Ecological Effects of Different Restoration Models in the Karst Plateau Gorge Region
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    摘要:

    通过野外调查和室内试验分析,以荒草地作为对照,选取贵州省西南部喀斯特高原花江峡谷地区6种不同的生态恢复模式作为研究对象,对其林下土壤的理化性质、抗侵蚀特征、渗透性能以及其与土壤养分之间的关系进行分析,探讨该地区不同恢复模式对土壤产生的生态效应及作用过程。结果表明:(1)相较于荒草地,不同恢复模式对土壤容重、总孔隙度等物理特性指标和抗冲性系数、抗蚀性指数均有显著的改善作用(p<0.05)。其中,不同恢复模式总孔隙度与非毛管孔隙度分别较荒草地提高了2.62%,6.45%;土壤紧实度、容重分别较荒草地降低了19.95%,3.98%,趋于稳定的不同恢复模式抗冲性系数均值为荒草地的1.79倍,流失的干土重均值仅为荒草地的45.42%;不同恢复模式趋于稳定的抗蚀指数均值较荒草地高27.53%。(2)不同恢复模式土壤初渗率(2 min)、稳渗率、平均渗率、渗透总量4个指标的均值依次为荒草地的1.6倍,1.0倍,1.2倍和1.3倍;土壤渗透性能的主成分综合评价模型Z=0.9689×F1结果表明不同恢复模式渗透性平均得分(0.186 0)比荒草地(-1.115 8)高,这反映出不同恢复模式渗透性能较好。(3)土壤养分中碱解氮、速效磷、速效钾、有机质与渗透总量、抗冲性系数和抗蚀性指数普遍存在极显著的相关关系(p<0.01),土壤抗侵蚀特性和渗透能力与土壤养分关系紧密。综上所述,不同恢复模式对该地区的林下土壤物理性质、土壤抗侵蚀特性和渗透能力有显著的改善作用,而这些生态功能的改善对土壤养分的赋存和流失具有很大关联。

    Abstract:

    To study the soil ecological effects of different restoration models in the karst gorge of the Karst Plateau, six typical ecological restoration models were selected as the research objects to analyze the soil physical-chemical properties, anti-erosion characteristics, infiltration properties, and the relationship between soil nutrients and the above-mentioned properties, taking an abandoned grassland as the control. Field survey, sample collection, and lab analysis were carried out. The results indicated that: (1) Compared with the abandoned grassland, the restoration models significantly improved soil physical properties such as bulk density, and total porosity, as well as anti-scouribility coefficient and anti-erodibility index (p < 0.05). Total porosity and non-capillary porosity was increased by 2.62% and 6.45% by different restoration models, respectively. Soil compactness and bulk density was decreased by 19.95% and 3.98%, respectively. The mean value of anti-scouribility coefficient of different restoration models was 1.79 times of that of the abandoned grassland, the average dry soil loss was only 45.42% of that of the abandoned grassland, and the average value of anti-erodibility index was 27.53% higher than that of the abandoned grassland. (2) Infiltration experiments showed that the average initial infiltration rate (2 min), stable infiltration rate, average infiltration rate, and total infiltration of the six restoration models was 1.6, 1.0, 1.2, and 1.3 times of that of the abandoned grassland, respectively. Comprehensive evaluation model of soil permeability based on principal component analysis (Z = 0.9689 × F1) showed that the average soil permeability score of the restoration models (0.1860) was higher than that of the abandoned grassland (-1.115 8), indicating that the permeability of the ecological restoration models was stronger than that of the abandoned grassland. (3) Correlation analysis showed that there was a highly significant correlation (p < 0.01) between available nitrogen, available phosphorus, available potassium, organic matter and total infiltration, the anti-scouribility coefficient, anti-erodibility index, respectively. Soil anti-erosion characteristics and infiltration ability had important effects on soil nutrients. In conclusion, compared with the abandoned grassland, the restoration models significantly improved soil physical properties, anti-erosion characteristics, and infiltration properties, which had a great connection with the occurrence and loss of soil nutrient.

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鲍 乾, 杨 瑞, 李万红, 聂朝俊, 陆发俊.喀斯特高原峡谷区不同恢复模式的土壤生态效应[J].水土保持学报,2017,(3):154~161

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  • 在线发布日期: 2017-09-04
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