喀斯特高原峡谷石漠化治理过程中土壤理化性质的变化

发布时间：2019-01-18 18:47

【摘要】：采用时序研究法,对2006—2013年喀斯特高原峡谷石漠化治理过程中5种石漠化阶段的土壤理化性质进行动态监测,研究土壤理化性质的时空演变规律,为石漠化的进一步治理提供科学依据。结果表明:随着治理时间增加,土壤理化性质整体上得到改善,主要体现在土壤毛管孔隙度、总孔隙度、田间-毛管持水量、渗透速率、pH值、全K、速效K及全P含量增加;随着时间增加,土壤理化性质表现出前期(2006—2010年)平稳、波动甚至恶化,后期(2010—2013年)大幅改善的非线性变化特点,说明一方面土壤质量对植物群落结构优化和小气候改善的响应存在滞后效应,另一方面也受到2009—2010年西南大旱的影响;空间尺度上,无石漠化环境土壤理化性质表现最好,其余4种石漠化阶段之间的理化性质多年均值差异不明显,说明经过长期治理,不同石漠化阶段之间的土壤理化性质差异缩小,同时"空间指示时间"手段在此并不适用;潜在-轻度石漠化环境部分土壤理化指标表现不佳,应成为今后石漠化防治的工作重点。
[Abstract]:Dynamic monitoring of soil physical and chemical properties in five stages of rocky desertification in karst plateau canyons from 2006 to 2013 was carried out by using time series research method, and the temporal and spatial evolution law of soil physical and chemical properties was studied. To provide scientific basis for further control of rocky desertification. The results showed that the physical and chemical properties of soil improved as a whole with the increase of treatment time, mainly reflected in the increase of soil capillary porosity, total porosity, field-capillary water holding capacity, permeability rate, pH value, total K, available K and total P content. With the increase of time, the physical and chemical properties of soil showed the characteristics of stable, fluctuation and even deterioration in the previous period (2006-2010), and significant improvement in the later period (2010-2013). On the one hand, the response of soil quality to plant community structure optimization and microclimate improvement has lag effect, on the other hand, it is also affected by the severe drought in the southwest of China from 2009 to 2010. On the spatial scale, the physical and chemical properties of the soil in the environment without rocky desertification are the best, and the differences of the physical and chemical properties among the other four stages of rocky desertification are not obvious, which indicates that the physical and chemical properties of the soil have been controlled for a long time. The difference of soil physical and chemical properties between different stages of rocky desertification was reduced, and the method of "space indicating time" was not applicable. The physical and chemical indexes of some soil in the environment of latent and mild rocky desertification are not good, which should be the focus of the control of rocky desertification in the future.
【作者单位】：中国科学院地球化学研究所环境地球化学国家重点实验室;中国科学院大学;贵州师范大学地理与环境科学学院;天津大学表层地球系统科学研究院;
【基金】：贵州省社会发展科技攻关计划项目(黔科合SY字[2012]3011号) 国家重大科学研究计划项目(2013CB956703)资助
【分类号】：S153

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