| 丹江口库区入库河口土壤养分空间变异研究——以青塘河河口为例 |
| Spatial Variation of Soil Nutrients in the Estuary Area of Danjiangkou Reservoir Region:Qingtang River Estuary Case Study |
| 投稿时间：2015-09-18 修订日期：2016-04-12 |
| DOI：10. 15928/j.1674-3075.2016.03.002 |
| 中文关键词:丹江口水库 土壤养分 空间变异 地统计学方法 |
| 英文关键词:Danjiangkou Reservoir soil nutrients spatial variability geostatistical analysis |
| 基金项目:国家科技支撑计划课题（2012BAC06B03） |
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| 中文摘要: |
| 通过探究河口土壤养分状况及空间变化规律，为入库河口生态修复提供理论依据，以丹江口水库青塘河入库河口为例，采用传统描述性统计和地统计分析法对入库河口表层土壤养分空间变异特征进行了研究。结果表明，土壤各养分指标变异系数为38.6%~97.9%，除速效磷外，总体属中等强度变异。研究区土壤各养分指标均具有中等程度的空间自相关性，自相关距离为272～2110 m，由大到小依次为：速效磷>碱解氮>有机质>速效钾。研究区土壤有机质含量为7.97～45.03 g/kg，处于中等偏上水平，碱解氮含量为42.97～178.70 mg/kg，处于中等偏下水平，速效磷含量为5.03～121.40 mg/kg，速效钾含量为62.50～820.65 mg/kg，分别达到丰富和极丰富水平。受土壤母质、地形、气候等非人为因素和施肥、作物、管理水平等人为因素影响，研究区有机质、速效磷和碱解氮均呈现出由东南向西向北方向逐渐递减的趋势，速效钾在中部偏东处含量最高。与传统统计方法相比，地统计分析能较好地反映土壤养分含量的结构性、随机性、独立性和相关性。研究结果可为丹江口水库青塘河入库河口植被恢复与生态修复提供理论依据。 |
| 英文摘要: |
| Estuaries provide the last protection against discharge of exogenous pollution into reservoirs and well vegetated estuary buffers effectively reduce exogenous pollutants. Increasing the height of the Danjiangkou Reservoir dam will inundate a portion of the estuaries and vegetation will be adversely affected. The biomass and productivity of vegetation is dependent on nutrients, so it is important to investigate the spatial distribution of soil nutrients in the estuaries before the additional impoundment to support restoration of the vegetation. For this purpose, a case study of the spatial variation of topsoil nutrients in the Qingtang River estuary area of Danjiangkou Reservoir was carried out using traditional descriptive statistics and geostatistical analysis. The study site selected was the newly inundated area created by dam heightening, with an area of 0.378 km2 and an elevation of 147-175m. Thirty-one soil samples (0-20cm) were collected in six sampling strips running vertically to the river banks and with different soil uses. Soil samples were analyzed for pH, organic matter (OM) and the available nitrogen, phosphorous and potassium. The variation coefficient of soil nutrients ranged from 22.9% to 97.9%, displaying moderate variabilty except for available P. Soil nutrients also displayed moderate spatial autocorrelation in the study area with a spatial autocorrelation distance ranging from 272 m to 2110 m and following the order, available P > available N > OM > available K. Mean values for OM ranged from 7.97 g/kg to 45.03 g/kg, higher than typical values, while mean values for available N ranged from 42.97 mg/kg to 178.70 mg/kg, below average levels. The mean values of available P ranged from 5.03 mg/kg to 121.40 mg/kg, and available K ranged from 62.50 mg/kg to 820.65 mg/kg, both at abundant levels. The OM, available P and available N displayed similar spatial distributions, decreasing gradually from southeast to west and north and maximum available K was observed in the east-central part of the study area. Compared with traditional descriptive statistics, the geostatistical analysis well reflected the constitutive properties, randomness, independence and correlation of soil nutrients. These results will support revegetation and ecological restoration in the Qingtang River estuary area of Danjiangkou Reservoir. |
| 雷俊山,尹 炜.2016.丹江口库区入库河口土壤养分空间变异研究——以青塘河河口为例[J].水生态学杂志,37(3):13-18. |
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