论文部分内容阅读
为了解喀斯特地区退耕还林过程中不同植被恢复阶段的土壤理化性质特征,于研究区坡面的不同坡位设置样地:坡耕地(坡脚)、云南松人工林(下坡)、次生林(中坡)、石灰岩灌丛(上坡)。采用野外取样与室内分析相结合的方法对土壤理化性质进行了调查,并对其各项理化性质指标进行了皮尔逊(Pearson)相关性分析和主成分分析,最后,采用土壤水文结构功能模型评价滇东南普者黑峰林湖盆区次生林恢复植被的土壤水文结构功能。结果表明:研究区土壤孔隙度、毛管持水量状况大致为次生林>云南松林>石灰岩灌丛>坡耕地;云南松人工林和次生林有机质、全氮、全磷、全钾等元素均较高,p H较低。相关性分析表明,土壤含水率、有机质、全氮、全钾、交换性镁与土壤的其他理化性质有较强的相关性,是喀斯特地区保持土壤理化性质的主要因子。主成分分析表明,土壤总孔隙度、非毛管孔隙度、含水率、有机质、全磷、交换性镁、交换性钙、pH是土壤理化性质的关键因子,是养分循环和流动的载体。土壤水文结构功能指数的计算结果表明,次生林(0.68%)>云南松林(0.43%)>石灰岩灌丛(0.26%)。
In order to understand the characteristics of soil physical and chemical properties during different vegetation restoration stages in the process of returning farmland to forest in the karst area, the sampling plots were set up on different slope positions in the study area: slope farmland (Pinjia), Pinus yunnanensis plantation (downhill), secondary forest Mid-slope), limestone shrubs (uphill). The physical and chemical properties of soil were investigated by the combination of field sampling and indoor analysis. Pearson correlation analysis and principal component analysis were carried out for various indexes of physical and chemical properties. Finally, the functional model of soil hydrological structure Soil Hydrological Structure and Function of Restoring Vegetation in Secondary Forest of Montenegro Forest Region of. The results showed that the soil porosity and capillary water holding capacity in the study area were mainly secondary forest> Yunnan pine forest> limestone shrub> sloping farmland. The contents of organic matter, total nitrogen, total phosphorus and total potassium in Pinus yunnanensis plantation and secondary forest were higher than those in p H is low. Correlation analysis showed that soil moisture content, organic matter, total nitrogen, total potassium, exchangeable magnesium had strong correlation with other physicochemical properties of soil, which was the main factor to maintain soil physical and chemical properties in karst area. Principal component analysis showed that soil total porosity, non-capillary porosity, water content, organic matter, total phosphorus, exchangeable magnesium, exchangeable calcium and pH are the key factors of soil physical and chemical properties and are the carriers of nutrient circulation and flow. The calculation of soil hydrological structural function index showed that the secondary forest (0.68%)> Yunnan pine forest (0.43%)> limestone shrub (0.26%).