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在广东省英德市九龙镇峰林平原选择峰林坡麓灌丛、积水洼地、砂糖橘林、竹林、菜地、稻田6种不同土地利用类型,采集不同土地利用方式下不同深度的土壤,利用原子吸收分光光度计测定了土壤全钙、交换态钙和水溶性钙质量分数,结果表明:1)菜地、稻田、砂糖橘林和竹林土壤厚度显著大于自然坡麓和积水洼地;2)岩溶积水环境中(积水洼地和稻田)土壤全钙质量分数平均超过59 g/kg;其次为坡麓土壤,平均为20.83 g/kg;人工耕作的砂糖橘林和菜地土壤全钙质量分数分别降低至3.51和2.76 g/kg,而相邻的非岩溶区土壤的全钙质量分数仅为1.43 g/kg;3)耕地施肥会增加土壤的交换态钙和水溶性钙质量分数,菜地和砂糖橘林土壤交换态钙离子、水溶性钙占全钙的比例分别为38.04%、23.08%和1.41%、0.88%,而积水洼地和坡麓灌丛只有7.86%、6.87%和0.25%、0.46%。由于菜地和砂糖橘林的全钙质量分数降低,而交换态钙和水溶性钙质量分数增加会进一步加剧钙元素流失;4)不同土地利用类型土壤全钙、交换态钙和水溶性钙质量分数随深度变化呈波状下降趋势,积水洼地与稻田钙随深度的变化远比菜地、砂糖橘林和竹林剧烈;5)土壤厚度、岩石裸露率、坡度相互呈显著负相关,土壤全钙、交换态钙、水溶性钙之间均呈显著正相关,岩石裸露率与交换态钙呈显著负相关,水、土壤厚度、岩石裸露率与坡度共同决定了土壤钙的分布和迁移。
In the Fenglin plain of Jiulong town in Yingde City, Guangdong Province, six types of land use types, including the shrubbery, water puddle, orange grove, bamboo forest, vegetable field and paddy field, were selected to collect soil with different depths under different land use patterns , The content of total calcium, exchangeable calcium and water-soluble calcium in soils were determined by atomic absorption spectrophotometer. The results showed that: 1) The thickness of soils in vegetable fields, paddy fields, orange groves and bamboo forests was significantly larger than that in natural slopes and stagnant water depressions; 2) The soil total calcium content in the karst environment (waterlogged depressions and paddy fields) averaged more than 59 g / kg, followed by the slope soil, with an average of 20.83 g / kg. The content of calcium decreased to 3.51 and 2.76 g / kg, respectively, while that of adjacent non-karst soil was only 1.43 g / kg. 3) Cultivated land fertilization could increase the exchangeable calcium and water-soluble calcium content , And the ratios of exchangeable calcium ions and water-soluble calcium to total calcium in vegetable field and sugar cinnamon soil were 38.04%, 23.08% and 1.41%, 0.88% respectively, while those in waterlogged depression and slopeland were only 7.86% and 6.87% And 0.25%, 0.46%. Due to the decrease of total calcium content in vegetable field and coniferous orange plantation, the increase of exchangeable calcium and water-soluble calcium will further aggravate the loss of calcium; 4) The contents of total calcium, exchangeable calcium and water-soluble calcium in different land use types The scores of watered-out depression and watered-down rice showed a trend of wavy declining with the depth, and the variation of depth with the change of depth was more significant than the depth of vegetable field, citrus groats and bamboo forest. 5) The soil thickness, rock bareness and slope were negatively correlated with each other, , Exchangeable calcium, water-soluble calcium were significantly positive correlation between rock bare and exchangeable calcium showed a significant negative correlation, water, soil thickness, rock bareness and slope together determine the distribution and migration of soil calcium.