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在喀斯特生态重建示范区李果园、黄皮果园、火龙果园内设置样地,对其土壤中氮磷钾土壤养分含量和相关性分析研究,结果表明:果园中氮、磷、钾养分元素含量随着果树生长周期对营养吸收量不同而呈现季节性变化,土壤中氮磷钾含量空间垂直变化性变化明显,从土壤表层向下逐渐减少;在相关性方面,全氮和水解性氮相关性显著,全磷与有效磷相关性显著,全钾与有效钾不相关。9月示范区果园土壤氮的含量丰富,磷的含量处于相对平衡状态,而钾的含量严重不足。喀斯特石漠化区土层薄,水土保持能力差,养分不足、季节性差异大的环境特点制约了生态重建工作。根研究结果,建议在喀斯特石漠化区开展生态重建时,应对其土壤环境进行调查,针对不同立地类型实施土壤改良,选择适宜的物种栽植,遵循生态恢复规律,循序渐进地开展。
The results showed that the contents of nitrogen, phosphorus and potassium in the orchard increased with the increase of soil moisture content in the orchards The growth cycle of fruit trees showed a seasonal change in the amount of nutrient uptake, and the vertical variation of N, P and K contents in soil changed significantly from the soil surface downwards. In correlation, the correlation between total nitrogen and hydrolyzable nitrogen was significant , Total phosphorus and available phosphorus significant correlation, total potassium and available potassium is not related. In September, orchard soil nitrogen content is rich, phosphorus content in a relatively balanced state, while the serious shortage of potassium content. The karst rocky desertification area is characterized by thin soil layers, poor soil and water conservation capacity, inadequate nutrients and seasonal differences, which restrict the ecological reconstruction. According to the research results, it is suggested that in the process of ecological reconstruction in the karst rocky desertification area, the soil environment should be investigated, the soil improvement should be carried out for different types of sites, the suitable species should be planted, and the law of ecological restoration should be followed.