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在对辽宁省主要保护地蔬菜生产区生产状况进行实地调查的基础上,自蔬菜保护地和与之相邻的露地大田采集土壤样品,研究保护地土壤有机质含量变化特点,分析了改作保护地后种植年限、有机肥施用量等因素对保护地土壤有机质含量的影响。结果表明:(1)蔬菜保护地土壤有机质含量总体上已经显著高于露地大田土壤,且这一差异0~20 cm土层明显大于20~40 cm土层;(2)保护地土壤有机质含量表现出随着改作保护地后种植年限延长而增加的变化趋势;(3)在改作保护地后种植年限相近的条件下,保护地土壤有机质含量及其增量与有机肥施用量呈明显的正相关关系。(4)辽宁各地保护地土壤有机质含量差异明显,其中大连地区保护地土壤有机质含量较高,其他地区处于中-低水平,需要增加投入、提高土壤有机质含量以进一步培肥地力。
Based on the field investigation of production status of vegetable production areas in main protected areas of Liaoning Province, soil samples were collected from vegetable conservatories and adjacent fields to study the changes of soil organic matter content in protected areas. Planting years, the amount of organic manure and other factors on soil organic matter content in protected areas. The results showed that: (1) The content of soil organic matter in vegetable soils was significantly higher than that in open field soils, and the difference was significantly greater in 0 ~ 20 cm soil layer than in 20 ~ 40 cm soil layer. (2) The content of soil organic matter (3) Under the conditions of similar planting years after changing to protected area, the content of organic matter in soil and the increment of organic matter in the protected area showed a significant positive correlation with the application rate of organic manure relationship. (4) The contents of soil organic matter in protected areas of Liaoning Province were significantly different. Among them, the content of organic matter in the protected areas in Dalian was relatively high and the other areas were in the middle-low level, and the inputs needed to be increased to increase the soil organic matter content to further fertilize the soil.