【摘要】 本文叙述了滇南热带地区森林开垦后不同利用状况下土壤肥力演变的研究结果。垦后植胶15年来,胶园土壤的各种理化性状仍接近森林土壤,肥力相对稳定,垦后种农作物6年的农地土壤,其肥力明显变劣,如土壤容重增大,孔隙度降低,结构变差,水分含量下降,温度变幅增大,酸度增加,有机质和氮磷等养分含量大幅度下降,肥力显著降低。根据上述结果,提出了合理利用滇南热带区土地资源的初步意见。更多还原

【Abstract】 This paper presents the results of our study on the variations in soil fertilities of the reclaimed rain forest under different crops in southern Yunnan Province. It has been proved that the soil fertilities of such land placed under rubber remain relatively stable for 15 years with chemical and physical properties of the soil nearly unchanged, while those of such land under cereal crops tend to deteriorate significantly in 6 years time. This is demonstrated by the increase in soil volume weight, the reduction in soil porosity, moisture content and pH value, fluctuation in soil temperature and sharp decrease in organic matter and N、P contents.According to the results obtained, a suggestion is made for rational use of the tropical land resources in southern Yunnan Province.更多还原