Abstract: P nutrient management and specific ecological conditions of solar greenhouse influence P cycling and?utilization. The objects of this research is to explore changes of calcareous soil P stocks and inorganic P fractions in?solar greenhouse with planting term in Shanxi，which will guide for P use efficiency improvement and diminishing?negative impacts to environment. The results demonstrated that the contents of soil total P，inorganic P，Olsen-P and?fractions of inorganic P(including Ca₂-P，Ca₈-P，Ca₁₀-P，Al-P，Fe-P)significantly increased with continuous planting?term. Whereas correlation coefficient(r)of Olsen-P with planting term was lower than those of soil total P and inorganic P. The influence of cultivating term on Ca₁₀-P was the lowest among the inorganic P fractions. Planting term?had no any effect on the percentage of inorganic P in soil total P. The percentages of Ca₂-P，Ca₈-P，Ca₁₀-P，Fe-P?and Al-P of inorganic P were 3. 4%，23. 9%，67. 2%，3. 3% and 2. 0% respectively，in soil which crops were?grown. When the land was converted to solar greenhouse for vegetable production，ratio of Ca₂-P in inorganic P increased to 8% －9% during the first two planting years and then kept stable. Meanwhile ratio of Ca₈-P in inorganic?P researched to 50% when the soil was used as solar greenhouse for 4 －5 years. Afterwards the ratios of inorganic P?fractions were not influenced by planting term.

Key words: Soil P stocks, Inorganic P fractions, Solar greenhouse, Planting term

CLC Number: 

• S158