黄土丘陵区不同生长年限刺槐林土壤无机磷的变化规律

利用时空互代法,在野外调查和室内分析的基础上,探讨了生长2、16、24、27、30和43 a(恢复年限)刺槐林土壤无机磷的变化规律。结果表明:随年限延长,刺槐林地土壤全磷和无机磷含量呈减少之趋势,除Ca10-P表现为明显的下降趋势外,其他无机磷组分均随恢复年限的延长呈总体增加趋势;不同恢复年限内,刺槐林地土壤无机磷组分含量和比例有如下顺序:Ca10-P>Ca8-P>Fe-P>Al-P>Ca2-P。

Changes of inorganic phosphorus in the soils covered with Robinia Pseudoacacia with different growing period of in the loess hilly area

The time-space substitute method was used to discuss the changes of inorganic phosphorous in the woodlands covered with Robinia pseudoacacia of 2,16,24,27,30 and 43 years of growing period respectively on the basis of field investigation and laboratory analysis.The results indicate that with the extension of growing period,both the contents of total amount of total-phosphorous and inorganic phosphorous in the woodland covered with Robinia pseudoacacia decreased,and the content of Ca10-P showed significant decrease,on the contrary,other inorganic phosphorus fraction increased;while in the soils that covered with Robinia pseudoacacia of different growing period,the content and proportion of inorganic phosphorous fraction maintained following order as: Ca10-P>Ca8-P>Fe-P>Al-P>Ca2-P.