施肥对马尾松土壤磷形态的影响

采用室内盆栽试验研究了不同施肥处理下马尾松土壤磷形态,结果表明:施入P肥后土壤中无机磷的含量产生了变化,施入PK后根际土和非根际土土壤中的速效磷含量都有增加;除施入K、PK外,施肥后根际土和非根际土中Al-P的含量都比未施肥的高;施肥后Fe-P的变化比较大,而Fe-P的减少是由于南方土壤中的铁大多是以高价存在,易发生氧化还原反应;O-P是一种无效磷,施肥后土壤中的O-P含量均沉积于土壤而比对照的高;施入N、P、K、PK、NK、NPK后降低了两种土壤中Ca-P的含量。因此,为了促进马尾松的生长发育,可以给马尾松增施NP、PK、NPK肥。

Effect on Soil Phosphorus Change of Masson Pine after Fertilizer Treatments

The research is to study the soil phosphoric form changes by planting masson pines in pot after fertilization, the results indicate that soil inorganic phosphate content changed after fertilized P. Soil inorganic phosphorus were obviously higher in non - rhizosphere than in rhizosphere, and available P contents increased in the rhizosphere and non - rhizosphere after fertilization of PK. Meanwhile, Al - P was much higher in fertilized treatments than in CK except K and PK treatment. The change of Fe - P was large for Fe was easily happening oxidation reduction in southern China. O -P is an invalid P, its contents were higher than CK. Ca -P was reduced after the fertilization of N ,P,K,PK ,NK, NPK. Therefore, the use of NP, PK, NPK could be increased to promote masson pine＇s growth.