Soil phosphorus fractions and their availability over natural succession from clear-cut of a mixed broadleaved and Korean pine forest in northeast China  

作　　者：Peng Yu Xin Zhang Huiyan Gu Jianping Pan Xiangwei Chen 

机构地区：[1]Northeast Forestry University,Harbin 150040,People’s Republic of China [2]Academy of Forest and Grassland Inventory and Planning,National Forestry and Grassland Administration,Beijing 100714,People’s Republic of China

出　　处：《Journal of Forestry Research》2022年第1期253-260,共8页林业研究（英文版）

基　　金：supported by the National Forestry Industry Public Welfare Projects(grant number 201404202)。

摘　　要：To assess phosphorus(P)status of forest soil under naturally restored vegetation,P fractions in the 10-cm soil layer were quantified at different successional stages on the clear-cut site of mixed broadleaved and Korean pine forest.Four communities of shrub,softwood broad-leaved forest,softwood and hardwood broad-leaved forest,and hardwood broad-leaved forest represented different successional stages.A soil sample from a primary broad-leaved and Korean pine stand was the control.A sequential P fractionation scheme extracted empirically defined pools of P and path analysis used to partition the direct and indirect contribution of soil P fractions to available P.The results show that available P increased significantly with long-term succession,while both sodium bicarbonate-extractable P(NaHCO_(3)-P)and sodium hydroxide-extractable P(NaOHP)fractions were reduced in early successional stages and increased in late stages.Compared to the primary forest,concentrations of P fractions in the four stages significantly decreased except for HCl-P,indicating that soil P supplements over the long-term did not return to primary forest levels.The results of related analysis also showed that NaHCO_(3)-P_(i)levels were significantly related to available phosphorus.According to the path analysis coefficient,NaHCO_(3)-P_(i)exhibited the highest effect on available P among eight P fractions;the indirect effects of other P fractions via NaHCO_(3)-P_(i)were larger than those with other P fractions.Overall,this study suggests that soil P bioavailability gradually improved during natural vegetation restoration on clear-cut sites mainly through the increase of NaHCO_(3)-P,where phosphorous is immediately available,and subsequently available phosphorus Na OH-P.

关 键 词：Vegetation succession Available phosphorus Phosphorus fractions Correlation analysis Path analysis 

分 类 号：S714[农业科学—林学]