近自然化改造对马尾松人工林土壤团聚体有机磷组分含量变化的影响

Organic phosphorus (Po) is an important part of soil phosphorus reservoir. In order to investigate the effects of the soil Po fraction distribution properties in Pinus massoniana plantations after close to nature silviculture, we investigated the pure P. massoniana plantations (PP) and P. massoniana broad leaved mixed plantations (CP) after close to nature silviculture in southern subtropical China. After collecting 0~10 cm soil sample, it was screened into >2 mm, 0.25~2 mm and MRO P>MLO P>LO P, while CP was HROP>MLO P>MRO P>LO P. (3) The MBP and ACP activity in CP was markedly greater than that of PP in the bulk soil and the soil aggregates, and there was a tendency for the ACP activity to increase with the decrease in the size of the aggregates. (4) Redundancy analysis revealed that soil available phosphorus (AP), mean weight diameter (MWD), MBP and total nitrogen (TN) were the main drivers of the soil Po fraction. In conclusion, the close to natural forest management model is beneficial to the accumulation and transformation of soil phosphorus in P. massoniana plantation. This study provides a theoretical basis for the improvement of soil quality and productivity in P. massoniana plantations.