| 【Objective】The study was conducted to explore the effect of terracing in low mountain sloping land
on the distribution characteristics and availability of soil phosphorus in northern Guangdong.【Method】The forest land
（FL）, dry land terrace（UT）and paddy terrace（PT）soils developed from granite in this area were selected as research
objects, and the physicochemical properties, phosphorus content and availability of different soil layers in the soil profile
were determined.【Result】Compared with FL, available phosphorus and phosphorus activation coefficient（PAC）of UT
and PT 0-20cm soil increased significantly, and PT soil had the highest value. Soil organic phosphorus（OP）and inorganic
phosphorus（IP）of three land uses in the profile showed a C-shape trend, and those of topsoil were the highest. Compared
with FL, UT and PT soils were dominated by IP, and Fe-P and O-P accounted for higher proportion. The proportion of O-P increased from 7.69%-13.58% to 22.97%-41.96%. The results of path analysis and redundancy analysis showed that OP was
sensitive phosphorus for the availability of soil phosphorus in this area, and free iron and organic carbon were the key factors
to drive the conversion of soil phosphorus components.【Conclusion】The terracing in low mountain sloping land in northern
Guangdong changed the distribution pattern of phosphorus in the soil profile and increased the availability of phosphorus and
the proportion of soil ineffective phosphorus. |
