Adopting field investigation and indoor analysis

the changes of soil water-stable aggregates distribution and the driving forces in the conversion of paddy field to tea garden were examined. The results showed that soil water-stable aggregate in the paddy field and tea garden was different among different size class and soil layer. With the decrease of the particle size

the water-stable aggregate firstly decreased and then increased in paddy soil and tea plantation with 5 years

10 years. In the 15 years tea garden

water-stable aggregate was increased with the decrease of the particle size. With the increasing years of tea planation

water-stable aggregate was given priority to ＞2 mm turn into ＜0.25 mm both in 0—20 cm and 20—40 cm soil layer

while ＜0.25 mm water-stable aggregate was the predominant contributor in 40—60 cm soil layer. The water stability of soil aggregate decreased with the increasing years both in 0—20 cm and 20—40 cm soil layer

whereas the ranking from high to low in 40—60 cm soil layer was: tea plantation 5 years＞tea plantation 10 years＞paddy field＞tea plantation 15 years. The stability water of soil aggregate was positively correlated with the content of ＞0.25 mm water-stable aggregate. The water stability of soil aggregates was positively correlated with the soil chemical properties

and the main driving factors were ＞0.25 mm aggregates

soil bulk density and total porosity. In terms of nutrients

the driving forces of water stability in paddy field

tea garden 5 years

10 years and 15 years were organic matter

organic matter and CEC

organic matter

CEC and effective phosphorus content

content of CEC

respectively.