Abstract:

Fixed ecological observation plots were established to study the effects of four vegetation patterns—〖WTBX〗Betula luminifera+H. compressa〖WTBZ〗(L.f), 〖WTBX〗Pleioblastus+H.compressa〖WTBZ〗(L.f), pure 〖WTBX〗H.compressa〖WTBZ〗(L.f) and 〖WTBX〗Bambusa pervariabilis×Dendrocala mopsis+H. compressa〖WTBZ〗(L.f)—on soil physical properties. The results showed that the percentage of soil sand and coarse silt of four vegetation restoration patterns declined at the layer 0~40 cm, reversed the trend of soil coarseness of the slope farmland to some degree; the soil physical clay granule content of the four vegetation restoration patterns at the layer 0~40 cm was higher than that of slope farmland, the ability of soil nutrient holding was strengthened to some degree, and 〖WTBX〗Pleioblastus+H. compressa〖WTBZ〗(L.f) exhibited the best effect at this aspect. Compared with the farmland, the soil bulk density of four vegetation restoration patterns was higher or lower at the layer 0~40 cm, and 〖WTBX〗Pleioblastus+H. compressa〖WTBZ〗(L.f) and 〖WTBX〗Bambusa pervariabilis×Dendrocala mopsis〖WTBZ〗 showed relatively better effect. Despite of 〖WTBX〗H. compressa〖WTBZ〗(L.f), the other three vegetation patterns showed better effects on soil porosity than farmland at the layer 0~40 cm, but in general the soil porosity was still low, especially the ratio between noncapillary porosity and capillary porosity, indicating that soil improvement was unable to be achieved in short time after cease farming and vegetation recovery. Vegetation restoration was just the first step. Only with long period of vegetation root system accumulation in the soil, underground creature amount increased and microorganism built up, can soil have a better structure in full range. Reasonable management and utilization of the vegetation is also important.〖

Key words: egetation restoration, soil physical property, soil improvement