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In Qinjiagou watershed of Three-Gorge of
Yangtze River, 18 indices were selected from canopy layer, litter layer, soil
layer and topography to evaluate the soil and water conservation capacities of
four common plantation types by ideal point method. Results indicated that the
broadleaf plantation of robur (Lithocrpus glabra) and Chinese gugertree (Schima
superba) (LS) has the biggest soil and water conservation capacity. The rank of
three other plantation types from big to small is the mixed broadleaf
plantation of sweetgum (Liguidambar formosana), Chinese gugertree and camphor
tree (Cinnamomum camphora) (LSC), the mixed broadleaf-conifer plantation of
Chinese fir (Cunninghamia lanceolata), Masson pine (Pinus massoniana) and Chinese
gugertree (CPS), and the mixed Pine plantation of Chinese fir and Masson pine (CP).
Under the same climate and topographical condition, the broadleaf plantation
has better soil and water conservation capacity than the conifer plantation.
Sensitivity analysis showed that the three most sensitive indices are soil
non-capillary porosity, soil aggregation, and soil initial infiltration rate.
The litter amount and soil properties are the most important indicators of soil
and water conservation capacity of plantations. Therefore, suitable
measurements such as deep tillage should be taken to improve the properties of
soil under different plantations.
Polynomial splines have played an important
role in image processing, medical imaging and wavelet theory. Exponential
splines which are of more general concept have been recently investigated.We
focus on cardinal exponential splines and develop a method to implement the exponential
B-splines which form a Riesz basis of the space of cardinal exponential splines
with finite energy.