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The Soil Physical and Chemical Properties and Soil Water Chemical Components of Three Forest Stands in Kuandaushi Forest Ecosystem
|關鍵字:||soil physical and chemical properties;土壤理化性質;soil water chemical components;土壤水化學成分||出版社:||森林學系||摘要:||
Kuandaushi forest ecosystem is a typical forest in
central Taiwan. In this forest ecosystem, it includes
plantation stand(Cunninghamia lanceolata), secondary hardwood
stand, and natural hardwood stand in the same watershed.
Exploring the property variance and difference of the soil and
the water in soil in various stands are the purpose of this
study. Further more, it can be found the differences caused by
various of soil and by seasonal variation. Three repeat
sampling areas were established
in these three various stands, respectively. Soil were sampled
from deepths of 0-5cm, 15-20cm, 30-35cm, and 60-65cm, and the
physical and chemical property were determined. Sampling
equipments of tension lysimeter and zero-tension lysimeter were
also estabilshed in every sampling area by the soil deepth of
15-20cm, 30-35cm, and 60-65cm. Three repeat sampling areas were
established in these three various stands, respectively. Water
collected from tension lysimeter was harvested every two weeks,
zero-tension lysimeter water was taken every one month.
Conductivity, pH, HCO- , kj-N, and NH4+, NO3-, SO42-, Ca2+,
Mg2+, K+, Na+, F-, Cl- was determined of each water sampling.
The texture of soil of plantation stand, secondary hardwood
stand and natural hardwood stand belongs to heavy clay texture,
light loam texture and light loam texture, respectively. The
higher ion concentrations can be found in soil of natural
hardwood stand than in secondary hardwood stand and in
plantation stand. The cation exchange capacity of natural
hardwood stand is more intensity than the other two stands. The
ion concentrations are lesser and lesser followed by deepth of
soil. Soil pH is lower
in plantation stand than in secondary hardwood stand and natural stand.
Waters collected from tension lysimeter are higher conductivity
and ion concentration than collected from zero-tension
lysimeter. It can be found a trend that the soil water have
less nutrients in deeper soil, but pH value is higher. There is
a phenomenon that anion and cation equivalent concentrations of
soil water will increase in dry season and reduce in wet season.
|Appears in Collections:||森林學系|
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