Kajian ini tumpu kepada aspek perbezaan permukaan sifat kimia tanah di kawasan
Seberang Perai, Malaysia dengan menggunakan kaedah “Geostatistical”. Maklumat yang
tepat daripada kajian dalam aspek perbezaaan dalam sifat kimia tanah di iklim tropika
adalah penting kerana ia akan membantu membuat penyiasatan dalam ciri-ciri saliran dan
permodelan reaksi tanah dan hidrologi di kawasan sekitar Seberang Perai di Malaysia.
Dua kesan yang ketara bagi aspek perbezaan permukaan telah dikaji dalam kajian ini.
Pertama, corak taburan sifat-sifat kimia tanah seperti pH, kandungan Nitrogen (N),
kandungan Phosphorus (P) dan kandungan Potassium (K) dalam tanah telah dikaji dan
kedua hubungkaitan antara sifat-sifat ini dikaji. Kawasan kajian ini dibahagikan kepada
beberapa nombor rujukan grid-geo (n=70). Sampel tanah kemudian diambil pada titik ini
dan dikaji dimakmal untuk menentukan sifat kimianya. Sifat tanah ini dengan rujukan
lokasi grid-geo dianalisis untuk membuat peta sifat kejuruteraan pada kawasan kajian
dengan menggunakan perisian SURFER. Kemudian analisis semivariogram dibuat untuk
sifat kejuruteraan dengan menggunakan perisisin GS+ untuk menkaji hubungkait antara
set-set data. Keputusan menunjukan bahawa terdapat perbezaan yang ketara didalam sifat
kimia tanah di sekitar kawasan kajian. Nisbah “nugget to sill“ daripada analisa GS+
menunjukan bahawa pH dan kandungan fosforus bersifat separa bebas. Manakala
kandungan Pottasium dan jumlah Nitrogen bersifat bebas.
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This study addressed the characterization of spatial variability of soil nutrients at
Seberang Perai, Malaysia using Geostatistical methods. Accurate information from this
study on the spatial variability of soil chemical properties is very important in
understanding and characterization of small scale spatial variability nature of nutrient
properties of tropical soil, and thus allows in investigation of the catchment’s
characteristics in Seberang Perai area in Malaysia. Two significant aspects of spatial
variability of soil chemical properties were examined in this study. First, spatial
distribution patterns of soil chemical properties (pH, total Nitrogen (N), available
Phosphorus (P) and exchangeable Potassium (K)) were investigated and secondly the
spatial autocorrelation for these properties were investigated. The study area was divided
by a number of geo-grid reference points. Soil samples (n=70) were collected at these
points and were analyzed in the laboratory for soil chemical soil properties. Differential
global positioning system (DGPS) was used to locate the sample position. These soil
properties along with their geo-grid reference location were analyzed to produce soil
properties map over the entire area using the software SURFER. Semivariogram analysis
was performed for the spatial soil properties to examine the autocorrelation among the
data set using GS+ software. Results indicate that significant spatial variability exist in
the soil chemical properties. The nugget to sill ratio indicates a moderate dependency for
soil pH and available Phosphorus, while a strong dependency for Potassium and total
Nitrogen.
Characterization of spatial variability of soil nutrients at Seberang Perai, Malaysia / Lai Kong Soon