| Spatial heterogeneity of surface soil nutrients in Minqin lake area |
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| DOI：10.7606/j.issn.1000-7601.2013.01.24 |
| Key Words: surface soil nutrient spatial heterogeneity geostat
istics Minqin lake area |
| Author Name | Affiliation | | ZHANG Kai | Institute of Arid Meteorology, China Meteorological Administration / Key Laboratory of Arid Climatic Changing and
Reducing Disaster of Gansu Province / Key Open Laboratory of Arid Climate Change
and Disaster Reduction of CMA, Lanzhou 730020, China
Cold and Arid Region Environmental and Engineering Research Institute, Chines
e Academy of Sciences, Lanzhou 730000, China | | FENG Qi | Cold and Arid Region Environmental and Engineering Research Institute, Chines
e Academy of Sciences, Lanzhou 730000, China | | LU Yongqing | Department of Geographic and Environmental Science, Northwest Normal Universi
ty, Lanzhou 730070, China | | ZHANG Bo | Department of Geographic and Environmental Science, Northwest Normal Universi
ty, Lanzhou 730070, China | | SI Jianhua | Cold and Arid Region Environmental and Engineering Research Institute, Chines
e Academy of Sciences, Lanzhou 730000, China | | WANG Runyuan | Institute of Arid Meteorology, China Meteorological Administration / Key Laboratory of Arid Climatic Changing and
Reducing Disaster of Gansu Province / Key Open Laboratory of Arid Climate Change
and Disaster Reduction of CMA, Lanzhou 730020, China |
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| Abstract: |
| By using the methods of geostatistics, the spatial
heterogeneity of available N, available P and available K in surface soils in M
inqin lake area was studied. The results indicated that soil N and K were rich b
ut soil P was poor over the three landscapes of oasis, desert and transitional b
elt. The variation coefficient of soil available N and P was the smallest in oas
is area and the biggest in desert area, while that of soil available K was the s
mallest in desert area and the biggest in oasis desert transitional belt. Soil
nutrients in the study area wholly exhibited moderate spatial variability. The s
oil available N and P presented a U shaped distribution pattern, and the soil
available K presented an inverse U shaped distribution pattern from oasis to de
sert. Available N, P and K fitted well to Exponential model, PentaspHerical mode
l and Tetrasherical model, respectively. The enriched zone of available N and P
was located in oasis area, whereas that of available K was located in oasis-dese
rt transitional belt. The soil nutrient contents were related not only to the el
ements of parent rocks, but also to the impact of human activities. |
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