| Ecology and Economics |
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| Impact of Different Sampling Units on Ground Spectral Models for Estimating Wheat Aboveground Biomass in Oases of Arid Zone |
| SUN Xiao-yan, CHANG Xue-li, ZHANG Ning, HAN Yan |
| Geography and Planning College, Ludong University, Yantai 264025, Shandong, China |
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Abstract For best understanding relationship between wheat hyperspectral property and aboveground biomass, we employed ASD Fieldspec HandHeld Spectroradiometer to measure the wheat reflecting spectrum in different oases in Hexi Corridor. Based on different sampling units, four ground spectral models in relation to Normalized Difference Vegetation Index (NDVI), including linear, logarithm, power, and exponent methods, of the aboveground biomass (ANPP, Aboveground Net Primary Productivity) were built. Results showed that all of the models were significant at 0.01 levels (n=20 for single oasis and n=34 for entire oases). Based on determination coefficient (R2) and error analysis, the exponential model was considered to be the best among these models in different sampling units. Among them, the models for Zhangye oasis, Jiuquan oasis and whole oases in Hexi corridor could be expressed by the equation: ANPP=0.1567e12.568NDVI(R2=8123), ANPP=0.4082e11.108NDVI(R2=0.8321) and ANPP=17.255e5.4326NDVI(R2=0.7369), respectively. The model built for single oasis might be used to other oases, but it couldnt be used to the whole region; for estimating the data in the whole region, the model should be built by data obtained from different oases of the Hexi corridor.
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Received: 06 July 2011
Published: 20 March 2012
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2012, Vol. 32 
