Figure.7 the relationships between the chlorophyll and spectral indices 
^\jndices 
BP 
NDVI 
EVI 
NDWI 
RVI 
PVI 
SAVI 
DVI 
^red 
R670/ 
R440 
LAI 
0.637** 
0.678** 
0.594** 
0.625** 
0.614** 
0.692** 
0.694** 
0.06 
-0.39 
chlorophyll 
0.599** 
0.605** 
0. 684** 
0.583** 
0.489* 
0.622** 
0.621** 
0.957** 
-0.832** 
DW 
0.213 
0.178 
0.068 
0.136 
0.305 
0.169 
0.112 
0.202 
-0.533** 
FW 
0.66** 
0.646** 
0.586** 
0.612** 
0.685** 
0.637** 
0.581** 
-0.546 
-0.003 
PH 
0.532** 
0.541** 
0.444** 
0.5** 
0.563** 
0.539** 
0.508** 
-0.70 
-0.22 
Table.2 the relationship between the spectral indices and the biophysical Parameters (BP) 
4. CONLUSION 
The canopy and leaf reflectance are affected by the plant den 
sity scale in different spectral region in every grown stage. 
Moreover, the difference in booting stage and ripening stage is 
notable; using the spectral reflectance characteristic could 
monitor the grown status. The experiment also indicated the 
possible to distinguish spr-wheat type using NIR region. The 
red edge parameter feature showed that “double peak” at grown 
stage and “blue shift” phenomena from the booting stage to the 
ripening stage. Furthermore, the D A re d maybe used to estimate 
the yield and the A red may indicate the grown stage. Review 
on the relationships between the special variable and the bio 
physical parameter found that the correlation among the rela 
tionship of DVI and LAI is best at whole growth stage, PVI 
and PH and FW are the best. The A red and PH have non 
correlations. Furthermore, A,^ and the chlorophyll has the best 
relationship. This research only obtains the spectral in growth 
stage of the spring wheat, so the change of the whole grown 
stage of the vegetation in arid area needs to study deeply in fu 
ture. 
ACKNOWLEDGMENT 
This work was supported by the national natural science foun 
dation of China (No.40375011) and the project of meteorology 
scientific technology Gansu province (2007-22). 
REFERENCES 
Boochs F , Kupfer G, Dockter. 1990, Shape of the Red 
Edge as Vitality Indicator for Plants. Internal Journal of 
Remote Sensing , 11(12), pp.741-1753. 
WB/m