| Climate influence and dynamic changes of light energy utilization of winter wheat in Tianshui |
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| DOI：10.7606/j.issn.1000-7601.2010.06.46 |
| Key Words: winter wheat light energy utilization climate influence Tianshui |
| Author Name | Affiliation | | HU Liping | Tianshui Meteorological Bureau, Tianshui, Gansu 741018, China
Agrometeorological Experiment Station of Tianshui，Tianshui, Cansu 741020，China | | ZHANG Hualan | Agrometeorological Experiment Station of Tianshui，Tianshui, Cansu 741020，China | | QIAO Yanjun | Lanzhou Meteorological Bureau of Gansu Prorince, Lanzhou, Gansu 730020, China | | AN Jing | Tianshui Meteorological Bureau, Tianshui, Gansu 741018, China | | LI Jianguo | Meteorological Bureau of Qin'an, Qin'an, Gansu 741600，China | | TAO Qian | Agrometeorological Experiment Station of Tianshui，Tianshui, Cansu 741020，China |
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| Abstract: |
| Based on experimental data of of winter wheat of Tianshui Agrometeorological Experiment Station in 1995~2009 a and the comprehensive zoning data of total radiation of solar energy resources in northwest China, light energy
utilization of whole plant and different organs of winter wheat is calculated in the whole growth period and different growth stages of winter wheat and the impact of climatic factors on them is analyzed . The results show that the light energy uti-
lization of total dry matter including leaf, sheath, stem, ear and grain is 1.30%~2.18%，and the greater the light en-
ergy utilization is, the greater its contribution to the output is; The amount of light energy utilization of various organs is ear> stem> leaf > sheath. The light energy utilization of the whole plant before reviving is comparatively low, under
0.5%，but it increases rapidly after reviving, reaching a peak in the milky stage, around 4%; The light energy utiliza-
tion of leaf and sheath at various growth stages is low, less than 0.5%; While the light energy utilization of stem and ear is higher, and that of the stem reaches the maximum of 1.5% at earing time while that of the ear reaches the maximum of 2.3% at milky stage，which indicates that stem and ear make greater contribution in the light energy utilization of the whole plant of winter wheat . The impact of climate change is very obvious in the light energy utilization of winter wheat, especially precipitation has outstanding effects, showing that the deficiency of precipitation is the main restricting factor to the light energy utilization of winter wheat. So some effective ways and countermeasures are proposed to improve light en-ergy utilization of winter wheat. |
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