| Growth disciplinarian of alfalfa sowed in spring and evaluation of climate productivity in the loess plateau of East Gansu |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2007.05.42 |
| Key Words: East Gansu alfalfa growth disciplinarian climate productivity |
| Author Name | Affiliation | | WANG Wei-tai | Key Laboratory of Arid Climate Change and Reducing Disaster Institute of Arid Meteorology CMA,Lanzhou,Gansu 730020；Meteorology Bureau of Qingyang City,Xifeng,Gansu 745000 | | ZHANG Tian-feng | Meteorology Bureau of Qingyang City,Xifeng,Gansu 745000 | | HUANG Bin | Meteorology Bureau of Qingyang City,Xifeng,Gansu 745000 | | YANG Min | Gansu Meteorology Bureau,Lanzhou,Gansu 730020 | | PU Jin-yong | Agro-meteorological Experiment Station of Tianshui,Tianshui,Gansu 741020 | | CHE Xiang-jun | Meteorology Bureau of,Qingcheng,Gansu 745400,China |
|
| Hits: 713 |
| Download times: 523 |
| Abstract: |
| Using the observed data of spring-sowed two years fresh alfalfa growth condition and parallel climatic conditions,analysis is made of the alfalfa's growth height and the speed variation rule with time in the loess plateau area of East Gansu,and the correlation dependence of dry matter and the fresh grass with the activity accumulated temperature.The model is revised according to the forage grass climate productivity photosynthesis output and the temperature and the precipitation,and the climate productivity of alfalfa is computed.The results show that,when sowed in spring,the growth height increase quantity reaches the top in blossoming～withering and turning yellow period in the same year and flower bud appearing～florescence in the second year,while the fastest growth speed occurs in germinating～branching and flower bud appearing～florescence periods.The dry matter weight and fresh grass weight and the activity accumulated temperature reach the maximum simultaneously in branching～flower bud appearing period.The moisture content is the main limiting factor of the alfalfa climate productivity potential in East Gansu.At present there is still a great deal of climate productivity potential in the center north loess knoll gully area for further use. |
|
|
|