| Characters of climate change and winter wheat ecological response in East Gansu |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2009.06.49 |
| Key Words: climate change winter wheat ecological response East Gansu |
|
| Hits: 266 |
| Download times: 183 |
| Abstract: |
| Since 1971 year,the average temperature increased by 0.0525℃/a in semi-humid plateau(Xifeng) and 0.0367℃/a in semi-arid plain(Huanxian),while in the transition area of semi-humid and semi-arid climate(Pingliang),the average temperature increased by 0.0411℃/a.The temperature increase was significant in different areas in four seasons,but not significant in the river valley(Huanxian) in summer.The most extent and significance of increment is the air temperature in semi-humid plateau(Xifeng) in four seasons, and Pingliang next.The increment of air temperature follows the order of winter>spring>autumn>summer.The precipitation of the years was decreased in the plateau(Xifeng) and increased in river valley(Huanxian),but in the transition area of semi-humid and semi-arid climate(Pingliang),the precipitation of the years showed inconspicuous change in the study period.The precipitation in study regions decreased in autumn.The climate warming had sameness,but yet had difference to ecological response of winter wheat in different regions in Longdong loess plateau.The sameness behaved that the date of growth-stopping and milk-maturity had inconspicuous change,and the date of rise had an advance current distinctness.The date of planting delayed but the date of reviving advanced obviously in the plateau(Xifeng),while the date of planting and reviving had inconspicuous change in Huanxian and Pingliang.The tillering defer and the tassel advance was evident in Xifeng and Pingliang,but inconspicuous in Huanxian.The date of maturity advanced and the number of days in the whole growth duration shortened distinctly in Xifeng and Huanxian,but inconspicuously in Pingliang.In addition,the number of tillering was lessened in winter and the next early spring,so the death rate through the winter descended and the yield increased significantly in Xifeng and Pingliang.The significant delaying of grouting period and shortening of maturity occurred in Xifeng and Huanxian.Through colligate analysis,it was considered that the semi-humid plateau(Xifeng) had the most conspicuous character of climate warming and the most significant biological effect on winter wheat. |
|
|
|