| 张旭东,杨兴国,杨启国.半干旱区旱作春小麦耗水规律研究[J].干旱地区农业研究,2004,(2):63~66 |
| 半干旱区旱作春小麦耗水规律研究 |
| Study on laws of evapotranspiration of spring wheat in semi-arid region |
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| DOI：10.7606/j.issn.1000-7601.2004.02.13 |
| 中文关键词: 旱作春小麦 耗水规律 需水量 |
| 英文关键词:rainfed spring wheat laws of evapotranspiration crop water requirements |
| 基金项目:国家自然科学青年基金项目(40205005)；甘肃省青年科技基金项目"甘肃中部提高旱作农田水分利用率机理的试验研究 |
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| 中文摘要: |
| 对甘肃定西由大型称重式蒸渗计(Lysimeter)实时观测得到的1993～1997(1995年除外)4a春小麦生育期日蒸散资料进行分析,研究了旱作春小麦的耗水规律及对产量的影响。结果表明:在春小麦生育期内,日耗水量变化的幅度比较大,高值一般出现在较大降水之后;耗水量的年际变化也很大,其最小值还不到最大值的一半;春小麦在整个生长过程中的耗水量远达不到需水量要求,平均相差达1.0mm/d;而耗水量多少及其耗水规律与需水规律是否一致,对春小麦产量的影响十分明显。 |
| 英文摘要: |
| The actual evapotranspiration (ETA) data of spring wheat during 19931997 (except 1995) observed by the Lysimeter in Dingxi prefecture of Gansu Province are analyzed. The results show that: in the whole growth season, the daily variation of ETA is random in al arge range. In generally, there is a high value aftera heavy rainfall. The annual variation of ETA is also obvious, and the minimum-value is less than half of the maximum value. The ETA is significantly less than the crop water requirements (CWR) in the growth season of spring wheat, the mean difference being about 1.0 mm/d. The amount of ETA and its consonance degree to CWR prominently affect the yield of spring wheat. |
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