| 冯东雪,刘海军,高壮壮,唐晓培.夏玉米茎流速率变化规律及其影响因子研究[J].干旱地区农业研究,2020,38(2):185~191 |
| 夏玉米茎流速率变化规律及其影响因子研究 |
| Study on the variation of sap flow rate and its influencing factors in summer maize growth season |
| |
| DOI：10.7606/j.issn.1000-7601.2020.02.26 |
| 中文关键词: 夏玉米 茎流速率；气象因子；作物系数 |
| 英文关键词:summer maize sap flow rate meteorological factor crop coefficient |
| 基金项目:国家重点研发计划项目（2017YFD0201500）；国家自然基金重点项目（51939005）;111引智基地项目（B18006） |
|
| 摘要点击次数: 843 |
| 全文下载次数: 579 |
| 中文摘要: |
| 采用FLOW32-1K包裹式茎流计测量茎流速率，分析2018年夏玉米（郑单958）蒸腾量（本研究采用茎流）与气象因子，包括净辐射、温度、饱和水汽压差（VPD）、风速的相关性，并以Pearson相关性系数进行评价。结果显示：试验期间土壤含水率保持在田间持水率的70%~80%，得出在玉米不受水分胁迫条件下，茎流速率与净辐射、温度、VPD、风速均呈线性相关，相关系数分别为0.754、0.622、0.674、0.443，表明太阳辐射与茎流速率关系最密切，与风速关系最小。在夏玉米生长吐丝期、灌浆期和成熟期，晴天时茎流速率日变化为单峰曲线，早上5∶00茎流开始启动，随后茎流速率逐渐上升，在11∶00茎流速率达到峰值74.5 g·h-1，随后又降低，一般在21∶00降低为0.0。雨天时由于大气辐射不稳定，表现为多峰曲线，且茎流速率波动较大（0~37.7 g·h-1）。经计算夏玉米在灌浆生长期叶面积指数稳定在4.4，这时基础作物系数Kcb为1.0，9月10日后显著下降，至收获时（10月1日）降低至0.55。 |
| 英文摘要: |
| FLOW32-1K wrapped sap\|flowmeter was used to measure sap\|flow rate, and the correlation between transpiration of 2018 summer maize (zhengdan958) (sap\|flow was used in this study) and meteorological factors, including net radiation, temperature, saturation water pressure difference (VPD), and wind speed, were analyzed and evaluated with Pearson correlation coefficient. The results showed that the soil moisture content was maintained at 70%~80% of the field water retention rate during the experiment, and it was concluded that under the condition that maize was not subjected to water stress, the sap flow rate was linearly correlated with the net radiation, temperature, VPD and wind speed, and the correlation coefficients were 0.754, 0.622, 0.674 and 0.443, respectively, indicating that solar radiation had the closest relationship with the sap flow rate and the smallest relationship with wind speed.In the growth period from flowering to maturing stages, the daily sap flow curve on sunny days showed a single peak. It started at 5∶00 AM, then increased and reached the peak value of 74.5 g·h-1at 11∶00 AM, after that decreased and lastly droped to 0.0 at 21∶00. In rainy days, the curve had multiple peaks, and the sap flow rate fluctuated greatly (0~37.7 g·h-1), mainly due to the instability of climate condition. During the grain\|filling stage, the leaf area index was approximate 4.4, and the basic crop coefficient Kcb, the ratio of transpiration to reference evapotranspiration was 1.0, then gradually decreased to 0.55 at harvest. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |