干旱区生态环境知识资源中心(Arid): 不同气象条件下陇中玉米农田生态系统水分利用效率研究

Arid

	不同气象条件下陇中玉米农田生态系统水分利用效率研究
其他题名	Water Use Efficiency of Maize Agroecosystem in Longzhong Region under DifferentWeathers
	阚飞; 岳宁; 丁林凯; 李玲; 魏国孝
来源期刊	灌溉排水学报
ISSN	1672-3317
出版年	2018
卷号	37 期号:10 页码:116-122
中文摘要	【目的】探究陇中半干旱区玉米农田生态系统水分利用情况.【方法】利用陇中半干旱区玉米农田生态系统,涡度系统碳水通量数据,分别从生态系统水分利用效率(WUE)、固有水分利用效率(IWUE)探讨了不同气象条件对半干旱区玉米农田生态系统水分利用效率的影响.【结果】WUE和IWUE在生长季均值分别为4.71 g/kg和32.04(g·hPa)/kg.IWUE考虑了饱和水汽压差(VPD)对蒸散量(ET)的非线性影响,GEP与ET在日尺度上存在滞后效应,而IWUE能有效地减弱滞后效应.阴晴天的光合有效辐射、饱和水汽压差、液流速率、蒸散量均为单峰曲线,晴天的值大于阴天的.阴晴天的碳通量变化不明显,水分利用效率为U型曲线,阴天的碳通量大于晴天的.阴天饱和水汽压差和液流速率与WUE的线性相关关系均较差,晴天的饱和水汽压差和液流速率与WUE的相关关系较阴天好,而IWUE的拟合效果好.【结论】与WUE相比,IWUE能更好地评价该地区碳水耦合情况.
英文摘要	【Objective】Agricultural production and ecosystem functions depend on weather. The purpose of this paper is to put some insight into the water use of a semi-arid maize agroecosystem in Longzhong region.【Method 】Carbon and water fluxes measured from the eddy covariance were applied to estimate the water use efficiency (WUE) and inherent water use efficiency (IWUE) of the agroecosystem. The responses of WUE and IWUE to different weathers were analyzed.【Result】The relationship between gross ecosystem productivity (GEP) and evapotranspiration (ET) was not as strong as the relationship between GPP·VPD and ET, because the nonlinear effect of the vapor pressure deficit (VPD) on ET in the latter was taken into account. The time lag between GEP and ET resulted in a hysteresis curve, and IWUE reduced the effect of this hysteresis. Photosynthetically active radiation (PAR), VPD, flow rate and ET can be fitted into a single-peak curve for both sunny and cloudy days, with the associated values in sunny days larger than that in cloudy days. The variation of the net ecosystem CO_2 exchange (NEE) was similar in sunny and cloudy days, and the water use efficiency was in a U-shaped curve with the corresponding value for cloudy days larger than that for sunny days.【Conclusion】The dependence of WUE on VPD and the flow rate in cloudy days are not as good as that in sunny day because of the disturbance of vapor. IWUE can improve the correlation coefficient. Compared to WUE, IWUE is more appropriate to describe water and carbon interaction in this area.
中文关键词	陇中 ; 农田生态系统 ; 水分利用效率 ; 固有水分利用效率
英文关键词	Longzhong agroecosystem water use efficiency inherent water use efficiency
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6342595
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237788
作者单位	兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	阚飞,岳宁,丁林凯,等. 不同气象条件下陇中玉米农田生态系统水分利用效率研究[J]. 兰州大学,2018,37(10):116-122.
APA	阚飞,岳宁,丁林凯,李玲,&魏国孝.(2018).不同气象条件下陇中玉米农田生态系统水分利用效率研究.灌溉排水学报,37(10),116-122.
MLA	阚飞,et al."不同气象条件下陇中玉米农田生态系统水分利用效率研究".灌溉排水学报 37.10(2018):116-122.