干旱区生态环境知识资源中心(Arid): 黄土高原半干旱区春小麦冠层光谱对不同程度水分胁迫的响应

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	黄土高原半干旱区春小麦冠层光谱对不同程度水分胁迫的响应
其他题名	Canopy hyperspectral reflectance response for spring wheat in different water stresses in semi-arid areas of the Loess Plateau
	王小平 1; 赵传燕 2; 郭铌 1; 李耀辉 1; 荐圣淇 2; 余凯 2
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2014
卷号	50 期号:3 页码:417-423
中文摘要	于2011年在定西地区开展了观测试验,主要测定了不同水分控制条件下春小麦冠层高光谱反射特征,同步测定了各项生理参数响应。在分析不同水分胁迫下春小麦冠层光谱特征基础上,研究了该地区春小麦冠层光谱对不同水分胁迫的响应特征。结果表明:在水分胁迫下春小麦冠层光谱在可见光区(VIS)和近红外区(NIR)均呈现明显的趋势性变化,随水分减少, VIS光区与短波红外光区(SWIR)反射率都呈增加趋势,而NIR光区反射率呈下降趋势;小麦水分指标冠层等效水厚度(EWT_(canopy))比叶片相对含水量(FMC)能够更敏感地体现水分胁迫变化;光谱指数对不同水分胁迫的响应分析表明, WI指数的监测效果较差;反演半干旱区冠层尺度作物水分,红边植被指数与EWT_(canopy)相关性最高, P RI指数可反映作物水分胁迫后的光合效率变化,间接反映水分状况,但不适合监测重旱; OSAV I 对土壤调节系数的修订比SAV I 提高了相关性;短波红外波段对水分胁迫的变化响应比较稳定,进一步结合红边波段构建新的水分指数有望提高研究区冠层水分的监测精度。
英文摘要	The canopy reflectance in different water stresses was measured at the semi-arid agriculture and meteorological station in Dingxi in 2011, and also were measured the biochemistry parameters with the ASD Field Spec spectroradiometer. This work was mainly to analyze the response characteristics for canopy hyperspectral reflectance in different water stresses. The results indicated that the reflectance value in VIS and SWIR increased and the value in NIR decreased with the water stress being from a light to a severe level. The relative water content (FMC) and equivalent water thickness (EWT) were analyzed and the EWT-canopy could indicate that the water changed better than FMC. Eight spectral indices were selected and the relationship between every index and water content was analyzed. Water Index (W I) was not in a good relation to EW T-canopy, and the vegetation indices based on the red edges of NDV I and REP had good relationships with the crop water content defined with EW T-canopy, as well as with the OSAV I and SAV I. And the P RI could bring about the changes of photosynthesis and show the water status indirectly, but it could well show a light instead of a severe drought in the study area. The wave band in SWIR was responed stably with the EW T-canopy and the new index that combined the red edge and SWIR might improve the precision for drought monitoring.
中文关键词	春小麦 ; 水分胁迫 ; 冠层光谱 ; 半干旱区
英文关键词	spring wheat water stress canopy hyperspectral reflectance semi-arid area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5188532
来源机构	兰州大学 ; 中国气象局兰州干旱气象研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231420
作者单位	1.中国气象局兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室;;中国气象局干旱气候变化与减灾重点开放实验室, 兰州, 甘肃 730020, 中国; 2.兰州大学生命科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	王小平,赵传燕,郭铌,等. 黄土高原半干旱区春小麦冠层光谱对不同程度水分胁迫的响应[J]. 兰州大学, 中国气象局兰州干旱气象研究所,2014,50(3):417-423.
APA	王小平,赵传燕,郭铌,李耀辉,荐圣淇,&余凯.(2014).黄土高原半干旱区春小麦冠层光谱对不同程度水分胁迫的响应.兰州大学学报. 自然科学版,50(3),417-423.
MLA	王小平,et al."黄土高原半干旱区春小麦冠层光谱对不同程度水分胁迫的响应".兰州大学学报. 自然科学版 50.3(2014):417-423.