摘要
在冬小麦主要生育期,测定了3个不同水分处理冠层温度、气温、地面土壤温度以及土壤含水率和叶面积指数,计算了冠气温差和饱和差及相对湿度,并分析了冠气温差与土壤含水率和叶面积指数和饱和差及相对湿度间的关系。结果表明:不同的灌溉措施对冠气温差有显著的影响;14:00左右在冠层之上高度处的冠气温差能反映作物的水分特征,可以用此时刻的实测结果来检验遥感数据反演冠气温差的精度;在60～80cm土层的土壤体积含水率能较好地反映14:00冠层之上冠气温差的变化情况,不同水分处理二者的关系显著,复相关系数分别为0.65809(节水灌溉),0.99577(充分灌溉),0.78206(不灌溉);不同水分处理下的冬小麦主要生育期的叶面积指数与冠气温差相关性显著,冠层之上二者的相关系数分别为:0.76082(节水灌溉),0.40548(充分灌溉),0.99001(不灌溉),这为区域遥感反演作物冠气温差来监测土壤含水率及作物估产提供了依据。
In the growth stage of winter wheat, the canopy temperature, air temperature, soil temperature, volumetric soil water content and leave area index were measured for three different water treatments, and canopy-air temperature difference and relationship among canopy-air temperature difference and volumetric soil water content, leave area index were analyzed. The results indicated that influence of different irrigation treatments on canopy-air temperature difference is different; the canopy-air temperature difference on the height of H2 (above canopy) at 14:00 can reflect crop water stress, can be used to examine accuracy of canopy-air temperature by using Remote Sensing methods; change of volumetric soil water content at the depth 60～80 cm can preferably reflect changes of canopy-air temperature difference at 14:00, the coefficient determination respectively are 0.65809(limited water irrigation), 0.99577 (full irrigation), 0.78206(no irrigation); There is also certain relation between leave area index and canopy-air temperature difference of different water treatments, the coefficient determination respectively are 0.76082 (limited water irrigation), 0.40548 (full irrigation), 0.99001(no irrigation).The results of this study can probably be used for monitoring crop water stress and estimating crop yield by combining remote sensing and crop simulation model.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2004年第3期63-69,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(30270776)
荷兰SAIL基金会的中荷合作项目"可持续土地管理(SULAMA)"(SAIL-SPP299.399)资助
关键词
冬小麦
冠气温差
土壤水
叶面积指数
相对湿度
饱和差
winter wheat
canopy-air temperature difference
soil water
leave area index
relative humidity
saturation deficit
