摘要
通过对冬小麦植被指数 NDVI的变化规律和不同时期水分胁迫对植被指数的影响研究 ,结果表明 ,冬小麦的植被指数具有日变化规律 ,并且随着冬小麦的生长发育而变化 ,即小麦生长旺盛 NDVI数值较大。不同时期干旱处理 ,小麦 NDVI表现不一致 ,拔节期干旱处理后 ,小麦 NDVI后期反应不明显 ,灌浆期干旱后 ,NDVI反应小 ,抽穗期干旱后 ,NDVI在 5月下旬以后表现。但是土壤水分变化与 NDVI的关系不明显 ,土壤水分对小麦 NDVI的影响是通过对小麦植株体形态的改变来实现的。
NDVI has been developed for qualitatively and quantitatively of evaluating vegetative covers in the field of remote sensing applications. The NDVI is calculated from reflectance measurements in the red NIR potion of the spectrum: NDVI=(NIR-Red)/(NIR+Red). The amount of energy reflected from a plant in the visible and near infrared portion of the spectrum has been correlated to many crop characteristics. In this paper we measured daily and seasonal NDVI dynamic and the effects of water stress in different stages on NDVI. The results showed that with the development of winter wheat, NDVI changed. And during daytime, from sunrise to sunset, NDVI changed too. The relationship between NDVI and soil water content indicated that soil water content could not affected NDVI directly but it could affect crop deve lopment. \;
出处
《干旱地区农业研究》
CSCD
北大核心
2002年第1期69-71,共3页
Agricultural Research in the Arid Areas
基金
河北省科技攻关项目 (编号 0 12 2 0 70 3 D)
国家"973"项目 (编号 G2 0 0 0 0 7790 0 )资助
