基于红外热成像技术的沙冬青衰退等级划分  

Application of infrared thermal imaging technology to classify the degradation of endangered plant Ammopiptanthus mongolicus

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作  者:党晓宏 潘霞 刘阳 高永 蒙仲举 胡生荣 DANG Xiaohong;PAN Xia;LIU Yang;GAO Yong;MENG Zhongju;HU Shengrong(Desert Control Science and Engineering College,Inner Mongolia Agricultural University,Hohhot 010018,China;Institute of Water Conservancy Science Inner Mongolia Municipality,Hohhot 010020,China;Wind Erosion Key Laboratory of Central and Government,Hohhot 010018,China;Inner Mongolia Autonomous Environmental Engineering Assessment Center,Hohhot 010011,China)

机构地区:[1]内蒙古农业大学沙漠治理学院,呼和浩特010018 [2]内蒙古自治区水利科学研究院,呼和浩特010020 [3]中央与地方共建风沙物理重点实验室,呼和浩特010018 [4]内蒙古自治区环境工程评估中心,呼和浩特010011

出  处:《干旱区资源与环境》2019年第4期109-116,共8页Journal of Arid Land Resources and Environment

基  金:引进国外先进林业科学技术项目"人工调控荒漠灌丛生态空间构型技术引进(2015-4-22)";内蒙古农业大学高层次人才引进科研启动项目(NDYB2016-08)"资助.

摘  要:由于生境严酷及人类活动影响,古老孑遗物种沙冬青群落出现不同程度的衰退,生存现状岌岌可危。基于此,本研究利用红外热成像技术通过野外现地获取热红外影像,运用ENVI软件提取植被冠层表面温度,并根据'三温模型'计算植被蒸腾扩散系数hat,探明不同衰退等级下沙冬青植被蒸腾扩散系数与其光合参数(净光合速率Pn、蒸腾速率Tr及气孔导度Gs)之间的相关关系。结果表明:(1)依据hat日均值,将沙冬青植株衰退等级划分为:未衰退(hat<0. 50),轻中度衰退(hat在0. 50~0. 65),重度衰退(hat> 0. 65)。(2) Pn、Tr及Gs随hat的升高呈递减趋势。此外,各衰退等级沙冬青光合参数与hat的日变化规律相反。(3)hat与Pn、Tr及Gs能同步反映出植物的生长状态。hat与光合参数的最优回归模型为:Y=a-blnx。因此,热红外成像技术是划分沙冬青衰退程度的一种简单易行的无损伤诊断方法。The relict plant Ammopiptanthus mongolicus was becoming more and more endangered because of increasingly serious climate problems and anthropogenic destruction. The relationship between vegetation transpiration diffusion coefficient( hat) and its photosynthetic parameter(Pn,Tr,Gs) was studied based on infrared thermal imaging technology through three-temperature model and ENVI software. The results showed that:(1) According to the daily average value of hat,the recession grades of the plants with were classified as follows: no recession( hat< 0. 50),slight recession and moderate recession( hatis 0. 50-0. 65),severe recession( hat> 0.65),respectively.(2) Pn,Trand Gsdecreased with the increasing of hat. In addition,the diurnal variation of photosynthetic parameters was opposite to hat.(3) Correlation analysis showed that hat,Pn,Trand Gscould synchronously reflect the growth situation of plants. The optimal regression model of hat and photosynthetic parameters was: Y = a-blnx( Y was the photosynthesis parameters;x was hat;a and b were the constant). This method could obtain plant parameters quickly and accurately without contact and damage. Therefore,thermal infrared imaging technique is a simple and easy method for the diagnosis of the recession grades of Ammopiptanthus mongolicus.

关 键 词:热红外成像技术 沙冬青 植被蒸腾扩散系数 光合参数 

分 类 号:Q945[生物学—植物学]

 

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