辽蒙农牧交错带植被物候变化遥感监测

Remote Sensing Monitoring of Vegetation Phenology in the Ecotone between Agriculture and Animal Husbandry in Liaoning and Inner Mongolia

植被物候信号能够反映温度和降水等变化对植被生长的影响,对理解植物和环境间的相互作用关系、植物的适应机制和生存策略,应对全球变化具有重要的科学意义。研究区为辽宁朝阳、阜新,内蒙古赤峰、通辽,采用非对称高斯函数对2000—2015年研究区MODIS MOD13Q1 NDVI数据重建,提取辽蒙交界地区植被的物候信息——返青期和枯黄期。结果表明,辽蒙农牧交错带植被返青期在16年间表现为明显提前的趋势,赤峰市和朝阳市植被返青期整体呈显著提前,通辽市和阜新市植被返青期呈微弱提前;研究区内植被枯黄期发生变化区域较少,仅赤峰市和通辽市呈微弱延后趋势。

Vegetation phenological signals could reflect the effects of temperature and precipitation on vegetation growth. It was of great scientific significance to understand the interaction between plants and environment, the adaptation mechanism and survival strategy of plants and the global change. In this study, the study area was reconstructed from MODIS MOD13 Q1 NDVI in the study area of Chaoyang and Fuxin of Liaoning, Chifeng and Tongliao of Inner Mongolia, and the asymmetric Gaussian function was used to reconstruct the MODIS MOD13 Q1 NDVI data from 2000 to 2015. The results showed that the vegetation turning greening period in the agriculture and animal husbandryin Liaoning and Inner Mongolia zone showed a tendency to advance in 16 years, and the vegetation return period in Chifeng City and Chaoyang City was significantly ahead of that. The vegetation in Tongliao and Fuxin area were weaker in advance. The area with vegetation change in the study area was less, only Chifeng and Tongliao area showed a slight delay trend.