Remote sensing monitoring and analysis of the vegetation phenological characteristics of the Qinling Mountains-Huanghuai Plain ecotone from 2002 to 2020
WANG Yating1(), ZHU Changming1(), ZHANG Tao2, ZHANG Xin3, SHI Zhiyu1
1. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, China 2. Changsha Natural Resources Comprehensive Survey Center, China Geological Survey, Changsha, 410600, China 3. State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, CAS, Beijing 100101, China
Vegetation phenology shows non-linear and regionally different responses to global changes. Typical differences exist in the climates between the north and the south of the Qinling Mountains. Accordingly, this study investigated the Qinling Mountains - Huanghuai Plain ecotone zone. Based on the MOD09Q1 remote sensing data from 2002 to 2020, this study extracted key parameters of the phenological characteristics of the Qinling Mountains-Huaihe Plain ecotone zone using the adaptive dynamic threshold method. Then, it described in detail the spatio-temporal change process of vegetation phenology in the study area to reveal the spatio-temporal differentiation characteristics. Furthermore, the responses of vegetation phenology to climate changes in the study area were analyzed by combining the temperature data. The study results show that: Significant spatial differentiation characteristics of vegetation phenology existed in the Qinling Mountains - Huanghuai Plain ecotone. Both the start of the growing season (SOS) and the end of the growing season (EOS) of the forest vegetation were later than those of farmland vegetation. Specifically, the SOS and EOS were Day 67-Day 116 and Day 280-Day 340 for forest vegetation and were Day 49-Day 92 and Day 195-Day 328 for farmland vegetation. The length of the growing season (LOS) was 215~262 days for forest vegetation and was 147~261 days for farmland vegetation. In addition, the forest vegetation phenology was affected by altitude. A higher altitude corresponds to a later SOS and an earlier EOS. From 2002 to 2020, the Qinling Mountains-Huaihe Plain ecotone zone generally had early SOS and EOS and shortened LOS. The changing trends of SOS and EOS were -0.14 d·a-1and -0.78 d·a-1, respectively for forest vegetation and 0.1 d·a-1 and -1.43 d·a-1, respectively for farmland vegetation. The vegetation phenological characteristics of the Qinling Mountains-Huaihe Plain ecotone were significantly correlated with regional temperature, especially the temperatures in March and September. The analysis of the data from the existent observation sites shows that the rising temperature advanced the regional phenophases.
王雅婷, 朱长明, 张涛, 张新, 石智宇. 2002—2020年秦岭—黄淮平原交界带植被物候特征遥感监测分析[J]. 自然资源遥感, 2022, 34(4): 225-234.
WANG Yating, ZHU Changming, ZHANG Tao, ZHANG Xin, SHI Zhiyu. Remote sensing monitoring and analysis of the vegetation phenological characteristics of the Qinling Mountains-Huanghuai Plain ecotone from 2002 to 2020. Remote Sensing for Natural Resources, 2022, 34(4): 225-234.
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