摘要
植被物候是响应外界环境变化的重要感应器,本文基于MOD13Q1 EVI数据,采用动态阈值法提取滇中城市群2001—2020年的植被物候参数,即生长季开始期、生长季结束期和生长季长度,揭示植被物候时空变化特征及城乡差异。结果表明:2001—2020年,滇中城市群植被总体呈现生长季开始期推迟、生长季结束期推迟(每年推迟0.66 d)和生长季长度延长的现象;相较于郊区和乡村地区,城区植被近20年的生长季开始期提前(每年1.05 d),生长季结束期推迟(每年0.91 d),生长季长度延长(每年1.79 d)。在城区-郊区-乡村梯度上,植被物候表现出显著的差异性,城区植被平均每年生长季开始期最早,结束期最早,且生长季长度最长,尤其在城区及向外0~2 km范围内变化最明显。随人口密度、人均GDP和建成区面积占比的增大,城区植被物候生长季开始期显著提前,生长季结束期显著推迟,生长季长度显著延长。植被各物候期及其持续时间在城区-郊区-乡村梯度上对环境变化的敏感度不同,研究区人口密度和建成区面积占比对滇中城市群植被生长季结束期的推迟有重要影响。
Vegetation phenology is an important sensor that responds to environmental changes. Based on MOD13Q1 EVI data, we used the dynamic threshold method to extract vegetation phenological parameters of the central Yunnan urban agglomeration from 2001 to 2020, namely the start of growing season, the end of growing season, and the length of growing season, aiming to reveal the spatiotemporal variations in vegetation phenology and urban-rural differences. The results showed that vegetation phenology of the central Yunnan urban agglomeration from 2001 to 2020 generally showed a phenomenon of delayed start of growing season, delayed the end of growing season(0.66 days per year), and prolonged growing season. Compared with suburban and rural areas, growing season in urban areas in the past 20 years had started earlier(1.05 days per year), ended later(0.91 days per year), and thus growing season had been prolonged(1.79 days per year). Vegetation phenology showed significant difference on the gradient of urban, suburban, and rural areas. The start and the end of growing season of urban vegetation were the earliest, and the length of growing season was the longest, with the most significant changes in the urban areas and within the range of 0-2 km outward. The start of growing season in urban area was significantly earlier, the end of growing season was significantly delayed, and length of growing season was prolonged significantly with the increase of population density, per capita GDP, and the proportion of built-up area. The sensitivity of different phenological periods of vegetation and their duration to environmental changes varied on the gradient of urban, suburban and rural areas. Population density and proportion of built-up area in the study area played an important role in delaying the end of growing season of vegetation in the central Yunnan urban agglomeration.
作者
阮文洁
何云玲
黄丽华
RUAN Wenjie;HE Yunling;HUANG Lihua(School of Earth Sciences,Yunnan University,Kunming 650500,China)
出处
《应用生态学报》
CSCD
北大核心
2023年第12期3263-3270,共8页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41961044)资助。
关键词
植被物候
生长季
城市化
vegetation phenology
growing season
urbanization
