山西省植被物候时空变化以及地形对物候的影响  

Temporal-spatial variations of vegetation phenology and the influence of topography on phenology in Shanxi Province

作　　者：王贝贝 周淑琴[1] 荆耀栋[1] 宋晓静 王荣宇 WANG Bei-bei;ZHOU Shu-qin;JING Yao-dong;SONG Xiao-jing;WANG Rong-yu(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,Shanxi,China)

机构地区：[1]山西农业大学资源环境学院,山西太谷030801

出　　处：《生态学杂志》2021年第6期1839-1848,共10页Chinese Journal of Ecology

基　　金：山西省软科学研究计划项目(2016041036-2和2018041004-1);山西农业大学科技创新基金(2018YJ23和2015ZZ05)资助。

摘　　要：为了解山西省植被物候特征,基于MODIS NDVI数据,采用Double Logistic拟合法重建2000—2015年的MODIS NDVI时间序列,利用动态阈值法提取研究区植被物候,并分析植被物候的时空变化和地形差异对物候的影响。结果表明:山西省2000—2015年物候变化显著,植被生长季开始日期(the start of the growing season,SOS)每年提前约0.7 d(R^(2)=0.665,P<0.01),生长季结束日期(the end of the growing season,EOS)每年推迟约1.5 d(R^(2)=0.601,P<0.001),生长季长度(the length of the growing season,LOS)每年延长约2.2 d(R^(2)=0.772,P<0.001);不同植被物候变化速率不同,植被SOS按提前速率依次为草地>农作物>林地;EOS按推迟速率依次为林地>农作物>草地;LOS按延长速率依次为林地>草地>农作物;区内植被物候空间差异显著,植被SOS、EOS、LOS由低纬度到高纬度,从西经到东经依次表现为推迟、提前、缩短;研究区植被物候在海拔、坡向、坡度3种地形因子上差异显著;海拔1200 m以下,植被物候随海拔变化显著,海拔升高植被SOS显著推迟、EOS显著提前、LOS显著缩短;阳坡SOS比阴坡提前约1 d,EOS推迟约0.8 d,LOS延长约1.8 d;坡度小于16°的区域,坡度增大,SOS显著提前,EOS显著推迟,LOS显著延长;植被物候在长时间尺度上变化显著,而在同一个时间段内,地形是物候存在空间差异的重要影响因子。To clarify the vegetation phenology characteristics in Shanxi Province,we reconstructed the MODIS NDVI time series from 2000 to 2015 by adopting the Double Logistic fitting method,extracted vegetation phenology using the dynamic threshold method,and then analyzed temporal-spatial variations of phenology and the effects of topography on phenological changes. The results showed that phenology in Shanxi Province changed significantly from 2000 to 2015. The start of the growing season( SOS) was advanced by about 0.7 d per year( R^(2)= 0.665,P<0.01).The end of the growing season( EOS) was delayed by about 1.5 days per year( R^(2)= 0.601,P<0.001). The length of the growing season( LOS) was extended by about 2.2 days per year( R^(2)=0.772,P< 0. 001). The phenological change rate varied with different vegetation types. Grasslands showed the highest rate of SOS changes,followed by crops and then forestland. Forestland had the highest change rate of EOS,followed by crops and grassland. Forestland had the highest change rate of LOS,followed by grassland and then crops. There were substantial spatial variations in vegetation phenology. From low latitude to high latitude and from west to east,the SOS was delayed,EOS was advanced,and LOS was shortened. Vegetation phenology was significantly different across altitudes,slope aspects,and slope degrees. Vegetation phenology changed significantly with altitude below 1200 m. At higher altitude,SOS was significantly delayed,EOS significantly was advanced,and LOS was significantly shortened. Compared with shade slope,SOS at sunny slope was advanced by about 1 d,the EOS was delayed by about 0.8 d,and the LOS was extended by about 1. 8 d. In areas with slope less than 16°,SOS was advanced,EOS was delayed,and LOS was extended with the increases of slope. Our results indicate that vegetation phenology varies greatly over a long time span and topography is a crucial factor influencing the spatial pattern of phenology.

关 键 词：植被物候 时空变化 地形差异 山西省 

分 类 号：Q948[生物学—植物学]