Seasonal Responses of Net Primary Productivity of Vegetation to Phenological Dynamics in the Loess Plateau, China  

作　　者：HAN Hongzhu BAI Jianjun MA Gao YAN Jianwu WANG Xiaohui TA Zhijie WANG Pengtao 

机构地区：[1]School of Tourism&Research Institute of Human Geography,Xi'an International Studies University,Xi'an 710128,China [2]School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China [3]China Academy of Space Technology-Xi'an,Xi'an 710000,China [4]School of Humanities and Social Sciences,Xi'an University of Posts and Telecommunications,Xi'an 710121,China

出　　处：《Chinese Geographical Science》2022年第2期340-357,共18页中国地理科学（英文版）

基　　金：Under the auspices of MOE(Ministry of Education in China)Project of Humanities and Social Sciences(No.20YJC840027);Natural Science Basic Research Program of Shaanxi,China(No.2021JQ-771,No.2021JQ-768);Soft Science Project of Xi’an Science and Technology Bureau,Shaanxi Province(No.2021-0013)。

摘　　要：With global warming, the great changes in the patterns of plant growth have occurred. The conditions in early spring and late autumn have changed the process of vegetation photosynthesis, which are expected to have a significant impact on net primary productivity(NPP) and affect the global carbon cycle. Currently, the seasonal response characteristics of NPP to phenological changes in dryland ecosystems are still not well defined. This article calibrated and analyzed the normalized difference vegetation index(NDVI)time series of Advanced Very-High-Resolution Radiometer(AVHRR) data from 1982 to 2015 in the Loess Plateau, China. The spatial and temporal distributions of vegetation phenology and NPP in the Loess Plateau under semihumid and semiarid conditions were investigated. The seasonal variation in the NPP response to vegetation phenology under the climate change was also analyzed. The results showed that, different from the northern forest, there was distinct spatial heterogeneity in the effect of climate change on the dynamic change in vegetation growth in the Loess Plateau: 1) an advance of the start of the growing season(SOS) and a delay of the end of the growing season(EOS) significantly increased the NPP in spring and autumn, respectively, in the humid southeast;2) in the arid northwest, the NPP did not significantly increase in spring and autumn but significantly decreased in summer.

关 键 词：climate change normalized difference vegetation index PHENOLOGY net primary productivity Loess Plateau China 

分 类 号：P467[天文地球—大气科学及气象学] Q948[生物学—植物学]