Terrestrial ecosystems greatly contribute to carbon (C) emission reduction targets through photosynthetic C uptake.Net primary production (NPP) represents the amount of atmospheric C fixed by plants and accumulated as biomass. The Three-North Shelterbelt Program (TNSP) zone accounts for more than 40% of China’s landmass. This zone has been the scene of several large-scale ecological restoration efforts since the late 1990s, and has witnessed significant changes in climate and human activities.Assessing the relative roles of different causal factors on NPP variability in TNSP zone is very important for establishing reasonable local policies to realize the emission reduction targets for central government. In this study, we examined the relative roles of drought and land cover conversion(LCC) on inter-annual changes of TNSP zone for 2001–2010. We applied integrated correlation and decomposition analyses to a Standardized Evapotranspiration Index (SPEI) and MODIS land cover dataset. Our results show that the 10-year average NPP within this region was about 420 Tg C. We found that about 60% of total annual NPP over the study area was significantly correlated with SPEI (p
1. MODIS NPP product is available from ftp://ladsweb.nascom.nasa.gov/allData/6/MOD17A3H/. 2. MODIS land cover product is available from ftp://ladsweb.nascom.nasa.gov/allData/51/MCD12Q1/. 3. SPEI product is available from http://digital.csic.es/handle/10261/128892.
This study was jointly supported by National Natural Science Foundation of China (41571423 and 41325004), Director Foundation of Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences (Y6SJ0200CX), and Youth Innovation Promotion Association, Chinese Academy of Sciences (Y4YR1300QM).
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Peng, Dailiang; Wu, Chaoyang; Zhang, Bing; Huete, Alfredo; Zhang, Xiaoyang; Sun, Rui; Lei, Liping; Huang, Wenjing; Liu, Liangyun; Liu, Xinjie; Li, Jun; Luo, Shezhou; and Fang, Bin, "The Influences of Drought and Land-Cover Conversion on Inter-Annual Variation of NPP in the Three-North Shelterbelt Program Zone of China Based on MODIS Data" (2016). GSCE Faculty Publications. 2.