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

作者:Peng, DL (Peng, Dailiang)[ 1 ] ; Wu, CY (Wu, Chaoyang)[ 2 ] ; Zhang, B (Zhang, Bing)[ 1 ] ; Huete, A (Huete, Alfredo)[ 3 ] ; Zhang, XY (Zhang, Xiaoyang)[ 4 ] ; Sun, R (Sun, Rui)[ 5 ] ; Lei, LP (Lei, Liping)[ 1 ] ; Huang, WJ (Huang, Wenjing)[ 1 ] ; Liu, LY (Liu, Liangyun)[ 1 ] ; Liu, XJ (Liu, Xinjie)[ 1 ]  ; Li, J (Li, Jun)[ 6 ] ; Luo, SZ (Luo, Shezhou)[ 1 ] ; Fang, B (Fang, Bin)[ 7 ] 

PLOS ONE

卷: 11  期: 6

文献号: e0158173

DOI: 10.1371/journal.pone.0158173

出版年: JUN 27 2016

摘要

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<0.05). The LCC-NPP relationship, which is especially evident for forests in the south-central area, indicates that ecological programs have a positive impact on C sequestration in the TNSP zone. Decomposition analysis generally indicated that the contributions of LCC, drought, and other Natural or Anthropogenic activities (ONA) to changes in NPP generally had a consistent distribution pattern for consecutive years. Drought and ONA contributed about 74% and 23% to the total changes in NPP, respectively, and the remaining 3% was attributed to LCC. Our results highlight the importance of rainfall supply on NPP variability in the TNSP zone.

通讯作者地址: Wu, CY (通讯作者)

Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R China.

地址:

[ 1 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, Key Lab Digital Earth Sci, Beijing, Peoples R China

[ 2 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R China

[ 3 ] Univ Technol Sydney, Plant Funct Biol & Climate Change Cluster C3, Sydney, NSW 2007, Australia

[ 4 ] S Dakota State Univ, Geospatial Sci Ctr Excellence, Brookings, SD 57007 USA

[ 5 ] Chinese Acad Sci, Beijing Normal Univ & Inst Remote Sensing Applica, State Key Lab Remote Sensing Sci, Beijing, Peoples R China

[ 6 ] Chongqing Normal Univ, Coll Geog, Chongqing, Peoples R China

[ 7 ] Columbia Univ, Dept Earth & Environm Engn, New York, NY USA