Net primary production of Chinese fir plantation ecosystems and its relationship to climate

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Abstract

This article investigates the relationship between net primary production (NPP) of Chinese fir, temperature and precipitation. The spatialoral NPP pattern in the potential distribution area of Chinese fir from 2000-2010 was estimated utilizing a MODIS MOD17 product in a geographic information system (GIS) environment. The results showed that the highest NPP value of Chinese fir is in the Fujian province in the eastern part of the study region. The relationship between NPP of Chinese fir and climate variables was analyzed spatially and temporally. On the regional scale, precipitation showed higher correlation coefficients with NPP than did temperature. The spatial variability pattern indicated that temperature was more important in central and eastern regions (e.g. Hunan and Fujian province), while precipitation was crucial in the northern part (e.g. Anhui province). Zonal analysis revealed that the impact of precipitation on the production was more complicate than that of temperature; larger amount of precipitation is not always corresponding with greater NPP value. When compared to natural forests, plantations appear to be more sensitive to the variability of precipitation, which indicates their higher vulnerability under climate change. Temporally, NPP values decreased despite of increasing temperatures, and the decrease was larger in plantations than among other vegetation types.

Figures

  • Figure 1. Location of the study area (green) in southern China. Names and borders of provinces are shown. Flags represent weather stations located within the study region. Red asterisk indicates Huitong county, which is the central place of Chinese fir production.
  • Figure 2. Distribution of eight vegetation classes as retrieved from the Global Landcover 2000 web site and Chinese artificial forest map.
  • Figure 3. Spatial patterns and temporal changes of climate variables in the study region. (a) temperature surface; (b) precipitation surface; (c) mean annual temperature (MAT); (d) mean annual precipitation (MAP). Mean annual temperature shows significantly increasing trend except a relatively low value in 2008, while mean annual precipitation shows significantly decreasing trend during the study years.
  • Figure 4. A linear comparison of MODIS GPP and observed gross primary production (g C m−2× d−1) at the eddy flux tower site in Qianyanzhou, Jiangxi province. MODIS data are positively related to ground data (r = 0.79, P < 0.0001, n= 25).
  • Figure 5. Spatial pattern of NPP in the study region. (a) spatial pattern of average NPP during study years, the intervals was chosen based on the quartile of cumulative distribution of the NPP; (b) the mean NPP of each vegetation type. Error bars represent standard deviation within vegetation type. Abbreviations: N, coniferous forest; CF, Chinese fir; EB, evergreen broad-leaved forest; DB, deciduous broad-leaved forest; B, bush; F, farmland; M, meadow.
  • Figure 6. Temporal changes of the total net primary production of Chinese fir in the study region from 2000–2010 exhibit a significant decreasing trend.
  • Figure 7. Temporal pattern of NPP in the study region. (a) pixelbased NPP temporal change trend from 2000–2010; (b) the percentage of areas showing a decrease in NPP for each vegetation type. Abbreviations: N, coniferous forest; CF, Chinese fir; EB, evergreen broad-leaved forest; DB, deciduous broad-leaved forest; B, brush; F, farmland; M, meadow.
  • Figure 8. Correlation between net primary production of Chinese fir and climate variables from 2000–2010 on a regional scale. (a) Mean annual precipitation (MAP); (b) mean annual temperature (MAT). They both show linear trends. NPP of Chinese fir is significantly correlated to MAP but not to MAT.

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CITATION STYLE

APA

Wang, L., Zhang, Y., Berninger, F., & Duan, B. (2014). Net primary production of Chinese fir plantation ecosystems and its relationship to climate. Biogeosciences, 11(19), 5595–5606. https://doi.org/10.5194/bg-11-5595-2014

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