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Estimating net primary productivity of grasslands from field biomass measurements in temperate northern China

Estimating net primary productivity of grasslands from field biomass measurements in temperate northern China,10.1023/B:VEGE.0000049097.85960.10,Plant

Estimating net primary productivity of grasslands from field biomass measurements in temperate northern China   (Citations: 28)
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Data on field biomass measurements in temperate grasslands of northern China (141 samples from 74 sites) were obtained from 23 Chinese journals, reports and books. Net primary productivity (NPP) of grasslands was estimated using three algorithms (peak live biomass, peak standing crop and maximum minus minimum live biomass), respectively, based on availability of biomass data in sites. 135 samples which have aboveground biomass (AGB) measurements, have peak AGB ranges from 20 to 2021 g m–2 (mean = 325.3) and the aboveground NPP (ANPP) ranges from 15 to 1647.1 g m–2 per year (mean = 295.7). 72 samples which have belowground biomass (BGB) measurements, have peak BGB ranges from 226.5 to 12827.5 g m–2 (mean = 3116) and the belowground NPP (BNPP) ranges from 15.8 to 12827.5 g m–2 per year (mean = 2425.6). In total 66 samples have the total NPP (TNPP), ranging from 55.3 to 13347.8 g m–2 per year (mean = 2980.3). Mean peak biomass and NPP varied from different geographical sampling locations, but they had a general rough regularity in ten grasslands. Meadow, mountain and alpine grasslands had high biomass and NPP (sometimes including saline grassland). Forested steppe, saline grassland and desert had median values. Meadowed and typical steppes had low biomass and NPP (sometimes including desert). The lowest biomass and NPP occurred in deserted steppe and stepped desert. Grassland ANPP has significant positive relationships with annual and summer precipitation as well as summer temperature (all p<0.01). However, grassland BNPP and TNPP have more significant negative relationships with summer temperature (p<0.01) than with annual temperature (p<0.05). The analysis of climate – productivity correlations implied that aboveground productivity is more controlled by rainfall, whereas belowground and total productivity is more influenced by temperature in the temperate grasslands of northern China. The present study might underestimate grassland NPP in northern China due to limitation of biomass measurements. Data on relative long-term aboveground and belowground biomass dynamics, as well as data of standing dead matter, litterfall, decomposition and turnover, are required if grassland NPP is to be more accurately estimated and the role of temperate grasslands in the regional to global carbon cycles is to be fully appreciated.
Journal: Plant Ecology - PLANT ECOL , vol. 174, no. 2, pp. 217-234, 2004
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    • ...Consistent with other reports from Central Asian highlands (Ni 2004; Gao et al. 2008; Yang et al. 2010), we also found that the majority of plant production occurs belowground (Fig. 1). In this high-altitude eco-region, aboveground biomass (presumed to be correlated with NAP) ranges between 40 and 194 g m ¡2 and...
    • ...2010). So, our estimates of NAP and NBP, as well as how each fraction is inXuenced by grazing, appear to be representative of the general pattern seen in this eco-region (Ni 2004; Klein et al. 2007; Gao et al. 2008; Yang et al. 2010)...

    Sumanta Bagchiet al. Herbivore effects on above- and belowground plant production and soil ...

    • ...Precipitation strongly determines AGB in grasslands, and thus has been frequently used to explain the spatial variation in production (Lauenroth, 1979; Sala et al., 1988; Burke et al., 1997; Jobba ´ gy et al., 2002; Ni, 2004a; Fang et al., 2005)...
    • ...Lauenroth, 1979; Sala et al., 1988; Burke et al., 1997; Jobba ´ gy et al., 2002; Ni, 2004a; Fang et al., 2005)...

    Y. H. Yanget al. Aboveground biomass in Tibetan grasslands

    • ...The analysis of climate-productivity correlations implied that aboveground productivity is more controlled by rainfall, whereas belowground and total productivity is more influenced by temperature in the temperate grasslands of northern China (Ni 2004)...

    Zhan-yuan Yuet al. Responses of biomass to the addition of water, nitrogen and phosphorus...

    • ...Ni (2004), compiling data from soil pits and coring, gave belowground net primary productivity (BNPP) estimates of 0.77 to 0.97 of total NPP for Inner Mongolia grassland...
    • ...Ni (2004) gave BNPP/NPP estimates of 0.77–0.97, a range of values which is similar to fΔBGB in 2005 and 2006...

    Ying Zhi Gaoet al. Belowground net primary productivity and biomass allocation of a grass...

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