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Warner College of Natural Resources

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https://hdl.handle.net/10217/195522
These digital collections include the materials from the Mongolia Project and datasets from the Warner College of Natural Resources.

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Browsing Warner College of Natural Resources by Subject "biomass"

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    ItemOpen Access
    20-year vegetation change data in three ecological zones in Mongolia
    (Colorado State University. Libraries, 2020) Jamiyansharav, Khishigbayar; Fernandez-Gimenez, Maria
    Mongolian rangelands have experienced warming temperatures and increasing livestock densities over the past 20 years. Remote sensing studies report widespread degradation, but there are no long-term field studies of vegetation responses to shifts in climate and stocking densities. In 2013, we resampled plots originally sampled in 1994-1995 in the desert-steppe, steppe and mountain-steppe, and analyzed changes in vegetation in relation to changes in climate, stocking densities and forage use. Summer temperatures significantly increased and stocking densities fluctuated in response to droughts followed by harsh winters. Total herbaceous biomass in 2013 was similar to (desert-steppe and steppe) or greater than (mountain-steppe) in 1995, and total foliar and herbaceous cover were unchanged since 1995 in all zones. In the mountain-steppe, functional type and species cover shifts were consistent with warming temperatures and increasing grazing pressure. All species richness and diversity indicators declined significantly in the mountain-steppe since 1995 as did richness in the steppe. Some Mongolian rangelands may be losing resilience due to interacting climate and grazing pressures, but our data suggest degradation observed at our study sites is reversible. Mountain-steppe systems appear more vulnerable to grazing- and climate-induced vegetation change than steppe and desert-steppe.
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    ItemOpen Access
    Do formal, community-based institutions improve rangeland vegetation and soils in Mongolia more than informal, traditional institutions?
    (Colorado State University. Libraries, 2015-06) Reid, Robin S., author; Jamsranjav, Chantsallkham, author; Fernandez-Gimenez, Maria E., author; Angerer, Jay, author; Tsevlee, Altanzul, author; Yadambaatar, Baasandorj, author; Jamiyansharav, Khishigbayar, author; Ulambayar, Tungalag, author; Nutag Action and Research Institute, publisher
    Since the 1990's, herding communities across Mongolia have established over 2000 community-based rangeland management (CBRM) organizations to improve livestock grazing management and reverse perceived declines in rangeland (grassland) productivity. Here, we compare the vegetation and soils of rangelands managed by these formal community-based herder groups (CBRM) with those managed by informal traditional neighborhoods (non-CBRM) in four ecological zones across Mongolia. A companion study shows CBRM used both traditional and innovative rangeland management practices more often than traditional neighborhoods. We hypothesized that this should then result in better rangeland vegetation and soils in CBRM-managed than non-CBRM managed rangeland. We sampled vegetation and soils in winter pastures around 143 livestock camps or water points in soums (counties) with and without CBRM management. We explicitly controlled for grazing intensity by sampling plots along grazing gradients at 100, 500 and 1000 m from these impact points. At each 50 x 50 m plot (n=428) we sampled standing biomass, plant cover, basal gap, species richness, forage quality, and soil and site characteristics. We also compared paired time series of MODIS NDVI data in counties with and without CBRM organizations from 2000-2014 to quantify changes in length of the growing season, and current and previous season greenness (a proxy for biomass accumulation). We then analyzed all data using general linear models and χ2 tests. CBRM had surprisingly few and subtle impacts on vegetation and soils in Mongolia's rangelands, whether measured in the field or by remote sensing, compared with areas managed by more traditional neighborhood groups. Some CBRM pastures supported more litter biomass, plant connectivity and less soil erosion, and a lower abundance of grazing tolerant or annual plant species than non-CBRM pastures in some ecological zones. CBRM management appears to modestly improve vegetation condition in the steppe than other ecological zones. At the soum level, we could see no differences in the length of the growing season, current season greenness or current and previous season greenness of the vegetation over the 15 years from 2000-2014. We did find, however, that herding families that participate in CBRM groups hold more livestock, sometimes twice as many, in 3 of the 4 ecological zones. This suggests that CBRM management may be having more impact on pastures than our data show, since these pastures can support more livestock without losing rangeland vegetation abundance and soil retention capacity.