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Journal of Mountain Science

, Volume 16, Issue 1, pp 43–53 | Cite as

Grazing impact on forage quality and macronutrient content of rangelands in Qilian Mountains, NW China

  • Alina BaranovaEmail author
  • Jens Oldeland
  • Shun-li Wang
  • Udo Schickhoff
Article
  • 17 Downloads

Abstract

An important indicator of the rangeland health, associated with land degradation, is the ability of semi-natural rangelands to provide forage of sufficient quality for livestock production. In Qilian Mountains (Gansu Province, NW China) biomass production and forage quality are dependent on the seasonality of precipitation and temperature; most of the precipitation falls during summer season, when sheep, goats and yaks graze mountain rangelands. To sustain the rangelands and to improve the management strategies, the assessment of the forage quality should be implemented. The purpose of this research was to study the response of biomass, forage quality and macronutrient content different levels of grazing intensity in Qilian rangelands. We sampled aboveground biomass in the growing seasons in 2012 and 2013 within spring/autumn or summer grazing regimes in two altitudinal zones below and above 3000 m a.s.l. (montane-subalpine and subalpine-alpine respectively). In order to estimate forage quality, biomass was sampled in 1 m × 1 m plots, assigned to the center of 10 ×10 m sites, from which we collected different indicator parameters of rangeland health. Mineral and fiber content of forage biomass was estimated under different levels of grazing intensity with regard to the growing period. It was found that an increase in grazing intensity led to a decrease in dry matter weight. No linearity was observed in the relationship between nutritive value and grazing intensity. The highest fiber content (59.20 %) was found in plots mostly disturbed by grazing. The highest protein (16.30 %) and the lowest fiber (51.30 %) contents were associated with slightly grazing intensity. Concentrations of the mineral elements, such as Zn, P, K and S varied significantly and showed maximum values under low grazing intensity.

Keywords

Grazing intensity Nutritive value Forage quality Mineral concentrations Alpine Subalpine pastures 

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Notes

Acknowledgements

The authors are grateful to Dr. Klaus von Wilpert (Forest Research Institute, Freiburg, Germany) and Dr. Liu Xiande (Academy of Water Resource Conservation Forest of Qilian Mountains (AWRCFQM), Zhangye, Gansu Province, China) for establishing an international research initiative in which this research was embedded. For assistance in laboratory work we thank Prof. Dr. Joerg Ganzhorn and Irene Tomaschewski. We are grateful to the Robert Bosch Foundation (No.070610) for financial support of this joint international project. Financial support of the PhD research project was provided by University of Hamburg’s Doctoral Funding Program (HmbNFG) and merit scholarship program.

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.CEN Center for Earth System Research and Sustainability, Institute of GeographyUniversity of HamburgHamburgGermany
  2. 2.Biodiversity, Ecology and Evolution of PlantsBiocenter Klein Flottbek and Botanical GardenUniversity of HamburgGermany
  3. 3.Academy of Water Resource Conservation Forest of Qilian Mountains (AWRCFQM)Zhangye, Gansu ProvinceChina

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