The response of root characteristics of Stipa grandis to nitrogen addition in degraded grassland

doi:10.11686/cyxb20140505

Abstract

Abstract:

Stipa grandis forms zonal plant communities widely distributed in the typical steppe region of the Mongolian plateau. In recent decades, due to the over-utilization, the S. grandis grassland has shown different degrees of degradation. Nitrogen is a limiting factor for plant growth in semi-arid grassland. N addition is beneficial to the recovery of degraded grassland, but research on the influence of N addition to root characteristics of grassland plants is rarely undertaken. In order to study the response of root characteristics of S. grandis to N addition in grassland with different degrees of degradation, two sites (lightly degraded and heavily degraded grassland) were selected in Xilingol typical grassland region of Inner Mongolia, and a 2-year N addition experiment was performed (0,30,50,80 g/m² NH₄NO₃). In the heavily degraded grassland, N addition led to a significant increase in root growth of S. grandis. Root length, surface area, volume, root depth and above-ground height were all significantly increased with increased nitrogen input rates, and these measures of plant response were all significantly correlated. In the lightly degraded grassland, however, the root characters of S. grandis were not responsive to N. Comparing the two sites, root diameter in heavily degraded grassland was significantly lower than that in lightly degraded grassland when no N was added. Root length, area, volume, above-ground height and root depth in heavily degraded grassland was significantly higher than that in lightly degraded grassland under high N (80 g/m²) conditions. In heavily degraded grassland, with increased level of soil N, the root system of S. grandis acquires N for development by increasing root length to colonise a greater soil volume.

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CLC Number:

S812.6⁺8

QIN Jie,BAO Ya-jing,LI Zheng-hai,HU Zhi-chao,GAO Wei. The response of root characteristics of Stipa grandis to nitrogen addition in degraded grassland[J]. Acta Prataculturae Sinica, 2014, 23(5): 40-48.

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