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Plant Ecology

, Volume 196, Issue 1, pp 85–99 | Cite as

Compensatory growth responses to clipping defoliation in Leymus chinensis (Poaceae) under nutrient addition and water deficiency conditions

  • Wei Zhao
  • Shi-Ping Chen
  • Guang-Hui LinEmail author
Article

Abstract

Compensatory growth responses of Leymus chinensis, a dominant species in Inner Mongolia steppe, to clipping defoliation were evaluated in a pot-cultivated experiment under different nutrient (N and P) and water availability conditions. Leymus chinensis exhibited over-compensatory growth at the light and moderate clipping intensities (20% and 40% aerial mass removed) with a greater accumulated aboveground biomass, higher relative growth rate (RGR), more rhizomatic tillers and a stimulation of compensatory photosynthesis to the remnant leaves as compared with those of the unclipped plants. Intense clipping (80% aerial mass removed), which removed most of the aboveground tissues, greatly reduced the growth of aboveground biomass in comparison with that of the unclipped plants. Nitrogen addition only slightly improved the biomass production and RGR in light and moderately clipped plants, and it did not allow plants in the intense clipping condition to over-compensate. Phosphorus addition had no obvious influences on the growth and physiological responses to clipping defoliation. These results indicated that nutrient addition could not compensate for the negative effects of severe clipping on the defoliated grass. On the other hand, there were no distinct positive responses under water deficiency condition for L. chinensis at all clipping intensities with a significant reduction of aboveground and belowground biomass, lower RGR, fewer rhizomatic tillers, and a lower net photosynthetic rate than other wet treatments. Additionally, the chlorophyll contents of remnant leaves gradually increased with the increase of clipping intensities in each treatment. In conclusion, although L. chinensis could compensate for tissues removal by some morphological and physiological responses, intense clipping and drought can result in a significant decrease of biomass and growth rate, even under enriched nutrition conditions.

Keywords

Allocation Biomass Compensatory photosynthesis Defoliation Drought N and P addition Relative growth rate 

Notes

Acknowledgements

This research was supported in part by a Knowledge Innovation Project of the Chinese Academy of Sciences (KSCX2-SW-127) to GH Lin, grants from National Natural Science Foundation of China (30521002 and 90511001) and a “Hundred Talents Program” Project of the Chinese Academy of Sciences to GH Lin. We greatly appreciate Dr. Qing-Zhong Zhang and Dr. Zhi-Yong Zhou for their assistances during the experiment and greatly thank Dr. Wei Sun for his assistance in the revision of this paper. The authors also would like to express their deep gratitude to the two anonymous reviewers, whose comments are valuable in the improvement of this paper.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Key Laboratory of Vegetation and Environmental Change, Institute of BotanyThe Chinese Academy of SciencesBeijingChina
  2. 2.Graduate University of Chinese Academy of SciencesBeijingChina

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