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Positive and negative impacts of insect frass quality on soil nitrogen availability and plant growth

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Population Ecology

Abstract

Frass deposition to soil is an important pathway by which herbivorous insects impact decomposition and soil nutrient availability. However, little is known about how frass quality influences ecosystem properties. Here, we examined the effects of frass quality on the decomposition process, soil nitrogen (N) availability, and plant growth, using frass of Mamestra brassicae (L.) that fed on fertilized or unfertilized Brassica rapa L. var. perviridis Bailey. The frass quality was largely dependent on the host plant quality. Frass excreted by larvae that fed on the fertilized plants had higher N than that of larvae that fed on the unfertilized plants. The decomposition rate of the frass did not differ between N-rich and N-poor frass, except during the early decomposition period. The inorganic N concentration decreased during decomposition in both frass types. However, difference in the initial inorganic N concentration led to different consequences regarding soil N availability. Furthermore, addition of frass to the soil differently influenced the growth of B. rapa plants depending on the frass quality: plant biomass was increased by N-rich frass addition but decreased by N-poor frass addition, compared to the biomass without frass addition. These results indicate that frass quality is an important factor in determining the impact of herbivorous insects on nutrient dynamics, and that frass positively or negatively influences soil N availability and plant growth, depending on its quality.

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Acknowledgments

We thank T. Matoh and M. Uefune for valuable information on B. rapa culture, A. Fuchikawa for help in maintaining M. brassicae populations, and S. Kita for help in measuring nitrate and ammonium concentrations. We also thank E. Nakajima for the English proofreading of our manuscript. This study was supported by a JSPS Research Fellowship for Young Scientists, Grant-in-Aid for Scientific Research (B-20370010), and Kyoto University Global COE Program (A06).

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  1. Center for Ecological Research, Kyoto University, Hirano 2-chome, Otsu, Shiga, 520-2113, Japan

    Hideki Kagata & Takayuki Ohgushi

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  1. Hideki Kagata
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  2. Takayuki Ohgushi
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Correspondence to Hideki Kagata.

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Kagata, H., Ohgushi, T. Positive and negative impacts of insect frass quality on soil nitrogen availability and plant growth. Popul Ecol 54, 75–82 (2012). https://doi.org/10.1007/s10144-011-0281-6

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