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Mammalian herbivory in post-fire chaparral impacts herbaceous composition but not N and C cycling

Journal of Plant Ecology 2021年第2期14卷 213-228页

作者： Lindsey Hendricks-Franco Scott L.Stephens Wayne P.Sousa Department of Integrative Biology University of CaliforniaBerkeleyBerkeleyCAUSA Division of Ecosystem Science Department of Environmental SciencePolicyand ManagementUniversity of CaliforniaBerkeleyBerkeleyCAUSA

Aims Classical theory predicts that herbivores impact herb assemblages and soil nitrogen(N)cycling through selective plant consumption and the deposition of N-rich waste,with effects dependent upon ecosystem N *** are predicted to accelerate N cycling when N availability is high and decelerate cycling when availability is ***,experimental tests of these theories in natural systems are limited and have yielded contradictory ***’s widespread chaparral shrublands provide a tractable system in which to test these *** are prone to periodic crown fire,which temporarily removes living shrub cover,deposits mineral N on soils and allows diverse herbaceous assemblages to dominate the landscape for 3–5 *** is also increasingly vulnerable to herbaceous invasion;mammalian herbivory may limit the establishment of non-native herbs in the shrub *** We implemented a 2-year herbivore-exclosure experiment(Hopland,CA)to assess the impact of mammalian herbivory during early post-fire chaparral succession,both on herbaceous plant assemblages and soil N and C *** predicted that,in high-N post-fire conditions,mammalian herbivory would not demonstrate a strong preference for N-fixing herbs,would accelerate N cycling and would reduce the abundance of non-native *** Findings Excluding mammalian herbivores increased herb standing biomass by 54%,but changed neither the relative abundance of N-fixing ***-N-fixing herbs nor any measure of N or C *** impacts on nutrient cycling may not be significant over the 2-year time scale of the experiment and physical effects of herbivore activity could have counteracted the influence of plant litter and animal dung/urine *** herbivores concentrated their feeding on typical non-native herbs,slightly decreasing their relative abundance;however,mammalian herbivory was not sufficient to stem the invasion of chaparral by invasive herbs

关键词： herbivory fire plant invasion chaparral N cycling

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