نتایج جستجو برای: chronosequence
تعداد نتایج: 759 فیلتر نتایج به سال:
Long-term forest productivity decline in boreal forests has been extensively studied in the last decades, yet its causes are still unclear. Soil conditions associated with soil organic matter accumulation are thought to be responsible for site productivity decline. The objectives of this study were to determine if paludification of boreal soils resulted in reduced forest productivity, and to id...
Forests function as a major global C sink, and forest management strategies that maximize C stocks offer one possible means of mitigating the impacts of increasing anthropogenic CO2 emissions. We studied the effects of thinning, a common management technique in many forest types, on age-related trends in C stocks using a chronosequence of thinned and unmanaged red pine (Pinus resinosa) stands r...
ABSTRACT Ericaceous plants rely on ericoid mycorrhizal fungi for nutrient acquisition. However, the factors that affect composition and structure of fungal communities associated with roots ericaceous remain largely unknown. Here, we use a 4.1-million-year (myr) soil chronosequence in Hawaii to test hypothesis changes availability age determine diversity species roots. We sampled native Hawaiia...
Wildfire plays an important role in restructuring bacterial and protist taxonomic functional communities forest ecosystems. Yet, the recovery of following wildfire has not been rigorously investigated across long-term chronosequences. We compared changes alpha diversity, community composition, co-occurrence networks determinant edaphic factors between burnt unburnt (reference) soils at 11 diffe...
We used measurements from airborne imaging spectroscopy and LiDAR to quantify the biophysical structure and composition of vegetation on a dryland substrate age gradient in Hawaii. Both vertical stature and species composition changed during primary succession, and reveal a progressive increase in vertical stature on younger substrates followed by a collapse on Pleistocene-aged flows. Tall-stat...
We investigated changes in the root-associated fungal communities associated with the ectomycorrhizal herb Bistorta vivipara along a primary succession gradient using 454 amplicon sequencing. Our main objective was to assess the degree of variation in fungal richness and community composition as vegetation cover increases along the chronosequence. Sixty root systems of B. vivipara were sampled ...
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