کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
86062 159163 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of silvicultural treatments on temporal variations of spatial autocorrelation in Eucalyptus plantations in Brazil
ترجمه فارسی عنوان
تأثیر تیمارهای حیوانی بر تغییرات زمانی خودکارآمدی فضایی در گیاهان اکالیپتوس در برزیل
کلمات کلیدی
بارور شدن، آبیاری، ساختار پایه، محیط میکرونیزه، رقابت، من مورن
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• Assessed change in spatial structures of Eucalyptus plantations over a rotation.
• Evaluated spatial autocorrelations of diameter, height, and biomass.
• High levels of fertilization induced positive spatial autocorrelation.
• Heterogeneous stand structures had negative spatial autocorrelation.

We examined the change in spatial structures of Eucalyptus plantations across different types of silvicultural treatments over a full rotation. Clonal and seed-origin Eucalyptus plots applied with differing levels of fertilization (high vs. traditional) and irrigation (irrigated vs. non-irrigated) treatments were investigated. Additionally, for the clonal plots, uniform vs. heterogeneous stand structure treatments were created using staggered planting dates. The heterogeneous structure of the clonal plots aimed to mimic the seed-origin plots. Spatial structures were characterized by assessing the spatial autocorrelations of diameters, heights, and biomass. We also applied two distance-based neighborhood structures to look at the degree of change in spatial autocorrelations with different numbers of neighboring trees being defined as neighbors. The results suggest that spatial autocorrelations of diameters, heights, and biomass of Eucalyptus plantations were mostly insignificant at an alpha level of 0.05 over the rotation. However, spatial autocorrelations in most plots after the middle of the rotation were predominantly negative, indicating the occurrence of size differences among neighboring trees. In particular, general declining patterns from positive to negative spatial autocorrelations in diameters and biomass, except for plots with the heterogeneous stand structures, were noted at plots treated with high levels of fertilizer. This suggests that high fertilization may have influenced the realizations of microsite effects in the early stage of stand development. General trends in spatial autocorrelations between the two neighborhood structures considered were mostly similar except for several plots differing in intensities of spatial autocorrelations over the rotation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 358, 15 December 2015, Pages 90–97
نویسندگان
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