کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6321344 1619725 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Loss of soil (macro)fauna due to the expansion of Brazilian sugarcane acreage
ترجمه فارسی عنوان
از دست دادن فون خاک (ماکرو) به علت گسترش پوسیدگی سبز برزیل
کلمات کلیدی
محصولات بیولوژیکی، تغییر کاربری زمین، تنوع زیستی خاک،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- We examined the soil macrofaunal community responses to sugarcane expansion from pasturelands.
- Macrofaunal abundance decreases 89% and diversity of macrofauna groups deceases 39% when sugarcane replaces pasture.
- Termites and earthworms largely dominate the macrofaunal community in PA soils.
- Ants and coleopteran insects become the most abundant groups when land use is changed to SC.
- This study draws attention for a significant biodiversity loss belowground due to bioenergy crop expansion in the tropics.

Land use changes (LUC) from pasture to sugarcane (Saccharum spp.) crop are expected to add 6.4 Mha of new sugarcane land by 2021 in the Brazilian Cerrado and Atlantic Forest biomes. We assessed the effects of these LUC on the abundance and community structure of animals that inhabit soils belowground through a field survey using chronosequences of land uses comprising native vegetation, pasture, and sugarcane along a 1000-km-long transect across these two major tropical biomes in Brazil. Macrofauna community composition differed among land uses. While most groups were associated with samples taken in native vegetation, high abundance of termites and earthworms appeared associated with pasture soils. Linear mixed effects analysis showed that LUC affected total abundance (X2(1) = 6.79, p = 0.03) and taxa richness (X2(1) = 6.08, p = 0.04) of soil macrofauna. Abundance increased from 411 ± 70 individuals m− 2 in native vegetation to 1111 ± 202 individuals m− 2 in pasture, but decreased sharply to 106 ± 24 individuals m− 2 in sugarcane soils. Diversity decreased 24% from native vegetation to pasture, and 39% from pasture to sugarcane. Thus, a reduction of ~ 90% in soil macrofauna abundance, besides a loss of ~ 40% in the diversity of macrofauna groups, can be expected when sugarcane crops replace pasture in Brazilian tropical soils. In general, higher abundances of major macrofauna groups (ants, coleopterans, earthworms, and termites) were associated with higher acidity and low contents of macronutrients and organic matter in soil. This study draws attention for a significant biodiversity loss belowground due to tropical LUC in sugarcane expansion areas. Given that many groups of soil macrofauna are recognized as key mediators of ecosystem processes such as soil aggregation, nutrients cycling and soil carbon storage, our results warrant further efforts to understand the impacts of altering belowground biodiversity and composition on soil functioning and agriculture performance across LUC in the tropics.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volumes 563–564, 1 September 2016, Pages 160-168
نویسندگان
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