کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4379678 1617665 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Groundwater decline and tree change in floodplain landscapes: Identifying non-linear threshold responses in canopy condition
ترجمه فارسی عنوان
کاهش آب های زیرزمینی و تغییر درخت در منظره های سیلاب: شناسایی پاسخ های آستانه غیر خطی در شرایط سایبان
کلمات کلیدی
شرایط کابینگی، دیابت خشکی، نقطه اوج، آستانه محیطی، اکوسیستم های وابسته به آبهای زیرزمینی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی

Groundwater decline is widespread, yet its implications for natural systems are poorly understood. Previous research has revealed links between groundwater depth and tree condition; however, critical thresholds which might indicate ecological ‘tipping points’ associated with rapid and potentially irreversible change have been difficult to quantify. This study collated data for two dominant floodplain species, Eucalyptus camaldulensis (river red gum) and E. populnea (poplar box) from 118 sites in eastern Australia where significant groundwater decline has occurred. Boosted regression trees, quantile regression and Threshold Indicator Taxa Analysis were used to investigate the relationship between tree condition and groundwater depth. Distinct non-linear responses were found, with groundwater depth thresholds identified in the range from 12.1 m to 22.6 m for E. camaldulensis and 12.6 m to 26.6 m for E. populnea beyond which canopy condition declined abruptly. Non-linear threshold responses in canopy condition in these species may be linked to rooting depth, with chronic groundwater decline decoupling trees from deep soil moisture resources. The quantification of groundwater depth thresholds is likely to be critical for management aimed at conserving groundwater dependent biodiversity. Identifying thresholds will be important in regions where water extraction and drying climates may contribute to further groundwater decline.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Global Ecology and Conservation - Volume 2, December 2014, Pages 148–160
نویسندگان
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