کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5742731 1617770 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research PaperEffect of land use and management practices on microbial biomass and enzyme activities in subtropical top-and sub-soils
ترجمه فارسی عنوان
مقاله پژوهشی تاثیر شیوه های استفاده و مدیریت زمین بر فعالیت های زیست توده های میکروبی و فعالیت آنزیم در زیر و بوته های زیرزمینی
کلمات کلیدی
استفاده از زمین، جنگل، کشاورزی ارگانیک، کشاورزی عادی، کیفیت خاک، عمق خاک،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


- Microbial biomass was higher in organic farming topsoil than other land use.
- Higher C cycle enzymes activities except xylanase in topsoil under organic farming.
- Activities of N and S cycle enzymes were also higher in organic farming topsoil.
- Xylanase and phosphatase activities were higher in conventional farming topsoil.
- Land-use has smaller effect on microbial properties in subsoil.

Land-use change, especially from forest to intensive agriculture, is negatively impacting soil quality and sustainability. Soil biological activities are sensitive indicators of such land-use impacts. We tested two hypotheses: i) land use and management practices affect microbial properties (microbial biomass and enzyme activities) in topsoil (0-20 cm), but have no effects in subsoil (20-100 cm); and ii) microbial properties in topsoil are highest in forest, followed by organic farming and then conventional farming.Total organic C and N contents as well as microbial biomass were significantly higher in the organic farming topsoil compared with conventional farming and forest. Except xylanase and acid phosphatase, enzyme activities (β-glucosidase, cellobiohydrolas, chitinase, sulfatase, leucine aminopeptidase and tyrosine aminopeptidase) were also higher in organic farming soil. Crop residues and rhizodeposits support higher microbial biomass, leading to enhanced enzyme activities in organic farming soil. Incorporation of rice stubble and limitation of available phosphorus explain the higher xylanase and acid phosphatase activities, respectively, in conventional farming soil. Litter removal leads to a deficiency of labile C and N, resulting in lower enzyme activities in forest soil. Total C and N contents were higher in subsoil under organic farming. Although there was no effect of land use on microbial biomass in subsoil, activities of most enzymes were higher under organic farming.Overall, our results indicate that land-use change significantly alters microbial properties in topsoil, with modest effects in subsoil. Microbial properties should be considered in environmental risk assessments and models as indicators of ecosystem disturbance caused by land-use and management practices.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Soil Ecology - Volume 113, May 2017, Pages 22-28
نویسندگان
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