Comparison of Soil Biota Between Organic and Conventional Agroecosystems in Oregon, USAEnglish Full Text

WU Shan-Mei1, HU Dun-Xiao2 and E. R. INGHAM3 1 University of California, Berkeley, CA 94720 (USA). 2 China Agricultural University, Beijing 100094 (China) 3 Oregon State University, Corvallis, OR (USA)

Abstract: Soil samples at 0-10 cm in depth were collected periodically at paired fields in Corvallis, Oregon, USA to compare differences in soil microbial and faunal populations between organic and conventional agroecosystems. Results showed that the organic soil ecosystem had a significantly higher （P ＜ 0.05） average number or biomass of soil bacteria; densities of flagellates, amoebae of protozoa; some nematodes, such as microbivorous and predaceous nematodes and plant-parasitic nematodes; as well as Collembola. Greater numbers of Rhabditida （such as Rhabditis spp.）, were present in the organic soil ecosystem while Panagrolaimus spp. were predominant in the conventional soil ecosystem. The omnivores and predators of Acarina in the Mesostigmata （such as Digamasellidae and Laelapid）, and Prostigmata （such as Alicorhaiidae and Rhagidiidae）, were also more abundant in the organic soil ecosystem. However, fungivorous Prostigmata （such as Terpnacaridae and Nanorchestidae） and Astigmata （such as Acarida） were significantly higher （P ＜ 0.05） in the conventional soil ecosystem, which supported the finding that total fungal biomass was greater in the conventional soil ecosystem. Seansonal variations of the population depended mostly on soil moisture condition and food web relationship. The population declined from May to October for both agroecosystems. However, higher diversities and densities of soil biota survived occurred in the organic soil ecosystem in the dry season.

Keywords：

microarthropods; nematodes; organic and conventional agroecosystems; soil microbial population;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S154;

Mobile Reading

Read on your phone instantly

Step 1
Scan QR Codes

"Mobile CNKI-CNKI Express" App

Step 2
Open“CNKI Express”

and click the scan icon in the upper left corner of the homepage.

Step 3
Scan QR Codes

Read this article on your phone.
CAJ Download
PDF Download

Comparison of Soil Biota Between Organic and Conventional Agroecosystems in Oregon, USAEnglish Full Text

WU Shan-Mei1, HU Dun-Xiao2 and E. R. INGHAM3 1 University of California, Berkeley, CA 94720 (USA). 2 China Agricultural University, Beijing 100094 (China) 3 Oregon State University, Corvallis, OR (USA)

Read on your phone instantly

Citation Network

Related Literature