Data/hora: 24/09/2024 21:04:56

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	02/10/2008	
Data da última atualização: 	02/10/2008	
Autoria: 	WILD, A.-K.; MARX, M. T.; EISENBEIS, G.	
Título: 	An effective and low cost method to simulate environmental changes like flood and drought under natural conditions.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.	
Idioma: 	Inglês	
Conteúdo: 	Micro-, Meso- and Macrofauna in the soil often demonstrate changes of environmental conditions,
which results in a changing community structure and density. Effects of changing soil parameters
have often been analysed by taking a sample out of the study site into a laboratory. But this
method lacks the possibility to test the effect under natural environmental conditions. We applied
a method which gives us the possibility to manipulate different environmental parameters of the
investigation area. In a floodplain habitat we change hydrological parameters by otherwise steady
conditions. As an investigation device we used tubes made of PVC with a diameter of 7,0cm
and a height of 30cm. On the one hand we simulated a total flood which lasts 15, 30, 60 and 90
days, on the other hand we imitated a drought lasting 30, 60, 90 and 120 days. Afterwards we
took the soil samples out of the investigation site and examined the arthropod composition in
the laboratory using different extraction methods. In order of simulating a flood we obdurate the
tubes at the lower surface with a cap sealed up with a rubber band. Then we filled up the tubes
with soil cores and flooded the tubes with water. In another experiment we simulated drought
conditions in a similar way. Reversing the tubes allows us testing the drought. We closed the
cylinders at the upper surface with a laterally perforated cap, which avoids the tubes from rainwater
infiltration, but makes air-circulation possible. In the same manner we handled the control reflecting
the normal environmental conditions. Leaving the tubes open at the upper und under surface
allowed us to test the natural unchanged conditions.
Several advantages of this investigation method are obvious. It is a very cheap method testing
soil organisms in the natural habitat. Because of its cost effectiveness it is possible to increase
the sample size, which allows further statistical analysis. Furthermore its handling is very simple.
Another advantage is the possibility of changing the size of the soil sample by altering the
diameter of the tubes. So it is unproblematic to find an adequate sample size for special problems
and questions. The limitation of investigations to the tubes finally minimizes the disturbance of
the study site, which is of special interest in natural protection areas.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (43764-1) - UPE - PL - -- - CD0305 -  -  - DIS