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Pampan grounds with more insects by agriculture

Pampan grounds with more insects by agriculture

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Great part of the fields of the Pampan Region is invaded by not-native grass when the lots leave production. A study determined that these plants increase the amount of subterranean fauna, which, as well, would make possible its high permanence in the pastures.

Like in other pastures of the world, in Inner Pampas, province of Buenos Aires, after which the producers stop making agriculture, the fields undergo the invasion of pulses not-native €” or exotic that after to settle down last in the time without other plants can replace them. With the intention to deepen in the causes of this persistence, investigators of the Faculty of Agronomy of UBA (FAUBA) realised a study that demonstrated that the not-native grass precise generates changes in the ground €”, in the fauna of arthropods, which, as well, would harness the great persistence of those invaders.

Equipment FAUBA measuring amount of pollenizers

€œIn previous studies one saw that in Inner Pampas, the pastures do not return to their original state when stopping agriculture; a strong invasion by exotic plants takes place that they replace to the native ones and they diminish the vegetal diversity. Our experiments were further on: we saw what happened in those pastures to the fauna of the ground, especially with the arthropods €” among others, insects, arachnids and crustaceans of 0.2 mm €”, in comparison with relicts of the original pasture that still are within that same landscape€ explained Gimena Vilardo, recently withdrawn of the Degree in Ciencias Ambientales (FAUBA).

Vilardo indicated that its work, published in the magazine Oecologica Act, revealed remarkable differences in the composition of arthropods of the ground between pastures invaded and not invaded by exotic plants. €œIn our site of study, next to Carlos Casares, province of Buenos Aires, we found that the abundance of arthropods of the ground in the post-agricultural pastures was a 75% major that in the areas of natural vegetation that still are in the landscape. In some cases, the difference was 100 individuals by parcel€.

The investigator deepened in other differences that detected between both types of pasture. €œIn grounds of the pastures dominated by not-native grass as arundinacea Festuca we registered majors levels of nitrogen and potassium, higher temperatures and a greater biological activity than in grounds of the relicts of natural vegetation. Then, the invasion of plants affected so much the vegetal biodiversity as the fauna and the biological processes of grounds€.

€œOn the other hand €” Vilardo- added, in comparison with the invaded areas, the grounds of the natural pastures presented a diversity of arthropods more elevated. This would be due to the varied botanical composition of these relicts, dominated by I graze Paspalum quadrifarium. That would stimulate a greater diversity of arthropods of the ground€.

Of exotic and grounds

The investigator put emphasis in the relations between the vegetal communities and the fauna of the ground. €œThe not-native ones have more quality, grow more if the ground is fertile and their weaves are disturbed faster. These characteristics would generate significant changes in the composition of the fauna €” as we also saw with the arthropods and in the microorganisms of the ground. This information is valuable in relation to our general mission, that is to explain the persistence of the invading plants€.

In the same sense, Laura Yahdjian, educational of the chair of Ecology of the FAUBA and director of the thesis of degree of Vilardo, added that it is possible that the dominance of the exotic ones in the post-agricultural ecosystems obeys to biological processes that take place under earth. €œOf previous works we knew that in grounds where there are not-native plants, the organic matter is disturbed faster and the fertility is major that in the natural relicts. On the other hand, the study of Gimena confirms to us that the community of exotic maintains a different fauna in the ground, whose operation, as well, would favor the growth of the invading plants. Today, these seem to be restraining the reestablishment of the original species of the pasture, and the loss of biodiversity is enormous€.

A unique system

€œThe work of Gimena concentrated in a group of closings €” areas wire fences to exclude the farming activities that are within the Stay €˜San Claudius€™ (GRAPE), in Carlos 

You will marry, province of Buenos Aires, and in the surrounding landscape. The system of closings was designed and created in the decade of 1970 by Alberto Soriano and Rolando Le³n, who were professors of the FAUBA, with the idea to study how he changes the vegetation once he is stopped making agriculture€, he affirmed to Pedro Tognetti, educational of the Department of Quantitative Methods and Information systems of the FAUBA and coauthor of the work of Vilardo.

Tognetti maintained that it is property left at death a unique system made up of closings in sites post-agricultural and pastures. €œThey are possible to be realised experiments and on approval to be put tie hypothesis very varied to the interactions between species of plants and animal or to the biological invasions, or to be studied in what moment a community dominated by exotic plants can return to its composition dominated by native grass. Within the framework of this system they formed, and they nowadays continue doing it, a great number of investigators€.

€œWhile there are experiments in which test tubes in laboratory are used, in our group of investigation in lots or closings. We are worth of controlled experiments in which, for a same landscape of Inner Pampas, areas of original pasture with others coexist in which they were stopped realising farming activities. The idea always is to compare both situations to evaluate the effects that can have agriculture on the system. As a example, nowadays there are investigators, students and scholarship holders of the FAUBA analyzing the impacts of the drought, the invasion of trees and the climate change generally, among others subjects€, she emphasized with Tognetti pride.

SOURCE: On the Earth (SLT-FAUBA)

Pampan grounds with more insects by agriculture

  • WideDesktopWallpapers in Sunflower

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  • Homemade refuges to attract pollenizers

    To create homemade refuges for pollenizers. A productive experience.

  • Biodiversity to the Edge

    The reservoirs of natural vegetation that survived the Pampan agriculturizaci³n in wire fenced hard shoulders and could serve to recover multiple functions that were lost, fundamental in the ecosystems.

  • Multifunctional landscapes in Expoagro

    The Project appeared in the stand of Syngenta in Expoagro where integral of the Conicet they explained the benefits to preserve to the pollenizers.

  • Santiago Poggio traveled to Chile

    Santiago Poggio traveled to Chile 2016   The Dr. Santiago L. Poggio, of the chair of Vegetal Production, traveled to the central region of Chile to evolve as external consultant in the evaluation of the preliminary results of the application of the programs €œOperation Pollinator/Good Growth Plan€, implemented by Syngenta South Latin America. The activities extended

Pampan grounds with more insects by agriculture

  • WideDesktopWallpapers in Sunflower

    According to it published the La Naci³n newspaper the pollenizers are allied of the Argentine sunflower

  • Homemade refuges to attract pollenizers

    To create homemade refuges for pollenizers. A productive experience.

  • Biodiversity to the Edge

    The reservoirs of natural vegetation that survived the Pampan agriculturizaci³n in wire fenced hard shoulders and could serve to recover multiple functions that were lost, fundamental in the ecosystems.

  • Multifunctional landscapes in Expoagro

    The Project appeared in the stand of Syngenta in Expoagro where integral of the Conicet they explained the benefits to preserve to the pollenizers.

  • Santiago Poggio traveled to Chile

    Santiago Poggio traveled to Chile 2016   The Dr. Santiago L. Poggio, of the chair of Vegetal Production, traveled to the central region of Chile to evolve as external consultant in the evaluation of the preliminary results of the application of the programs €œOperation Pollinator/Good Growth Plan€, implemented by Syngenta South Latin America. The activities extended