Intensity of Agro-pastral Land Use and Regional Change of Geo-ecosystems in Northeast Brazil

一般来说，巴西东北部（Nordeste）被分为三个生态区，即Alcida mata，sertao和agreste。本研究从农牧交错带土地利用强度的角度，阐述了人类活动对各生态区区域生态系统的影响，并对干旱半干旱区的影响进行了研究（ICO和克拉托）和调查腰果区酿造业务在塞阿拉的福塔莱萨在过去两年中，今年，我们对奥纳达马塔和阿格斯特的制糖厂和甘蔗种植区的土壤恶化情况进行了调查。结果表明，甘蔗田随着橡胶种植园、班布植被和牧场的糖价下跌而变化。在Borbolema山区的Gravata，形成了由别墅住宅区（Prive）组成的周末度假胜地，很明显，种马牧场（Haras）也位于Gravata周边地区。此外，还发现了利用农村剩余劳动力发展起来的缝纫工业城。另一方面，由古老的火成岩构成的塞尔陶土壤的保水能力很弱，甘蔗区的土壤恶化包括白色砂现象也在沿着发展。如果生产能力的下降被定义为沙漠化，即使是Nordesute它也在平静地移动。我们将在明年出版结果“Nordeste：环境和土地利用”，因为我们申请出版补助金。

Generally, Northeast Brazil (Nordeste) is divided into three ecological zones namely zona da mata, sertao, and agreste. THis study elucidates what kind of influence human activities gave to the regional ecosystem in each ecological zone, from the aspects of landuse strength by agriculture and grazing.In addition to researches in arid and semi-arid region (Ico and Crato) and investigation of cashew nut zone brewing business in Fortaleza of Ceara during past two years, we investigated it about the sugar manufacture factory and the soil deterioration of sugar cane cultivation region in the aona da mata and agreste in this year.As a result it became clear that, sugar cane field varied with hanging low of sugar price in rubber plantation, banboo vegetation, and ranch.And, in Gravata of Borbolema mountainous, the weekend resort which consisted of villa housing complex (Prive) was formed, and it became clear that studhorse ranches (Haras) are located in surrounding area of Gravata, too. Furthermore, we found the sewing industry city where developed by using surplus labor force in rural area.On the other hand water preservation power of the soil in sertao where constituted by old igneous rock was weak, and it became clear that deterioration of the soil to do including white sand phenomenon in sugar cane zone went along. If a fall of production capacity is defined as desertation, even Nordesute it is moving calmly.We will publish the results as "Nordeste : the environment and landuse" next year, because we apply grant-in-aid of publication.