| 1 | Detecting climate change effects on forest ecosystems in Southwestern Romania using Landsat TM NDVI data显示文摘现在,西南的罗马尼亚面对气候的大规模 aridization,由温度的上升和猛冲的数量的衰落揭示了,与否定效果可见在其它之中,在森林植被的干燥。现在的学习想识别发生的变化,质量明智在在在西南的罗马尼亚的森林植被的过去的二十年(19902011 ) ,并且在这个区域建立在那些变化和现存热应力之间的连接,特征是其详细规格高平均的年度、季节的温度。以便在气候 aridization 的时候捕获进化,第一步在从三个气象站使用气候数据,温度和降水参数在于;这些参数个别地并且作为干旱索引(De Martonne 和 UNEP ) 被分析。以便确定在森林植被的变化, NDVI 索引被使用并且分析,从 Landsat 卫星图象出发,及时在三不同时刻获得了, 1990, 2000 和 2011。为了识别在 NDVI 的变化之间的连接,索引价值和地区性的热应力,气候的码尺变化,统计关联在平均年度温度的山峰价值之间被建立,在 NDVI 索引在空间,和否定变化代表了,由变化察觉分析揭示了。获得的结果显示有一明显(统计上重要) 在热应力和在分析区域的森林种类的干燥(降级) 之间的连接,与假相思树(Robinia Pseudoacacia ) 要影响的主要种类。 | Remus PRAVALIE Igor SIRODOEV Daniel PEPTENATU | 2014 | Journal of Geographical Sciences2014，24，5： | 4 |
| 2 | Climatic water balance dynamics over the last five decades in Romania's most arid region, Dobrogea显示文摘The analysis of a territory's climatic water balance dynamics against the background of climate change is a key component for increasing water resource management efficiency. The present study aims to analyse climatic water balance(CWB) dynamics in Romania's most arid region, Dobrogea, located in the southeast. The study covers the 1961–2009 period, and is based on annual and seasonal CWB values(mm), provided by nine weather stations located throughout the region. The study, based on statistical and GIS techniques, is divided into two main stages, both carried out at annual and seasonal scales – trend analysis using the Mann-Kendall test, the Sen's slope method, and CWB value distribution type analysis. In order to identify the probabilistic types of distributions, four mathematical models were identified–Pearson, Gamma, Chi-Squared and Wakeby, statistically verified with the P-P Plot, Q-Q Plot and Probabillity Difference Graph(PDG) curve tests. Thus, in terms of trends, the results showed a deficit increase especially at the northern stations, mainly for annual values(with a peak in the northeast, where CWB rates reached –3.2 mm/yr). While general CWB declines occurred in winter, spring and summer, apparent decrease rates were found in the northern region(highest negative rates–summer, northwest, –1.4 mm/yr). Autumn is an exception, due to overall increase rates which peaked in the southwest(2.3 mm/yr). However, the entire trend analysis indicated a general lack of statistical significance. The distribution type histogram analysis showed that, annually and seasonally, deficit values are generally dominant(more noticeable in the northern region), except for the winter season, mainly characterized by surplus intervals. Thus, the results suggest a climatic water deficit increase over the last five decades especially in northern Dobrogea, which signals the need for a spatial prioritization targeting a more efficient water resource management, necessary first and foremost for increasing regional agricultural system productivity. | Georgeta BANDOC | 2015 | Journal of Geographical Sciences2015，25，11： | 1 |
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