RESUMEN
This study aimed to investigate the vegetation production changes in Khuzestan province, Iran using MODIS data production, meteorological data, vegetation maps as well as topographic and field monitoring data in CASA model. The study area was divided into different climatic classes based on multivariate statistical method, so the vegetation of each climatic region was examined separately for changes in NPP values. Production changes due to degradation were calculated using the Miami model and subsequently, the rain use efficiency (RUE) and the light use efficiency (LUE) and correlation indices between the CASA model and ground data were determined. The results of this study (R2) showed that the accuracy of this model varies depending on the type of climatic regions (R2 = 0.80 to R2 = 0.15). In different climatic regions, the rate of NPP changes (very humid 68 gC/m2 to ultra-dry 15 gC/m2) varies in rangeland types. The highest rate of vegetation production is observed seasonally in May. Degradation conditions also reduced RUE and LUE. However, in hyper-arid regions, adaptations of plants in some different species (Hammada Spp.) increase their efficiency compared to other vegetation types. The results showed the importance of vegetation and climate classification in vegetation production studies.
Asunto(s)
Clima , Modelos Teóricos , Irán , Imágenes Satelitales , Lluvia , Desarrollo de la Planta , LuzRESUMEN
The purpose of this project is to evaluate the suitability of different sites as locations for obtaining underground water for consumption. The analysis of ²³8U, ²³²Th and 4°K from rock samples from each layer of borehole at a depth of â¼50 m at Site A borehole, S3L1-S3L6 in Gosa and 40 m at Site B borehole, S4L1-S4L5 in Lugbe, Abuja, north central Nigeria is presented. The gamma-ray spectrometry was carried out using a high-purity germanium detector coupled to a computer-based high-resolution multichannel analyzer. The activity concentrations at Site A borehole for ²³8U have a mean value of 26 ± 3, ranging from 23 ± 2 to 30 ± 3 Bq kg⻹, ²³²Th a mean value of 63 ± 5, ranging from 48 ± 4 to 76 ± 6 Bq kg⻹ and 4°K a mean value of 573 ± 72, ranging from 437 ± 56 to 821 ± 60 Bq kg⻹. The activity concentrations at Site B borehole for ²³8U have a mean value of 20 ± 2, ranging from 16 ± 2 to 23 ± 2 Bq kg⻹, ²³²Th a mean value of 46 ± 4, ranging from 43 ± 4 to 49 ± 4 Bq kg⻹, 4°K a mean value of 915 ± 116 and ranging from 817 ± 103 Bq kg⻹ to 1011 ± 128 Bq kg⻹. It is noted that the higher activity concentrations of ²³²Th and ²³8U are found in Site A at Gosa. Site B has lower radioactivity, and it is recommended that both sites are suitable for underground water consumption.