Years In South China Research Articles

Sugar-Sweetened Beverages Consumption Positively Associated with the Risks of Obesity and Hypertriglyceridemia Among Children Aged 7-18 Years in South China.

Aims: Excessive consumption of sugar-sweetened beverages (SSBs) may increase the prevalence of obesity and other metabolic risk factors. However, data regarding the relationship between SSB consumption and metabolic risk factors are insufficient in Chinese children. Hence, we aimed to explore the association between SSB consumption and cardio-metabolic risk factors in children aged 7–18 years living in South China.Methods: A cross-sectional study was conducted in a total of 2,032 children aged 7–18 years were enrolled, including 1,013 boys and 1,019 girls. Based on a multistage cluster sampling, five elementary and four secondary schools in Guangzhou, China were included. Fasting blood glucose levels, lipid profiles, and anthropometric characteristics were evaluated. Information on demography, dietary, and physical activities were self-reported.Results: Overall, 34.7% participants were non-drinkers and 21.6% consumed more than 120 mL/day SSB. The body mass index (19.43 ± 0.18 kg/m2) and triglyceride concentration (0.96 ± 0.03 mmol/L) were higher and high-density lipoprotein concentration (1.32 ± 0.31 mmol/L) was lower in consumers than in non-consumers (all P < 0.001). Furthermore, in contrast to non-consumers, the adjusted odds ratio of SSB consumption more than 120 mL/day was 2.08 (95% CI: 1.21–3.54) for obesity, 1.83 (95% CI: 1.25–2.69) for abdominal obesity, and 1.70 (95% CI: 1.02–3.06) for hypertriglyceridemia in consumers.Conclusion: A positive association between SSB consumption and the risks of obesity and hypertriglyceridemia was observed in children living in South China, which suggests that high SSB consumption enhances the risk of cardio-metabolic risk factors and the consequent cardio-metabolic diseases.

Temporal Evolution of Carbon Storage in Chinese Tea Plantations from 1950 to 2010

Tea (Camellia sinensis), an economically important crop grown in mountain regions, has been planted for thousands of years in South China. Tea plantations can potentially act as carbon (C) sink in local agrosystems due to their high plant biomass and provide soil conservation service. To assess the contribution of tea plantations to C sequestration, the chronosequence variations of C storage were assessed in the plants and soils (0–20 cm) of tea plantations in China from 1950 to 2010, and then the inter–annual and decadal variabilities of total C storage were estimated. Total C stocks in tea plants and soils in 2010 were 34.4 and 93.45 Tg, respectively. Carbon sequestration from 1950 to 2010 was 30.6 and 39.0 Tg in the plants and soils, respectively. The highest C sequestration happened during the 1980s and the lowest during the 1950s. The decadal average C sequestration rate ranged from 20.4 to 113.9 g m−2 year−1 in the standing tea plants, and from 54.6 to 98.8 g m−2 year−1 in soils during the period of 1950 to 2010. The average ratio of C storage in soils to that in plants was 3.00 ± 0.35 before 1970 and 2.44 ± 0.18 after 1970. The results suggested that tea plantation ecosystems made an important contribution to the C sinks in Chinese tea–producing regions.

Relative validity of a 2‐day 24‐hour dietary recall compared with a 2‐day weighed dietary record among adults in South China

To determine the relative validity of a 2-day 24-hour dietary recall (HR) designed to assess energy and nutrient intake among Chinese adults compared with a 2-day weighed dietary record (WD). Data were obtained from an ongoing population-based, prospective cohort study of adults aged 18-65 years in South China. A total of 41 adults completing a HR and a WD within 14 days were included in the present analysis. Estimations of individual mean differences, Spearman's correlation coefficients, cross-classifications and Bland-Altman plots were used to assess the agreement between the intakes of energy and 18 nutrients obtained from the HR and the WD. With the exception of total fat, saturated fatty acids, thiamine, potassium and magnesium, the energy and nutrient intakes between the HR and WD showed no significant differences. All dietary intakes that were evaluated by the HR were correlated significantly with the dietary intake from the WD (de-attenuated correlation coefficients ranged from 0.10 to 0.87). The proportion of participants classified into quartiles correctly ranged from 61% for tocopherol intake to 90% for energy intake. The weighted k values ranking the participants ranged from 0.11 for tocopherol intake to 0.41 for the intakes of energy and calcium. The Bland-Altman plots showed moderate/good agreement among all the dietary intakes that were estimated from the HR and WD, except for total fat. This study suggests that an HR could be a valid tool for estimating the energy and nutrient intakes among adults in South China at the group level.

近50年华南气象干旱时空特征及其变化趋势

PDF HTML阅读 XML下载 导出引用 引用提醒 近50年华南气象干旱时空特征及其变化趋势 DOI: 10.5846/stxb201304120691 作者: 作者单位: 广东省气候中心,南京信息工程大学应用气象学院,广东省鹤山市气象局,广东省气候中心,广东省气候中心,广东省气候中心 作者简介: 通讯作者: 中图分类号: 基金项目: 公益性行业(气象)专项(GYHY201106021); 国家973计划(2013CB430206); 广东省科技计划(2012B020314006); 干旱气象科学研究基金(IAM201303) Temporal-spatial characteristics and its variation trend of meteorological drought in recent 50 years, South China Author: Affiliation: Guangdong Climate Center,,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用标准化前期降水指数(SAPI)和常年平均相对湿润度指数(M)构建的逐日气象干旱指数(DI),根据华南(广东、广西)174个气象站资料分析了近50年(1961-2010年)气象干旱时空特征及其气候变化趋势。结果表明:(1)华南近30年(1981-2010年)总旱日频率平均为26.0%,其中轻旱、中旱、重旱和特旱日分别为12.3%、8.1%、4.2%和1.4%。(2)各等级旱日频率具有非汛期(10月至次年3月)高于汛期(4月至9月)、广西高于广东的特征。(3)近50年华南最旱的5a依次为:1963、1991、2004、2009、1977。(4)气候变化趋势分析表明,1至9月降水和月干旱指数(MI)以增加趋势为主,各等级旱日数以减少趋势为主,其中7月份MI增加趋势及各等级旱日减少趋势均达到0.1显著水平;而10至12月降水和MI以减小趋势为主,各等级旱日数以增加趋势为主,其中11月份MI减小趋势及中旱、重旱、总旱日增加趋势均达到0.05显著水平。(5)年总旱日趋于增加、减少的站点数各占60%、40%,有11%的站点达到0.1以上显著水平。各等级旱日显著增加的站点大多集中在广西,而旱日显著减少的站点主要集中在广东,表明广西干旱总体上重于广东的格局可能进一步加剧。目的为进一步开展华南气候变化影响评估、水资源利用及应对气候变化提供基础。 Abstract:Using the daily meteorological drought indicator (DI) constructed by standardized antecedent precipitation index (SAPI) and year round average relative moisture index (M),based on meteorological data of 174 stations of South China (includes Guangdong and Guangxi Province), temporal and spatial characteristics and its variation trend of meteorological drought in recent 50 years in South China was analyzed in the paper. Main results are: (1) Recent 30 years (1981-2010) average drought days frequency of all levels in South China is 26.0%, where light, middle, severe and extreme drought days accounts for 12.3%, 8.1%, 4.2% and 1.4% respectively. (2) Drought days of each level in non-flood season (October to March) are more than flood season (April to September), and Guangxi is more than Guangdong. (3) The most dry 5 years in recent 50 years in South China are 1963, 1991, 2004, 2009 and 1977. (4)According to linear trends analysis, rainfall and monthly drought index (MI) from January to September mainly show increasing trend, and drought days of each level mainly show decreasing trend, where increasing trend of MI and decreasing trend of drought days of each level in July are statistically significant (α=0.1); while rainfall and MI from October to December mainly show decreasing trend, and drought days of each level mainly show increasing trends, where decreasing trend of MI and increasing trends of middle and severe drought days of November are statistically significant (α=0.05). (5)Stations of increasing and decreasing trends of annual drought days account for 60% and 40% respectively, where 11% stations are statistically significant over 0.1 level. Stations with statistically significant increasing trend of drought days of each levels are mostly in Guangxi Province, while stations with statistically significant decreasing trend of drought days are in Guangdong Province,indicating that the overall pattern that drought in Guangxi is more severe than in Guangdong may further aggravate in the future. The study can provide a base for further study on climate change evaluation, water resources utility and coping strategies of climate change as well. 参考文献 相似文献 引证文献

Co-creating evidence on obesity prevention implementation through case studies

Introduction: Studies of Western countries revealed that dietary carbohydrate seemed to be relevant to obesity. However, studies about the relevance of foods rich in carbohydrate among Chinese children on their body composition are lacking. Our aim was to investigate whether the consumption of grain and tubers is associated with body composition in Chinese children. Materials and methods: Cross-sectional valid data from 2006 children (52.3% boys) aged 7—18 years in South China were analysed. Weight, height and skinfold thickness were measured. Body mass index, body fat percentage (%BF), fat mass index (FMI) and fat free mass index (FFMI) were calculated. International Obesity Task Force (IOTF) criteria was used to define overweight and obesity. Based on food frequency questionnaire, the daily consumption of grain and tubers was calculated. Prevalence of overweight and obesity, %BF, FMI and FFMI were compared between low/median/high food consumption groups using chi-square tests or Wilcoxon signed rank tests for each age group, respectively. Results: %BF and FMI were higher in girls than those in boys. Boys (402.4 g/d) consumed more grain than girls (344.8 g/d) (p < 0.0001), and children aged 13—15 years consumed more grain than the other age groups. Similar associations were not observed for tubers. There was no significant difference of overweight/obesity prevalence between low/median/high food consumption groups. Among children aged 13—15 years, %BF, FMI and FFMI were significantly different between grain consumption groups (p < 0.0001), and children consumed the least servings of grain had highest %BF and FMI. Moreover, FMI and FFMI were significantly different between tubers consumption groups among 10—12 years group (p < 0.05). Conclusions: Among Chinese children, consumption of grain and tubers seems to be correlated with obesity, and this relevance is primarily for body composition among older children.

Cross-sectional association of grain and tubers with body composition among children and adolescents in South China

Introduction: Studies of Western countries revealed that dietary carbohydrate seemed to be relevant to obesity. However, studies about the relevance of foods rich in carbohydrate among Chinese children on their body composition are lacking. Our aim was to investigate whether the consumption of grain and tubers is associated with body composition in Chinese children. Materials and methods: Cross-sectional valid data from 2006 children (52.3% boys) aged 7—18 years in South China were analysed. Weight, height and skinfold thickness were measured. Body mass index, body fat percentage (%BF), fat mass index (FMI) and fat free mass index (FFMI) were calculated. International Obesity Task Force (IOTF) criteria was used to define overweight and obesity. Based on food frequency questionnaire, the daily consumption of grain and tubers was calculated. Prevalence of overweight and obesity, %BF, FMI and FFMI were compared between low/median/high food consumption groups using chi-square tests or Wilcoxon signed rank tests for each age group, respectively. Results: %BF and FMI were higher in girls than those in boys. Boys (402.4 g/d) consumed more grain than girls (344.8 g/d) (p < 0.0001), and children aged 13—15 years consumed more grain than the other age groups. Similar associations were not observed for tubers. There was no significant difference of overweight/obesity prevalence between low/median/high food consumption groups. Among children aged 13—15 years, %BF, FMI and FFMI were significantly different between grain consumption groups (p < 0.0001), and children consumed the least servings of grain had highest %BF and FMI. Moreover, FMI and FFMI were significantly different between tubers consumption groups among 10—12 years group (p < 0.05). Conclusions: Among Chinese children, consumption of grain and tubers seems to be correlated with obesity, and this relevance is primarily for body composition among older children.

Humification degrees of a lacustrine sedimentary sequence as an indicator of past climatic changes in the last c. 49 000 years in South China

Zhong, W., Ma, Q. H., Xue, J. B., Zheng, Y. M., Cai, Y. &amp; Ou, Y. J. 2009: Humification degrees of a lacustrine sedimentary sequence as an indicator of past climatic changes in the last c. 49 000 years in South China. Boreas, 10.1111/j.1502‐3885.2009.00119.x. ISSN 0300‐9483.An 860 cm long sediment core recovered from Dahu Swamp was used to test the potential of the degree of humification (expressed as the corrected absorbance values, HDcab) of lacustrine sediments as an indicator of past climatic changes in South China. The chronological sequence of this core was established using 10 AMS 14C dates and 10 conventional 14C dates and gives the bottom age of c. 48 800 cal. yr BP. Based on comparisons with multiproxy records, such as lithological variation, organic carbon isotope ratio, organic matter content and dry bulk density, we infer that the HDcab record is sensitive to local hydrological variations that are closely related to the East Asian (EA) summer monsoon precipitation. Higher HDcab values would indicate relatively drier conditions, suggesting a weakening of the EA summer monsoon and vice versa. Based on the HDcab, as well as other multiproxies, the climatic history in the last c. 49 000 years in the swamp area shows agreement with the Chinese stalagmite record and with the 25°N summer solar insolation, implying that orbitally induced insolation may have played a role in the last glacial period (LGP) climate in South China. Several millennial‐scale dry phases during the LGP show similarities with the stadials revealed by the ice core record in Greenland and from the Chinese cave stalagmites. Our study demonstrates that the HDcab of lacustrine sediments is a useful proxy of past climatic changes in South China.

Changes of soil organic carbon and nitrogen in forage grass fields, citrus orchard and coniferous forests

Dynamic quantitative assessment of soil organic C and N is an available approach to understand the exact impact of land management on soils fertility. In this study the biomass of plants and content of soil organic C and N were compared in four typical land use systems which were planted with Ryegrass (Lolium multiflorum Lam.), Bahiagrass (Paspalum notatum Flugge.), Citrus (Citrus reticulata Blanco.), and Masson pine (Pinus Massoniana Lamb.) during 10 years in south China. Although biomass of plants in these four land use systems was nearly at the same level in the former investigation, total biomass for Ryegrass (RG), Bahiagrass (BG) was 3.68 and 3.75 times higher than that for Citrus (CT), and 2.06 and 2.14 times higher than that for Masson pine (MP) over 10 years of cultivation, respectively. Especially, underground total biomass for both RG and BG was over 10 times larger than that for CT and MP, indicating that forage grasses was much more beneficial to increase organic C and N storage in soils than CT and MP. The change content of soil organic C and N mainly occurred within soil depth of the 0–40 cm. The increased content of soil organic carbon and nitrogen was for 1.5 t·hm−2 and 0.2 t·hm−2 in the soil with planting RG and BG, and was for 1.2 t·hm−2 and 0.02 t·hm−2 in the soil with planting CT. An average loss was for 0.4 t·hm−2 and 0.04 t·hm−2 in the soil with planting MP during 10-year period.