4 research outputs found

    北方季风边缘区洞穴石笋δ~(18)O序列预测初步研究

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    基于时域组合模型建立了中国北方季风边缘区万象洞及黄爷洞石笋&delta;~(18)O时间序列的动态模型,并对未来20年的降水变化趋势进行了预测。研究结果表明,时域组合模型较好地提取了时间序列的周期信息,用其拟合实测数据精度较高;用其预测时间序列的变化情况,和现代气象观测记录相吻合,具有一定的可信度。同时通过中国北方季风边缘区树轮的预测结果对比显示,该地区在2012~2013年前后降水最少,随后20年里将呈现先升后降的变化趋势。</p

    云南3种有色泡核桃仁营养成分 及仁衣中多酚类物质分析Analysis of nutritional components in kernels and polyphenols in coat of three colored Juglans sigillata in Yunnan

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    为促进云南核桃品种选育和深加工产品研发,对‘娘青’‘宣红’和‘紫金’3种云南有色泡核桃仁的基本营养成分、矿物质元素、脂肪酸组成及仁衣中多酚类物质含量进行测定 。结果表明:3种有色泡核桃仁中均含有大量的脂肪、碳水化合物和蛋白质,含量分别为58.2~59.6、18.9~199、15.4~16.4 g/100 g,均检测出2种维生素,其中维生素C以‘娘青’中含量最高,为17.9 mg/100 g,维生素E以‘宣红’含量最高,达19.2 mg/100 g;检出的6种矿物质元素中,常量元素Ca和微量元素Fe含量均以‘紫金’最高,分别为8 718.6、224.6 μg/g;3种核桃仁共检出21种脂肪酸,其中11种为不饱和脂肪酸,主要为亚油酸,以‘紫金’中的含量最高,为67.49%;3种核桃仁衣中均检测出7种多酚类物质,‘紫金’中含量最高,其次为‘宣红’,‘娘青’最低。综上,3种云南有色泡核桃仁均具丰富的营养组分,开发价值较高。 In order to promote the variety breeding and the deep processing products research of walnut varieties in Yunnan, the content of basic nutrients, mineral elements, fatty acids composition in the kernels and polyphenols in kernel coat of three colored Juglans sigillata Niangqing, Xuanhong and Zijin in Yunnan were determined. The results showed that the contents of fat, carbohydrate and protein in three colored Juglans sigillata were 58.2-59.6, 18.9-19.9 g/100 g and 15.4-16.4 g/100 g, respectively. Two kinds of vitamins were detected, among which the content of vitamin C was the highest in Niangqing(17.9 mg/100 g), and the content of vitamin E was the highest in Xuanhong(19.2 mg/100 g). Among the six mineral elements detected, the content of the macroelement Ca and the trace element Fe were the highest in Zijin, which were 8 718.6 μg/g and 224.6 μg/g, respectively. A total of 21 fatty acids were detected in the kernels of three colored Juglans sigillata, 11 of which were unsaturated fatty acids, mainly linoleic acid. The linolenic acid content in Zijing was the highest (67.49%). Seven kinds of polyphenols were detected in the three colored Juglans sigillata kernel coats. In terms of the content of seven polyphenols, Zijin was the highest, followed by Xuanhong, and Niangqing was the lowest. In conclusion, the kernels of the three colored Juglans sigillata in Yunnan are rich in nutritional components and have high development value

    全球季风动力学与气候变化

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    本文结合现代季风和古季风研究成果对全球季风进行了一个全面回顾,并引入了一个 全球季风的新定义,该定义考虑了三维分布、终极成因,强调了季节性气压梯度变化对季风环 流的影响,并同时使用了环流与降水来描述季风强度。我们在从构造到季节内的宽广时间尺度 上来考察全球季风气候变化。全球季风的性质包括全球不均一性、区域差异性、季节性、准周 期性、不规则性、不稳定性和穿时性。对全球季风动力学来说,太阳辐射、地球轨道参数、下 垫面性质和海 - 陆 - 气相互作用十分重要。本文还讨论了季风变率在不同时间尺度上的主要驱动 因子以及多时间尺度之间的动力学关系。自然过程与人类活动影响对我们理解未来全球季风行 为都非常重要。</p

    白鹤停歇与越冬生态学研究现状及展望

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    白鹤(Grus leucogeranus)为国家Ⅰ级重点保护动物及IUCN极危(CR)物种,野外种群数量4 000只左右。江西鄱阳湖是全球白鹤最主要的越冬地,几乎全球整个白鹤种群(超过99%)在该区域越冬。学者研究显示:气候、水位、生境类型、人为干扰等因素会对白鹤停歇地及越冬地的种群数量、活动节律、食性等产生影响。白鹤春秋迁徙期会以不同的策略,沿着相似的路线迁徙,具有一定的专一性。白鹤以植物性食物为主,对栖息地有选择偏好。近年来,人工生境成为白鹤重要的觅食越冬地。本文在总结前人的研究基础上,提出了一些白鹤保护措施及研究展望
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