西畴县近48年来降水及气温小波分析

利用连续小波分析1962～2009年西畴县年降水量和年平均气温序列的小波变化特征,揭示了西畴县降水量与平均气温存在多时间尺度的周期变化特征。其中降水有2个明显的特征时间尺度,分别是4年和8年,平均气温存在以准2～4年为周期的周期振荡。此外,也可以看出近48年来,平均气温存在明显升高的趋势,降水也有减少的趋势,为掌握西畴县的气候变化规律及今后的气象预报服务工作提供了一定的参考价值。     

基于GIS／RS的西畴县法斗乡土地利用变化研究

随着科学技术的发展,遥感技术运用到土地利用管理中,能够快速提取土地利用变化信息,同时地理信息技术（GIS）迅猛发展,基于这两种技术结合起来探测土地资源的变化具有重要的现实意义。因此,在GIS平台支持下,将土地利用变化分析结果用于土地利用更新从而得到更新后的土地利用现状图。并根据土地利用面积变化、类型等方面对项目区进行了定性定量研究。根据土地利用变化情况以及土地利用各类型之间的相互转换状况,建立了土地利用类型转换矩阵并根据项目区实际情况提出了在石漠化地区生态效益恢复的建议及对策。     

西畴县灾害性天气预报经验

统计西畴县近30年的大雨、暴雨、冰雹等灾害性天气时空分布情况,查阅历年预报会商分析记录和实况天气回顾,找出了造成这类天气的实际影响系统,归纳出该县的四季天气特点、主要气象灾害和主要影响天气系统,着重讨论形成西畴县冰雹、大雨、暴雨天气的典型环流形势和其它影响因子。对形成西畴县冰雹、大雨、暴雨等灾害性天气预报进行经验总结。     

云南西畴县嘎机铅锌矿特征及找矿标志

云南西畴县嘎机铅锌矿处于都龙复式花岗岩基向北侧伏的地带,铅锌矿体主要呈似层状赋存于构造破碎带中,该铅锌矿具有层控-岩浆期后热液矿床的特征。中寒武统田蓬组(∈2t)碳酸盐岩-碎屑岩互层组合、背斜构造、隐伏花岗岩体脊状凸出部位、矽卡岩化围岩蚀变和物、化探异常等是本区的主要找矿标志。     

Soil erosion and its basic characteristics at karst rocky-desertified land consolidation area: A case study at Muzhe Village of Xichou County in Southeast Yunnan,China

Xichou County of Wenshan Zhuang and Miao Autonomous Prefecture in southeast Yunnan is one of the karst mountainous areas in southwest China showing typical rock desertification. During this study, we set up three soil erosion contrast test spots at Muzhe Village, Benggu Township, Xichou County, which was the birthplace of the Xichou rock-desertified land consolidation mode. The three spots included the terrace land spot (already consolidated land), sloping land spot (unconsolidated sloping land under rock desertification), and standard runoff spot (bare land spot). In 2007, a whole-year complete observation was conducted during the rainy season and "rainfall-erosion" data were obtained for 32 times. Our analysis showed that during the entire observation period, the number of the rainfalls that led to soil erosion accounted for 34.04% of the number of all rainfalls and the amount of the rainfalls that led to soil erosion accounted for 84.17% of the total amount of all rainfalls. The average erosive rainfall standard in the three test spots was 11.0 mm, slightly higher than the 10 mm standard that has been adopted all over China, but lower than the 12.7 mm standard of the US and the 13.0 mm standard of Japan. According to single-factor analysis, the soil loss in the sloping land spot (L2) and that in the bare land spot (L3) are correlated to certain extent to many other factors, including the single precipitation (P), rainfall intensity during the maximum ten minutes (I10), rainfall intensity during the maximum 20 minutes (I20), rainfall intensity during the maximum 30 minutes (I30), rainfall intensity during the maximum 40 minutes (I40), and rainfall intensity during the maximum 60 minutes (I60). Among these factors, they are of the highest relativity with I60. According to double-factor analysis, both L2 and L3 are of good relativity with P and I60. According to multi-factor analysis, L2 and L3 are also of good relativity with seven rainfall indexes, namely, P, Ia (average rainfall intensity), I10, I20, I30, I40, and I60, with their related coefficient R reaching 0.906 and 0.914, respectively. The annual soil losses in the three test spots are widely different: 1030.70 t/km2·a in the terrace land spot, which indicates a low-level erosion; 12913.22 t/km2·a in the sloping land spot (unconsolidated spot), some 12.5 times than that in the terrace land spot, which indicates an ultra-high-level erosion; and 19511.67 t/km2·a in the bare land spot, some 18.9 times than that in terrace land spot, indicating an acute erosion. These figures fully show that the Xichou rock-desertified land consolidation mode plays a significant role in soil conservation.     

云南西畴荒田矿区萤石白钨矿地质特征及成因初探

西畴县荒田萤石钨矿床为滇东南锡锌多金属成矿带重要组成部分,矿体呈似层状、透镜状,贮存于寒武系中统龙哈组碎裂岩中,受推覆-滑脱构造控制,以中低温矿化蚀变为主。根据矿床成矿地质背景和矿床地质特征,认为该矿床是受地层、推覆构造、热液等多因素控制的岩浆热液矿床。