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?о???1996??2005??????????52????С?????????????6????????????????????????????????????????????????????????????P???????NW????300??320???????У??????????????????????????????????????????????????????????????????????????????????仯?????????????????????????????????????NNW????????????總?????????????NWW????EW????     

Soil evolution features of debris flow waste-shoal land

The reclamation and utilization of debris flow waste-shoal land plays an important role in the mitigation and control of debris flow hazards, which thus contributes a lot to the exploitation of insufficient land resources in mountainous areas and the reduction of losses caused by debris flow. The aim of this paper is to discuss the features and mechanism of soil evolution of debris flow waste-shoal land so as to search for the available modes of its reclamation and utilization. The Jiangjiagou Ravine, a typical debris flow ravine, was selected to study soil evolution features of debris flow waste-shoal land based on the analysis of soil physieochemical properties and soil microstructure. It was found that the soil evolution rates of debris flow waste-shoal land varied with different modes of reclamation. For the land which had been reclaimed for less than lO years, soil evolved most rapidly in paddy fields, and more rapidly in dry farmland than in naturally restored waste-shoal land. For the land which had been used for more than lo years, the soil evolution rates of dry farmland, naturally restored waste-shoal land and paddy farmland decreased in the file. For the same utilization period of time, significant differences were recognized in soil evolution features under different modes of reclamation. Analysis data showed that soil clay content, soil thickness, the psephicity of skeleton particles and contents of microaggregates （〈0.02 mm） in paddy farmland were all highest. Soil nutrients and porosity of dry farmland were better than those of paddy farmland and naturally restored waste-shoal land, and those of paddy farmland were superior to those of naturally restored waste-shoal land. Paddy farmland characterized by rapid pedogenesis, stable evolution and high utilizability was the priority candidate for the reclamation and utilization of debris flow waste -shoal land.     

长营岭—龙门冲原生晕异常及找矿预测

通过对珊瑚矿田长营岭－龙门冲地区岩石地球化学测量,圈定了该区Ｗ、Ｓｎ、Ｃｕ、Ｚｎ、Ａｓ、Ｂ、Ｆ等元素异常,原生晕严格受ＮＥ和ＮＷ两组断裂控制。综合评价认为处于长营岭钨锡矿带南延带的南风井多元素组合异常是矿异常,该异常明显地受ＮＥ（Ｆ９）断裂和ＮＷ（Ｆ１０）断裂控制,浓集中心位于Ｆ９断裂下盘,与长营岭矿区矿体在ＮＷ断裂下盘富集的规律相同。测区内,异常形态与北区具连续性,异常强度弱于北区,组分分带显示以隐伏花岗岩为成矿中心,但沿矿带由ＮＥ到ＳＷ并无明显的组分分带和元素组合变化,矿田内不仅矿带南延并向ＳＷ方向倾伏,而且很有可能深部隐伏花岗岩体亦分枝向南延伸。     

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曲线拟合法在山东流动重力资料处理中的应用

利用曲线拟合法对山东流动重力部分具有趋势性变化的异常测点进行了拟合改正,获取更可靠的重力变化信息,并对趋势性变化显著的测点进行了分析和讨论。     

神木气田二叠系气藏有利区预测

神木气田二叠系储层以低孔、致密为特征,非均质性强,气田开发产能较低、开发难度大.在细分层系的基础上,研究沉积砂体和有效砂体空间展布特征,明确太原组、山西组沉积相类型,以及沉积作用是储层发育的主导因素;综合考虑沉积特征、储层发育程度和试气成果等,明确神木气田的主力层位,以太原组、山2段和山1段为3个单元,进行有利开发区块的优选,优选Ⅰ类有利区块8块,推荐叠合有利区.结果表明:在优选有利区内钻井开发效果好,以苏里格气田标准进行衡量Ⅰ+Ⅱ类井比例达到78%,神木气田分层系、优选有利区的开发思路正确,优选有利区准确,对气田产能建设起到促进作用.     

湛江地区辣椒地土壤的养分状况及其调节

对湛江地区辣椒地土壤取样,测定了容重pH、及有机质、全氮、碱解氮、速效磷、速效钾含量。结果表明,辣椒地土壤肥力比甘蔗地土壤有明显改善,且随年限延长呈提高的趋势;与甘蔗地土壤比较,辣椒地土壤速效钾含量呈降低趋势。