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Stunty rice plants commonly grown in the fields of mountainous regions of northern Fujian were carefully investigated for the cause in this paper. Characteristics of this physiological malady and its distribution were studied. Reasons of its formations were summarized in final systematic types,The aim of this investigation is to supply valuable experimental data to check this physiological malady with a fundamental idea of promoting high rice yield ecosystem in northern Fujian,as well as protecting the rice-growing...

Stunty rice plants commonly grown in the fields of mountainous regions of northern Fujian were carefully investigated for the cause in this paper. Characteristics of this physiological malady and its distribution were studied. Reasons of its formations were summarized in final systematic types,The aim of this investigation is to supply valuable experimental data to check this physiological malady with a fundamental idea of promoting high rice yield ecosystem in northern Fujian,as well as protecting the rice-growing industry in such regions. Results reveal that “Stunty green rice model” is due to deficiency of available phosphorus,and “Stunty yellow rice model” is due to deficiency of available sulfur,nitrogen or low temperature stress of the air as well as the earth.Such types of malady are resulted from characteristic topographic cnvironments-soils-land utilization and management systems.According to analysis of sporadic rate,wide sporadic rate,and great covering areas of rice plants,they have the peculiarities of wide distribution and complex origins.The combination of the stress is not only complicated but also universal in occurrence.In northern Fujian,such defective rice fields come from cold stress of low air and soil temperature,deficient mineral elements, toxic elements and destruction of soil ecological balance.Thus they lead to the physical abnormality of soil media,defects of available soil water, soil temperature,and nutritional status.Soil carbon nitrogen,phosphorus, sulfur as well as other mineral contents and their relative amounts are in disoroder.The results of such conditions come from complicated interactions of environmental dificiencies of light and temperature together with available water defects.Thus the improper utilization and management of land accelerate the barrenness of the soil,leading to stunting.From various aspects,the authors assumed a system of stunting field classification.They form two main groups,with four subtypes and eleven sorts or species. Mixed curative methods were presented recommending the main procedures as well as emergency measures.

本文探讨了长期存在于闽北山区的一群病态稻田——发僵田的障害实质;发生分布特征及形成因素;最后总结阐明了有关其障害机制类型简明系统。本文的研究目的是为这类病田的正确施治提供实验根据,而其实际意义还涉及闽北高产稻田生态系统的创造与维护。研究结果表明,闽北稻绿型发僵是由土壤缺少有效磷,而稻黄型发僵是由土壤缺少有效硫、氮或强烈冷害引起的;这类病田是特球的地域性环境——土壤——土地利用管理体系作用下的必然产物。据发生片率(频率)、面率及成片度的调查分析,它们具有分布广泛而发生类型复杂特点,从而揭示了这类病田在闽北有着特别广泛的发生因素和复杂的障害组合。此类稻田对水稻生长的障害,可概括为存在于环境——土壤中的冷障、缺素与毒质的作用,及正常土壤生态平衡之破坏。有关后者的重要情况是土壤基质物理、水热状况和营养化学性质有严重缺陷,尤其是土壤碳、氮、磷和硫的含量和比值的失常。这一状态的产生根源是环境光热不足,水文状况复杂,土壤普遍贫瘠化;而落后的农田利用管理是其强有力的促成因素和稻发僵的“导火线”。作者根据各方面研究结果而拟订的僵田分类系统,包括了两大类四个亚型共11种。在最后总结中指出了综合施治的基础、中心环节及应急措施。

Based on the relation betWeen shear-ave velocity of meditun and phase-velocityo f Rayleigh wave in homogenous half-space, the media at all layers in depthsaffected by surfaCe wave with a certain frequency are homogenized, making it aequivalent homogenous half-space. On the precise of homogenization, a model isused to be forward solution in order to determine the relation between explorationdepth and wave length of surface wave. A phase-matChed filtering tecboque isaPPlied to isolate fundamental Rayleigh wave...

Based on the relation betWeen shear-ave velocity of meditun and phase-velocityo f Rayleigh wave in homogenous half-space, the media at all layers in depthsaffected by surfaCe wave with a certain frequency are homogenized, making it aequivalent homogenous half-space. On the precise of homogenization, a model isused to be forward solution in order to determine the relation between explorationdepth and wave length of surface wave. A phase-matChed filtering tecboque isaPPlied to isolate fundamental Rayleigh wave from observed signals. Frommulti-filtering and superposition processes, the dispersions of fundamental s~ewave and group velocity in 5.0-30.0Hz are precisely calculated. Using homogenizedtechique, a primary inversion model is obtained from dispersion curves of phasevelocity. The shear-wave velocity structures at all soil layers above 35m are obtainedby inversions of dispersions of group velocity. The restilts show that the inversionsare better coincident with data of drills.

根据均匀半空间Rayleigh波相速度与介质剪切波速度之间的关系,对某一频率面波的影响深度内各层介质进行"均匀"化,使其等效于均匀半空间.并利用模型进行正演,以确定在这种均匀化的前提下,面波勘探深度与波长的关系.应用相匹配滤波技术从实测面波信号中分离出基阶Rayleigh波信号,对它进行多重滤波和叠加处理,精确地计算出5.0-30.0Hz之间的基阶面波相、群速度频散.使用"均匀"化的方法,从相速度频散曲线中获得反演的初始模型,利用群速度频散反演得到35m以上各土层的剪切波速度结构.结果表明,反演结果与钻孔资料较为吻合

 
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