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    After treated with different concentrations of test pesticides, the population growth curves were all sigmoid, and accorded well with Logistic model (R2>0.8).
    不同农药不同浓度处理下,草履虫密度增长曲线均具有“S”型生长特点; 农药胁迫下草履虫密度增长曲线符合Logistic模型(R2>0.8),3种农药胁迫下K值明显降低;
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    Validation and Calibration of Land Production Simulation Model(PS123)
    土地生产力模型(PS123)的校正和验证
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    The Application of World Food Study Model(WOFOST) for Yield Prediction in Heilongjiang Province
    世界粮食研究模型在黑龙江省作物产量预报中的应用
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    Through GIS model (CLUE_CH), this article investigated the arable land use change and its spatial characteristics.
    通过 GIS模型 (CL U E_ CH) ,探讨了我国耕地变化及其空间分布特征。
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    (2) a one component, first order exponential model (one pool model);
    (2 )一级反应式 (One pool模型 ) ;
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    The simulation result of SCNC model (Soil Carbon and Nitrogen Cycle ) showed the content of soil organic carbon could increase by 8.3-18.9g/ kg and the increasing ratio was up to 62.0 %-140.7 % after 50 years with organic residue cycling in red paddy system.
    预测结果显示,有机物料循环再利用土壤有机碳50年内可提高8.3~18.9 g/kg,增长率达到62.0%~140.7%。
    The manpower and chemical fertilizer are the major parts among the economic input, which takes 45.6% and 22.8% seperately, owing to the high utilization ratio of land (the multiple crop area was 307%) and multiplantingraise model( the dikepond system was 30% in total cultivated area).
    其中人力和化肥投入分别占经济投入的45.6% 和22.8% ,这与充分利用耕地(复种指数达307% )和多样化种养模式(基塘系统占总耕地30% )是分不开的。
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    STUDIES ON ECOLOGICAL EFFECTS OF A SPACE PLANTING AND FEEDING MODEL (RICE+FISH+DUCK) IN PADDY FIELD
    稻鸭鱼种养模式的生态效应研究
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    Key Technique for Establishing Digital Elevation Model (DEM) at Provincial Scale ——Case Study of Jiangsu Province
    建立省级数字高程模型(DEM)的关键技术——以江苏省为例
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    according to Digital Elevation Model( DEM), Remote Sensing ( TM, IKNOS or QUICKBIRDS), land to make use of the present condition diagram, combination open country to investigate, Make the yellow river water and soil conservation ecosystem engineering Zhengzhou Mang mountain ecosystem park item area the soil to erode the type and strength to distribute figure .
    依据数字高程模型(DEM),遥感影像(TM、IKNOS或QUICKBIRDS)土地利用现状图,结合野外调查验证,制作出黄河水土保持生态工程郑州邙山生态园项目区土壤侵蚀类型及强度分布图。
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Reductive group actions on affine quadrics with 1-dimensional quotient: Linearization when a linear model exists
      
A linear model for a given action is a linear orthogonal action with the same orbit types and equivalent slice representations.
      
We prove that if a reductive group action on an affine quadric with a 1-dimensional quotient has a linear model, then the action is linearizable.
      
Using the path model and the theory of crystals, we generalize the concept of patterns to arbitrary complex semi-simple algebraic groups.
      
In the model situationD is the Siegel disc,S is the manifold of Lagrangian subspaces andG is the symplectic group.
      
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Mechanical properties of soil including resistance to pressure, shearing, and deformation, internal pressure in relation to soil moisture content were studied with model experiment of paddy soils in rice stubble field and in wheat stubble field under laboratory condition. The mechanical strength of paddy soil in rice stubble field changed greatly with changing soil moisture content.This is due to a rapid development of attraction of molecular resulting from intensive shrinkage. Paddy soils in wheat stubble...

Mechanical properties of soil including resistance to pressure, shearing, and deformation, internal pressure in relation to soil moisture content were studied with model experiment of paddy soils in rice stubble field and in wheat stubble field under laboratory condition. The mechanical strength of paddy soil in rice stubble field changed greatly with changing soil moisture content.This is due to a rapid development of attraction of molecular resulting from intensive shrinkage. Paddy soils in wheat stubble field, however, were found to show less change in this respect. When soil moisture content was high, the internal friction of clay soil approached zero. Its shearing strength was effected by soil cohesion only and its internal friction increased with the change of texture from heavy to light. When soil moisture content dropped, the internal friction of all the soils studied increased rapidly and was effected by the strength of aggregates and the degree of roughness of the shearing surfaces. When soil moisture dropped to the lower part of plasticity, fragility of soil began to occur, but a certain degree of plasticity and viscosity still remained. Fragility may occur at high content of soil moisture to soils with light texture and weak arrangement. As the change of a soil from plastic to solid is a continuous process, a larger range of soil moisture content should be allowed for the demarcation between a plastic and a solid soil. Since the internal pressure of the paddy soil in rice stubble field increased rapidly upon decrease of soil moisture content, especially so in the case of clay paddy soil. Hence, for cultivation on such soils a higher optimum soil moisture content is suggested for the main purpose of tillage and to minimize soil plasticity and viscosity. On account of this, it is necessary to have the plow to form soil blocks of smaller primary shear planes, to have a higher speed of plowing, to have the land plowed twice, first far in advance of planting and then immediately before planting, and to have a larger contact surface between soil and tire so as to increase the draft force of the tractor.

在实验室条件下,模拟稻茬和麦茬两种土壤状况,研究了抗机械强度、变形性质和内压力三者与土壤含水量的关系。稻茬田土壤抗机械强度随含水量变化的曲线的坡度很大,麦茬田则较小。前者因强烈收缩使分子引力很快发展之故。粘质土壤的内摩擦力,在含水量大时接近于零,抗剪强度只决定于内聚力,质地变轻内摩擦力微有呈现。含水量降低各种土壤内摩擦力增加快,并受土壤剪断面的粗糙度和团聚体强度所影响。土壤含水量降低到塑性下部,土壤脆性开始形成,但仍有一定的塑性和粘滞性,土壤质地变轻及垒结疏松时,土壤的脆性能够在更高的含水量范围内产生。土壤塑性体与固体的转变是渐次过渡的,所以二者的分界应是一个较大的湿度范围。稻茬田土壤含水量降低内压力增加很快,特别是粘质水稻土。所以我们认为水稻土耕作时湿度不宜过低,克服水稻土的塑性和粘滞性是耕作上的首要任务。为此,犁要能使土壤形成较小的初剪面土块,耕速要大,在播种期前先耕翻,并于播种时复耕。同时为发挥机具的曳引力,其行走部分与土壤的接触面积宜大。

In this paper,the physical-based Green-Ampt(1911)infiltration equation is modified.Its moisture physical parameters are substituted with several common hydrological parameters,and hence a semi-theoretical and semi-empirical infiltration equation is given.By analyzing the rainfall and runoff of the Tuanshankou catchment of North Shanxi Province(area,0.18 square Killometers),several quantified parameters are given to this infiltration equation.An unsteady rain intensity and distributed model infiltration...

In this paper,the physical-based Green-Ampt(1911)infiltration equation is modified.Its moisture physical parameters are substituted with several common hydrological parameters,and hence a semi-theoretical and semi-empirical infiltration equation is given.By analyzing the rainfall and runoff of the Tuanshankou catchment of North Shanxi Province(area,0.18 square Killometers),several quantified parameters are given to this infiltration equation.An unsteady rain intensity and distributed model infiltration procedures are used for analyzing the runoff generatiort of maximum flood which was measured at the Zabakou catchment(area,187 square killometers).Good results have been obtained by demonstration.

本文对格林——阿姆特(Green-Ampt,1911)物理入渗方程进行了改造,以几个常用的水文参数代换方程中的土壤水分物理参数,得到了半理论半经验的入渗方程;通过陕北团山沟流域(面积0.18平方公里)的暴雨径流分析,对半理论半经验入渗方程中参数予以定量。应用变雨强及分散性模型的入渗计算方法,对岔巴沟流域(面积187平方公里)实测最大洪水的暴雨进行了产流计算,验证结果良好。

This paper gives a preliminary analysis of field ecological system of the lu Jia wan Production Brigade at De Chin County and the Zong An Production Brigade at Tong Xiang County from the point of view of ecological balance on the basis of investigation.These two productive brigades are both located on Hang Jia Hu area at the northern parts of Zhejiang province.Field crop production,animal husbandry,silkworm raising and mulberry production,and fishery practised by the two brigades constitute a complex system...

This paper gives a preliminary analysis of field ecological system of the lu Jia wan Production Brigade at De Chin County and the Zong An Production Brigade at Tong Xiang County from the point of view of ecological balance on the basis of investigation.These two productive brigades are both located on Hang Jia Hu area at the northern parts of Zhejiang province.Field crop production,animal husbandry,silkworm raising and mulberry production,and fishery practised by the two brigades constitute a complex system of energy transformation and material circulation,and form a comparably rational ecological balance.This balance guarantees the increase of agricultural productivity and the realization of an yearly average production of over 1,000 kg per mu,with 7-8 years of stable and high yield in succession.This system of agricultural production substantially carries out the good practice reasonably utilying the soil fertility and simultaneously maintaining and even enriching it.This could be confirmed by the organic matter and nitrogen circulation and the improvement of soil fertility.The agricultural system practised at both these two brigades is one of the models of the field ecological system in the canal networks of the plain region to arrive at an ecological balance.Although there are inperfective and inadequate,it surely has many good points,and undoubtedly it provide instructive experiences,that will be helpful in the planning of the cropping systems on the farms.Thus it is worthy of consideration.

本文在调查研究的基础上,以生态平衡的观点,对浙江北部杭嘉湖地区的德清县陆家湾大队与桐乡县众安大驮的农田生态系统作了初步分析。 这两个大队的大田作物生产、畜牧业、蚕桑业、渔业构成了一个复杂的能量转化和物质循环系统,形成了较为合理的生态平衡,从而保证了提高农业生产力,实现连续七、八年每年粮食平均亩产超过2000斤的持续稳产高产,并做到了用地与养地相结合。这可以从有机物质、氮素的循环和土壤肥力因素的改善得到证明。 这两个大队是平原水网地区农田生态系统生态平衡的一种模式,虽然它们还有不足之处,但确有很多优点和经验,能给我们启发,值得学习与提倡。

 
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