| 1. | Experimental study of yearly change of soil water infiltration characteristics
土壤水分入渗年变化特性的试验研究 |
| 2. | Two - dimensional numerical simulation of soil water infiltration under bed - irrigating sowing
坐水播种时耕层土壤水分入渗的二维数值模拟 |
| 3. | Soil water infiltration capacities and parameters of soil water infiltration model make severe change in agriculture productive period , but have definite change law as well
土壤水分入渗能力与土壤水分入渗模型参数在农业生产周期内发生剧烈变化，但也有一定的变化规律。 |
| 4. | Soil water infiltration is aimportant link in nature water cycle , study on soil water infiltration may make sure reasonably farmland irrigation technical parameter to offer science reference
土壤水分入渗是自然界水循环中的一个重要环节，土壤水分入渗问题的研究，可为合理确定农田灌溉技术参数提供科学依据。 |
| 5. | Factors which influence field soil water infiltration characteristics have soil structure , soil moisture , soil texture , topsoil crusting and plate , agriculture husbandry measure and soil water phase change and so on
影响大田土壤水分入渗特性的因素有：土壤结构、土壤含水量、土壤质地、表土结皮和板结、农业耕作措施和土壤水的相变等。 |
| 6. | Because these factors make change more often , soil time space variability is more bigger . the relationship of single factor between soil water infiltration capacities and certain influencing factor could be established quantitatively by means of soil water infiltration tests in indoor , there is negative correlation relation between soil water infiltration capacities and soil structure . there is negative correlation relation in high grit content and low physical clay content soil , and second - degree polynomial relation in high physical clay content junk structural soil between soil water infiltration capacities and soil moisture
由于这些因素在时刻发生变化，使得土壤的时空变异性较大，只能用室内土壤水分入渗试验来定量确定土壤水分入渗能力与某些影响因素之间的单因子相关关系，土壤水分入渗能力与土壤结构之间呈负相关关系，土壤水分入渗能力与土壤含水量之间在土壤砂粒含量高，物理性粘粒含量低的无结构土壤中呈负相关关系，在物理性粘粒含量高的团粒结构土壤中呈二次多项式关系。 |
| 7. | Soil nitrogen pool is the main body of terrestrial carbon pools , so it ' s change will possibly result in relatively great change of atmosphere n2o concentration , and , it ' s change will also affect global climate change . meanwhile , the nitrogen in the soil can also cause the water pollution through soil water infiltration and surface runoff
作为陆地氮库的主体，土壤氮库的微小变化，可能导致大气n _ 2o浓度发生较大的变化，以至影响全球气候变化；同时土壤中的氮素也可以通过下渗和地表径流等方式流入水体，导致水体污染。 |
| 8. | The changing procedure of soil water infiltration capacities is in keeping with second - degree polynomial change functions in cornfield , sesame field and fallow field and with quartic - degree polynomial change functions in wheat field in unfrozen phase , the changing process of soil water infiltration capacities suit second - degree polynomial change functions in various husbandry condition in frozen phase
在非冻结期，玉米地、芝麻地和休闲地的土壤水分入渗能力的变化过程符合二次多项式变化规律，小麦地的土壤水分入渗能力符合四次多项式变化规律；在冻结期，无论是哪种耕作条件土壤水分入渗能力符合二次多项式变化规律。 |
| 9. | The rate of contribution of various edaphic physical parameters is different from parameter of soil water infiltration model in different soil texture and husbandry condition , so independent variable factor and priority are different in regression models . the predicted results are satisfactory in correlation husbandry condition
在不同的土壤质地和不同的耕作条件下，土壤的各种物理参数对土壤的水分入渗模型参数影响程度不同，因此引入到回归模型中的自变量因子不同，引入的先后次序不同。 |
| 10. | In this paper , based on the soil water infiltration multifactorial influence tests with three species of soil texture and different husbandry condition and monofactorial influence tests with four species of soil texture in indoor , the basic infiltration characteristics , reduction infiltration mechanism and various factors are studied systematically . major factors influencing soil infiltration characteristics , resilience between influence factors and soil water infiltration parameter and influence priority are analyzed by mathematics statistics method , stepwise regression models with multiple units of soil water infiltration parameters are build up and verified
本文基于大田三种质地、不同耕作条件下土壤水分入渗的多因素影响试验和室内四种质地土壤条件下的单因素影响试验，系统地研究了土壤水分入渗特性的变化过程，阻渗机理和影响土壤水分入渗特性的各种因素，借助数理统计方法分析影响土壤水分入渗特性的主要因素，各影响因素与土壤水分入渗参数间的相关性及其影响的先后次序。建立、验证了土壤水分入渗参数的多元逐步回归模型。 |
