查询词典 field moisture capacity

Water stress experiments on Caryopteris mongholica Bunge of six provenances were conducted under three intensities selected by the provenance environments: mild, moderate and severe, of which the soil moisture were 80～85%, 45～50% and 15～20% of the field capacity respectively.

中文摘要：以6个种源的1年生蒙古莸为试验材料，采用称重控水的方法，根据种源地的情况设置充足水分、中度胁迫、重度胁迫3个水分梯度，分别维持在田间持水量的80～85%、45～50%、15～20%开展水分胁迫试验。

Cerasus humillis Bunge can adapt to the drought enviroment and insure it＇s＇ photosynthetic apparatus against light damage under the soil moisture of 55%- 60% field water capacity.

当土壤含水量维持在田间持水量的55％-60％时，欧李尚能适应干旱环境而保证其光合机构免受光损伤。

Thereinto, drip irrigation is divided into three treatments of different ration. Tectorial and untectorial treatment are adopted to semifixation spray irrigation. At the same time, seepage-preventing trial is done. By study of one growth season, it shows that the indexes, Comparing with flood irrigation, water-saving technique has the effect of increasing production and harvest, economizing water, energy sources and field, saving work, time and power. It has best significance difference among unit yield of using different irrigation ways. The highest yield is in irrigation treatment of 80% field moisture capacity, it is secondary in seepage-preventing ditch irrigation treatment and is the lowest in spray irrigation treatment. Drip irrigation increase yield 4.0%~25.9%,Seepage-preventing ditch irrigation increase yield 17.5%, and spray irrigation decrease yield 22.4～37.8% comparing with flood irrigation. The effect to yield is obvious in drip irrigation treatment of different irrigation ration.

不同灌溉方式间单位产量存在显著差异，80％田间持水量灌溉处理产量最高，防渗渠畦灌次之，喷灌的产量最低；与土渠漫灌单位产量相比，滴灌增产4.0％～25.9％；防渗渠畦灌增产17.5％；喷灌产量下降22.4％～37.8％；滴灌试验中不同灌溉处理对产量的影响显著，随着灌溉定额的减少，产量随之下降，主要原因是60％田间持水量的灌溉处理限制了棉株的生长发育，降低了产量；不同灌溉方式的灌溉定额与绿洲内土渠漫灌平均灌溉定额相比，滴灌节水47.7％～54.4％，防渗渠畦灌节水38.56％，喷灌节水58.2％；滴灌、喷灌及防渗渠畦灌与土渠漫灌相比分别省工16.2％、25.1％和3.6％；滴灌和喷灌较防渗渠畦和土渠漫灌节地约5％～7％；从净收益来看，防渗渠畦灌较土渠漫灌经济效益提高了34.2％，滴灌提高了9.8％～48.2％，喷灌则下降了23.8％和44.7％；而且采用不同灌溉方式种植棉花，对于成铃率、衣指、衣分、纤维长度、产量等指标，滴灌要优于喷灌和防渗渠畦灌；而成铃数、种子数、铃重、籽指等指标，滴灌、喷灌均小于防渗渠畦灌。

Chapter three is the degradation of Abamectin in soils. The results show:(1) The decomposition of Abamectin is fastest in Aquic Cambosols while slowest in Udic Cambosols in five kinds of different soils.(2) Organic matter content in soil is the most important factor which influences the degradation half-life of Abamectin in soil, and their relative coefficient arrives at 0.9323, but pH value, total nitrogen, CEC and field maximum moisture capacity correlate little.(3) Soil organic matter, soil temperature and pesticide concentration can obviously affect Abamectin degradation in soil, in addition, the degradation half-life of Abamectin in sterilized soil is far more than that in non-sterilized soil, which maybe contributes to microorganism in soil. Chapter four is the microbial degradation of Abamectin.

第三章研究了阿维菌素在土壤中的降解，结果表明：(1)五种不同类型土壤中，阿维菌素在潮湿雏形土中降解最快，而在湿润雏形土中降解最慢；(2)土壤有机质含量与阿维菌素半衰期相关性较强，相关系数为0.9323，而土壤酸碱度、总氮含量、阳离子交换量和田间最大持水量等因子与阿维菌素半衰期相关性较小，说明影响阿维菌素在土壤中降解的最主要因子为有机质含量；(3)土壤有机质、土壤温度和农药浓度等因素对阿维菌素在土壤中的降解有较大影响，此外灭菌条件下其降解半衰期远大于未灭菌时的半衰期，这表明阿维菌素在土壤中的降解可能和土壤微生物有关。

The results showed that mixed forest improved sandy soil water-physical properties, that is, increased soil maximum moisture capacity, capillary capacity and field capacity.

结果表明，刺槐与杨树混交后，土壤水分-物理性质得到了改善，表现在土壤最大持水量增加，毛管持水量、田间持水量得以提高，土壤有效持水量也有了较大幅度的提高。

When moisture suction was 100-400cm,the water was between field moisture capacity and capillary disrupting moisture, and the water was the most efficient.

水吸力在100-400×102Pa时，土壤水分处于田间持水量到毛管断裂含水量之间，水分有效性最大。

After yearly burning, soil moisture content, porosity, separate coefficient, capillary and field moisture capacity increased, however, soil saturated water retaining capacity and unit weight decreased.

连年火烧使土壤含水率、孔隙度、分散系数、毛管持水量和田间持水量升高，而使土壤饱和持水量、容重下降。

Field moisture capacity is the key factor not only resulting in afforestation success or failure, but also that impacting on productivity of stand at hot-dry valley of Jinshajiang River. It was concluded by the investigation that: the contour trench (40 cm×40 cm), mixted with can increase the field moisture capacity, in accordance, the productivity of stand could bue improved in some degrees. But bearing the weight of soil capability, survival individual plant on unit area was about 525 plant/hm^2. Further-more, introduction of the grade 1 seedling in afforestation could improve survival rate, and facilitate the stand productivity.

土壤含水量是影响金沙江干热河谷造林成败的关键因子，同时也是影响林分生产力的限制性因子，通过试验得出：采用水平沟整地(40cm×40cm)、与多年生小灌木混交，可在一定程度上提高林地土壤含水量，从而使得造林保存率和林分生产能力均有提高，但是受其土壤承载能力的影响，单位面积的保存株数保持在525株/hm^2左右；此外，用Ⅰ级苗木造林，不但可以提高造林保存，对林分的后其生长也有促进作用。

By field and indoor test, the paper measures soil physical property, soilmoisture constant and soil water movement parameter, provides the soil specificgravity , the soil apparent density, the soil fraction, the soil field moisturecapacity, the soil saturated moisture capacity, the soil percent moisture content ofcom germination and seedlings emergence, the corn wilting point, and alsoestablishes the equation of soil water retention curves, the equation of soil waterdispersion coefficient and the relationship between pressure and soil apparentdensity, and so those provides the parameter for numerical simulation.

通过田间和室内试验，测定了供试土壤的物理性质、土壤水分常数和土壤水分运动参数，得到了该土样的比重、容重、机械组成、田间持水率、饱和含水率、玉米种子发芽出苗土壤含水率、玉米凋萎系数，给出了土壤水分特征曲线方程、土壤水分扩散系数方程及土壤容重与土壤压紧力的关系，提供了数值模拟过程中所需的参数。

The saturated water content, field moisture capacity, wilting coefficient, available water, readily available water, slowly available water of experimented soils respectively has negative power, logarithmic, exponential, exponential, exponential, power, logarithmic relationship with soil bulk density.

土壤容重对土壤水分蓄持能力有较大影响，土壤蓄水能力随容重增大递减，比水容量也随容重增大递减，土壤饱和含水量、毛管断裂含水量、田间持水量、凋萎系数、有效水含量、易效水含量、迟效水含量与容重分别呈幂函数、对数、指数、指数、指数、幂函数、对数关系。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。