持水量

正常水分为50%-60%田间持水量（0f）处理下长穗柽柳的旬耗水量与各旬水面蒸发的相关系数为0.88。

The correlation coefficient was 0.88 between water consumption and water evaporation of every period of ten days in field water-holding capacity (θ f ) of 50 % - 60 % .

其中容重最小的是3基质（0.15g／cm~3），其容重只有对照（15常规育苗基质）的17%，而最大持水量却是对照（15基质）的6倍。

( 0.15g / cm3 ) among them , and its weight is 17 % of the contrast , but water-holding capacity is 6 times contrasted ( No. 15 ) . The weight of No.

田间持水量（58%wfps）时，N2O释放的稳定浓度达到最大；

The highest concentration occurred at the field water capacity ( 58 % wfps ) .

正常CO2浓度条件下，土壤湿度为田间持水量的45%～60%时，土壤活性有机碳的含量最高。

Under different soil moisture conditions , the content of SAC is highest when soil moisture is between 45 % ~ 60 % of soil water holding capacity ;

在良好的土壤水分条件下，4种果树的RT随着土壤相对持水量的下降而迅速延长，并在土壤水分含量降低到一临界值以下时维持在24h。

RT increased sharply as soil drying , then remained 24 hr if the soil water content was under a critical level .

不同化学改良剂均能不同程度的提高土壤渗透率，增加田间持水量，降低土壤pH值，减少土壤全盐量，增加阳离子交换量，降低碱化度等。

Different chemical improvers were able to increase soil permeability and soil field capacity , reduce soil pH , reduce soil total salt content , increase CEC , reduce ESP in different extent .

该k值与土壤在最大持水量30%时的k值的比值定义为释放速率系数a，并用土水势（Ψ）的函数表示。

The release rate coefficient ( a ) is defined as the ratio both k values under the each soil moistures and 30 % moisture , and expressed as a function of soil moisture potential (Ψ) .

通过室内培养试验研究了不同水分（淹水和60%田间持水量）及施P量对水稻土速效P及水层含P量的影响。

An indoor incubation experiment was conducted to investigate dynamics of available phosphorus ( P ) content in paddy soils different in soil moisture regime ( submerged or 60 % water holding capacity ) and submerging water layer as influenced by phosphate fertilizer application .

土壤含水量为60%～75%田间持水量（θF）的植株叶片蒸腾和光合速率均居于较高水平，前期产量最高；

At soil water content 60 % ~ 75 % field water capacity ( θ F ), the transpiration rate and photosynthetic rate of plants were higher then others , and the prophase yields were the highest .

两个大田试验保水膜对提高烟田土壤田间持水量效果经方差分析，用SSR法进行多重比较，置保水膜处理与对照比较差异均达显著水平。

By analysis of variance and SSR multiple comparisons , in two tobacco fields , the check difference was apparent which paved the keeping water membrane compared with another without it .

在土壤含水量为80%田间持水量时，随着伤根程度的加剧和伤根时间的后移，谷子子粒产量WUE下降，伤根不利于谷子WUE的提高；

At the 80 % field capacity , when the root was cutted more seriously and more later , the seed yield WUE of millet were dropped ;

三个林型土壤田间持水量、毛管持水量和饱和持水量均随土壤深度增加而变小；垂直方向向上BOD5随水深增加递减。

Soil moisture contents decreased with the increase of soil depth . and decreased successively with the increase of water depth in vertical direction .

结果表明：该城区绿地土壤的容重较大，孔隙度和田间持水量少，有机质缺乏，养分含量不均，pH值呈上升趋势。

The results were as follows : The soil bulk density was higher , total porosity and field capacity of preserving water were small , organic materials were scant , the content of nutrients distributed uniformly , and the trend of pH value was upward .

播种时田间持水量保持在80%左右，以当年的褐色种子浸种，播深1～2cm；

The field capacity about 80 % for sowing is maintained . The brown seed harvested in this year is used for soaking .

矿化和硝化试验中称量10g风干土在65%或100%田间持水量（FC，Fieldcapacity），28℃条件下培养。矿化试验不加氮肥，而硝化试验加200mgN／kg的尿素。

Mineralization and nitrification incubation experiments were conducted under 65 % FC ( field capacity ) or 100 % FC and 28 C , and for nitrification study 200mgN / kg of urea was added to the soil .

结果表明：适合鱼腥草种茎萌发的土壤相对持水量（RH）为90%以上；

The results indicated , the optimum soil relative water-retaining capacities ( RH ) for breeding stems germination of H.Cordata Thunb was 90 % and the high soil RH was beneficial to stem elongation and yield formation .

地木耳的自然含水量42%，持水量18.6%，在海拔600～800m之间，地木耳生物量最大；

Natural water content of it is 42 % and water holding capacity 18 6 % . The biomass is the largest in altitude 600 ￣ 800 m ;

在50%土壤饱和持水量下，分根区施保水剂显著降低了叶片气孔导度，叶片CO2吸收量和H2O蒸腾量也同时降低，但H2O蒸腾量下降幅度更大；

And under 50 % soil saturated capacity , leaf stomatal conductance decreased evidently , and the volume of CO_2 absorption and H_2O transpiration both decreased as well but the H_2O transpiration reduced with more extent .

施用PAM后对土壤容重及土壤总孔隙度具有调节作用，土壤饱和含水量和田间持水量均有所增大，并显示出较强的抗蒸保墒效果。

When using PAM , the soil saturation content and soil field water-content can increase and the treatment can prevent the evaporation of soil water , so the water content of the treatment is higher than control .

常绿阔叶林的非毛管持水量通常高于100mm，而寒温带/温带落叶阔叶林和常绿针叶林通常低于100mm。

Non_ capillary capacity of evergreen broadleaf forests was more than 100 mm , but was less than 100 mm in the cold_temperate / temperate deciduous broadleaf and evergreen coniferous forests .

同样环境条件下，DMA的脱甲基化速率明显快于MMA；DMA、MMA两种有机砷的最快转化的土壤水分条件分别为100%最大田间持水量和70%最大田间持水量。

Under the same condition , the demethylation speed of DMA is apparently faster than MMA ; The optimal soil moisture for the transformation of DMA and MMA are 100 % , 70 % of the maxmun field capacity . 3 .

黄河古道沙土的裸地土壤含水量在正常降水补给下可达到田间持水量的水平，直到10月时，0～100cm土壤含水量仍为15%。

The moisture in the fallow sandy soil could reach field capacity under the nor - mal precipitation and moisture content was 15 % in 0-100 cm depth in October .

土壤样品（干土或湿土，湿土含水量为50%田间持水量）中6种PAHs的方法回收率均高于85%，RSD则低于3.1%；

As to the soil samples including the dry soil ( DS ) and wet soil ( WS , 50 % of the field holding capacity ), the recoveries of these PAHs were always larger than 85 % with RSD smaller than 3.1 % .

，施钾水平为0,15,60mg·kg-1.于顶部分枝始花期开始干旱处理，用称重法使土壤含水量控制在田间持水量的40%&50%，持续14d后停止浇水。

Drought treatment , keeping the soil water content at 40 % - 50 % of field capacity by weighing the pots , kept on for 14 d starting at the beginning of flowering on the top branches , no watering afterwards .

而在田间持水量85%时分别达最小值，27.97mg/kg和23.52mg/kg。

While the lowest Cd concentrations of 27.97mg/kg and 23.52mg / kg , were found for the treatment with field moisture capacity of 85 % .

在田间持水量土壤水分状态下（W2），细根吸水阻力成倍增加，吸水速率和蒸腾速率显著下降，但尚未改变蒸腾作用日动态过程的单峰模式。

Under field capacity ( W 2 ), soil-root hydraulic resistance increased several times above that under W 1 , water suction rate and transpiration rate declined significantly , while the diurnal single-peak pattern of transpiration was not altered .

在各向同性下，土壤特性的相关距离在74～186m之间，最大的为土壤田间持水量，最小的是水稳性团聚体含量。

Under the assumption of the isotropy , the range of soil properties correlation distance was 74 ~ 186m , the maximum is field capacity and the minimum is soil aggregates .

土壤容重降低0.3445g／cm3和0.2050g／cm3，土壤变得更为疏松；毛管持水量增加12.59%和12.02%，土壤保水蓄水能力增强。

The soil has become more porous and the soil unit weight has had a drop of 0.3445g/cm3 and 0.2050g/cm3 and its capillary water capacity has increased by 12.59 % and 12.02 % , the water preservation and storage capacity of the soil has been considerably strengthened .

复合模式林枯枝落叶的蓄积量为7.08t/hm2，对降水的平均截留率为12.47%，其最大持水量相当于1.8mm的降水；

Litter storage of the compound model is 7.08 t · hm ~ - 2 and the intercepting rate averages 12.47 % , its minimum water-holding capacity is equivalent to the rainfall in 1.8 mm ;

而16d收获时，玉米生物量在田间持水量为35%和85%时比在其它水分时低许多。

At 22d after emergence , the aboveground and underground biomass of corn increased with increasing soil water content , while at 16d corn biomass for field moisture capacity of 35 % and 85 % were lower than those for other soil water contents .