In drought year, when the natural rainfall is 201.8mm during growth phase of maize and maize yield more than 7500kg/hm2, the irrigation norm ranges from 86% to 92% of field moisture capacity, application of urea ranges from 764.23kg/hm2 to 1008.49kg/hm2, application of calcium superphosphate ranges from 1054.2kg/hm2 to 1350.9kg/hm2.
secondly, for Lolium perenue, the value of bulk density declined with the decrement of 0.07 after one year , the total soil porosity increased by 2.12%, capillary porosity 1.50% and field moisture capacity 3.48%;
Br and Trifollumpratense,T. repense are better, one year latter, the values of bulk density declined with the decrement of 0.08 and 0.11, the total soil porosity increased by 7.14% and 5.10%, capillary porosity increased by 6.42% and 3.71%, and field moisture capacity increased by 5.33% and 3.48%;
The results showed:the treatment with irrigation maximum of 90% field water capacity is more reasonable,and under this treatment,stems in spring and autumn was thicker by 0.03 cm and 0.05 cm;
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.
The results showed that: the order of the maximum gross water capacity of stands was pattern Ⅱ> pattern Ⅲ> patternⅠ, respectively higher than control by 24.97%, 17.57% and 9.58%;
(2) The yield of cucumber is the highest by 389.65g/plant when soil relative moisture is 80%~90% field water capacity in florescent stage and early-fruit stage, 90%~100% field water capacity in fruit stage and 70%~80% field water capacity in late-fruit stage. Its increased yield is 27.74%? 18.21%?
Aboveground biomass,regeneration rate and turfgrass quality of perennial ryegrass,Kentucky bluegrass and tall fescue under different soil moisture gradients of 30%~50% field water capacity(FC),FC 50%~70% and FC 70%~90% in the whole experimental period was measured under field conditions.
(3) Water holding capacity of canopy in Chinese fir forest in Fujian were 3.45 t-hm-2 at young-tree stage, 10.52 t-hm-2at fast-growth stage, 16.68 t-hm-2 at timber stage and
While water holding capacity of undergrowth ranged from 0.43 to 36.22 t-hm-2, with mean of 4.40 t-hm-2. The corresponding values for forest floors were 0.936 t-hm-2, 5.56 t-hm-2, 8.22 t-hm-2 and
Generally, the litter layer of the natural subalpine coniferous forests was 0～26cm, the average pool of litter layer was about 40×10 3kg/hm 2, water holding capacity was 16.87～461.87×10 3kg/hm 2, the return of the main nutrient elements(N?P?K?Ca?Mg)was 323.3～1246.2kg/hm 2;
hard broadleaved>Chinese fir>soft broadleaved>pine and bamboo. Biomass and water holding capacity of undergrowth for major forest types in Fujian were 0.24~39.25 t-hm-2 and 0.40-30.35 t-hm-2 with the means of 7.65 and 5.63 t-hm-2 respectively.
the saturated water retaining capacity of forest litters was 4.47mm,effective water storing capacity 2.61mm,surface run-off 6.641～10.991mm,and run-off co-efficient 1.22%～1.41%
The study with 25 two-line hybrid rice strains showed that their water retaining capacity was different with their combinations. On the whole,the water content in leaf and stem-sheath decreased during heading-grain filling stage,while that in panicle increased first and then decreased,with a peak at 7th day after heading.
The forest canopy layer and underground part of No. 1, 2 and 5 provenances in Yong’an field and No. 3 provenance in Longhai field are possessed of larger biomass and higher water retaining capacity;
Study showed that the non-capillary water retaining capacity was 1.5(--)2 times as high as that of arable farmland soil and the effective water storage of the soil was 1.1(--)1.9 times as high,the exception was the soil of P. pubescens forests.
It is shown that the theory of the volumetric filling of micropores may be used to calculate sorption isotherms and the specific isothermal moisture capacity of electrically insulating cellulose materials.
Through sample analysis the paper arrives at following conclusions: 1) Exerting electric field can make soil's granular structure increase, bulk density decrease, moisture capacity increase, thus improving the perviousness of soil.
For the albic soil cultivated with forage, the cumulative effects were apparently strengthened with the increase of cultivating years, especially for the bulk density, total porosity, capillary porosity and capillary moisture capacity.
However, the distribution of Cd in different size fractions and the chemical speciation of particulate-bound Cd in the clay size fractions when introduced to soil and allowed to incubate at field moisture capacity merits attention.
We studied a non-linear drainage parametrization, and a distributed surface runoff parametrization, accounting for the subgrid scale variability (SSV) of soil moisture capacity, through a distribution where the shape parameter was b.
The conditions of rather low temperature (5°C) and an increased moisture content (120% of the field water capacity) are the most favorable for mycelium growth and copper mobilization.
The available soil water capacity (ASWC) is important for studying crop production, agro-ecological zoning, irrigation planning, and land cover changes.
It is suggested that the basic factor of desertification in the area is water deficiency (seasonal drought and low soil water capacity) and the direct dynamic of desertification is soil erosion.
Soil physical and chemical analysis showed that both soils are widely variable in water holding capacity, organic matter, pH value, CaCO3, salinity, cation exchange capacity, and soil bulk density in the topsoil (0-30 cm).
The experiment reuslts on detention of precipitation, permeability of stand soil water holding capacity, formation and regulation of runoff are discussed in the this paper.
Frequency data for fifty-nine vascular species and varieties are presented in association with environmental data relating to soil moisture, water retaining capacity, soil pH and slope position.
持水量
moisture capacity
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