The results indicated that soil moisture had obvious variation characteristic,being increasing first,from August to November and then declined from next March to July There was an obvious vertical distribution pattern,which was divided into the changeable level(from 10 to 40cm),the slow changing level(from 40 to 110) and the stable level(from 110 to 200cm).
The space variation characteristic of different layer soil organic matter and total nitrogen is different, but the structure factor plays a leading role in the space variation of full nitrogen and organic matter.
According to the Shizi small watershed's soil erosion space variation characteristic,the geostatistics method analysis indicated,the erosion in the area is on belt distributing. Its variant characteristic is similar to the topography distribution and land use structure distributing characteristic.
By monitoring the soil moisture in different layers (20cm) of soil profile (0-200cm) with different vegetation cover types in loess area during 2004 (from July to October) and 2005 (from April to October), the paper focus on analyzing the distribution characteristics, the season dynamic state variety, the variation characteristic of soil moisture of soil profile and the influence of the different vegetation cover types upon the soil moisture.
According to the principle of the consumption demand of the water yield for growing field crops and its relationship with the precipitation,the dynamic variation characteristic of the regional groundwater pumpage for agriculture and the shallow groundwater level responding to the precipitation in North China Plain from 1986 to 2000,this paper suggests the regular contrary change of the regional groundwater pumpage for agriculture responding to the precipitation,the consumption demand of the water yield and the annual pumpage increases or decreases with the annual precipitation.
The accurate delineation of specific boundaries has no doubt been confounded by the diminutive size, nocturnal habits, and subtle morphological variation characteristic of mouse lemurs, which can make field identification of individuals problematic.
It is suggested that regulation of phenotypic expressivity of qualitative genetic potentialities can lead to a pattern of continuous variation characteristic of the quantitative traits.
It was apparent throughout the study that comparisons of microcosms and natural systems must account for the large variation characteristic of each.
The energy balance also shows an obvious daily variation characteristic.
Analysis on the spatial distribution variation characteristic of urban heat environmental quality and its mechanism
The simulated experiment under rainproof in field was done to study the characteristicsof energy variation and distribution in SPAC in the different treatments of water supply levels.Theresults showed that the leaf water potentoal was linearly decreased with the decrease of the soil wa-ter potential,and it was affected by the pneumatic potential.but the effect of the soil water poten-tial to the leaf water potential was greater than that of the pneumatic potential.During the growthof the crop,the leaf...
The simulated experiment under rainproof in field was done to study the characteristicsof energy variation and distribution in SPAC in the different treatments of water supply levels.Theresults showed that the leaf water potentoal was linearly decreased with the decrease of the soil wa-ter potential,and it was affected by the pneumatic potential.but the effect of the soil water poten-tial to the leaf water potential was greater than that of the pneumatic potential.During the growthof the crop,the leaf water potential displayed the dynamic variation characteristics of the decreasingstage at first and thd increasing stage at latter. The dynamic feature of the root xylem water poten-tial variation was the same as that of the leaf water potential variation,the root xylem water poten-tial was larger than the corresponding leaf water potential,the difference value was the range of0.25～0.60MP_a. In the five different treatments of water supply levels,the loss of energy of waterfrom soil to root xylem was the range of 0.81～1.41 MP_a,0.91～1.56MP_a,0.94～1.67MP_a,0.92～1.68MP_a,0.77～1.82MP_a,respectively;from roct xylem to leaf was the range of 0.25～0.50MP_a,0.28～0.53MP_a,0.3～0.60MP_a,0.33～0.67MP_a,respectively;and from substomatalcavities to atmosphere was the range of 55 36～111.30MP_a,55.14～111.14MP_a,55.01～111.09MP_a,54.61～111.04MP_a,54.46～110.97MP_a,respectively. Therefore,when water floW-ing in SPAC,the vaporization of water in leaf and the diffusion of water vapor were main positionsof energy transformation and loss,and the main energy loss of liquid water flowing took place in theconnecting “chain”through which water entered the root from soil.
The space variations of soil moisture and sample contents are decisive factors to the error ranges and accuracies of the determination. With the statistic analysis of different soil water content rates in samples with the content of 15, the variation characteristics of different soil water content rates at 1 m soil layer are obtained.And the relationship between the sample content, and the measurement accuracy requirement and characteristic value is found out. Also this paper points out that...
The space variations of soil moisture and sample contents are decisive factors to the error ranges and accuracies of the determination. With the statistic analysis of different soil water content rates in samples with the content of 15, the variation characteristics of different soil water content rates at 1 m soil layer are obtained.And the relationship between the sample content, and the measurement accuracy requirement and characteristic value is found out. Also this paper points out that limited numbers of sample contents can't meet the accuracy requirements in research. In general, at least 5～8 sample contents can possibly keep the relative error of the measurement under 5%～10%.
The results obtained by the determination of humus composition and the determination of elemental composition,optical density, distribution of molecular weight and thermal properties of humic acids in lateritic red earth,lateritic red earth in orange plantation and vegetable soil developed on the lateritic red earth indicated that the mellowness of lateritic red rarth through dry farming was favorable not only to the formation of humic acid but...
The results obtained by the determination of humus composition and the determination of elemental composition,optical density, distribution of molecular weight and thermal properties of humic acids in lateritic red earth,lateritic red earth in orange plantation and vegetable soil developed on the lateritic red earth indicated that the mellowness of lateritic red rarth through dry farming was favorable not only to the formation of humic acid but also to the improvement of aromaticity and the increase of molecular weight.The thermal properties of humic acid,to certain extent,reflected its structural variation characteristics.
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variation characteristic
变化特征
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