It is noted that there has been little research to compare volume-based and number-based soil particle size distributions （PSDs）. Our objectives were to characterize the scaling properties and the possible connectio...It is noted that there has been little research to compare volume-based and number-based soil particle size distributions （PSDs）. Our objectives were to characterize the scaling properties and the possible connections between volume-based and number-based PSDs by applying single and joint multifractal analysis. Twelve soil samples were taken from selected sites in Northwest China and their PSDs were analyzed using laser diffractometry. The results indicated that the volume-based PSDs of all 12 samples and the number-based PSDs of 4 samples had multifractal scalings for moment order -6 〈 q 〈： 6. Some empirical relationships were identified between the extreme probability values, maximum probability （Pmax）, minimum probability （Pmin）, and Pmax/Pmin, and the multifractal indices, the difference and the ratio of generalized dimensions at q = 0 and 1 （Do - D1 and D1/Do）, maximum and minimum singularity strength （αmax and OZmin） and their difference （αmax - αmin, spectrum width）, and asymmetric index （RD）. An increase in Pmax generally resulted in corresponding increases of Do - D1, αmax, αmax - αmin, and RD, which indicated that a large Pmax increased the multifractality of a distribution. Joint multifractal analysis showed that there was significant correlation between the scaling indices of volume-based and number-based PSDs. The multifractality indices indicated that for a given soil, the volume-based PSD was more homogeneous than the number-based PSD, and more likely to display monofractal rather than multifractal scaling.展开更多
为了探索施用腐殖酸复合肥在高寒地区对葡萄品种‘夏黑’和‘无核白鸡心’果实品质的影响以及施肥后土壤理化指标的变化,在大棚栽培条件下,从葡萄开花前采用栽植沟内冲施3000倍液腐殖酸肥的方法,每30 d 1次,共4次,调查其对葡萄植株根系...为了探索施用腐殖酸复合肥在高寒地区对葡萄品种‘夏黑’和‘无核白鸡心’果实品质的影响以及施肥后土壤理化指标的变化,在大棚栽培条件下,从葡萄开花前采用栽植沟内冲施3000倍液腐殖酸肥的方法,每30 d 1次,共4次,调查其对葡萄植株根系周边土壤主要指标及果实品质的影响。结果表明,‘夏黑’葡萄施用腐殖酸肥后较施肥前,其根系周边土壤的水解性氮含量减少5.7%,对照清水处理后较处理前减少13.5%,施肥处理较对照提升了7.8百分点;施用腐殖酸肥后较施肥前有效磷含量增加9.1%,对照清水处理后较处理前增加4.8%,施肥处理较对照提升了4.3百分点;施用腐殖酸肥后较施肥前速效钾含量增加3.1%,对照清水处理后较处理前增加2.6%,施肥处理较对照提升了0.5百分点。施用腐殖酸肥后较施肥前水溶性盐含量减少82.4%,对照清水处理后较处理前减少50.0%,施肥处理较对照相差32.4百分点,降盐效果明显;土壤pH也略有下降,施用腐殖酸肥后较施肥前从7.7降到7.4。施用腐殖酸复合肥后,‘夏黑’葡萄的粒重、穗重、可溶性固形物含量分别比对照增加13.09%、13.29%和13.11%,对提升葡萄果实品质有比较明显的积极作用。‘无核白鸡心’葡萄施用腐殖酸复合肥后较施肥前,根系周边土壤的有机质含量比对照提升了1.9个百分点,‘无核白鸡心’葡萄的粒重、穗重、可溶性固形物含量分别比对照增加15.20%、10.16%、1.70%,对提升果实品质也有明显的积极作用。展开更多
Getting aware of one kind of soil surface attributs is very important. Assessment of important attributes of soil and vegetation can help us to be aware of rangeland potential and help us to determine its situation. T...Getting aware of one kind of soil surface attributs is very important. Assessment of important attributes of soil and vegetation can help us to be aware of rangeland potential and help us to determine its situation. The goal of this research is to determine some plant and soil indicators of hilly winter rangelands of Eastern and Southern slopes of Chaharbagh region in Golestan province. By considering plant cover and soil surface attributes, it used the SSCC （soil surface classification） method to assess soil surface attributes. The length and width of ecological patches were measured in the forms of lichen, lichen-Grass, forbs, shrub and bare soil inter patches with litter. Also in this research, it measured the 11 soil surface parameters. These parameters are belonging to three main soil attributes stability, infiltration and nutrient cycles. These three indicators were measured in east and west of Eastern and Southern slopes of this ecosystem and showed significance differences （p 〈 0.05） in shrub, forbs and lichen-grass. In southern and especially in west aspect, these indicators in shrub were more than Eastern. But, in lossy hill of Eastern, lichen-grass patch is more significant. The most important ecological indicators of east landscapes of this region are forbs and lichen-grass.展开更多
基金Supported by the National Natural Science Foundation of China (No. 50709028)the Basic Foundation for Scientific Researchof Northwest Agriculture and Forestry Sci-Tech University,China (No. QN2009087)
文摘It is noted that there has been little research to compare volume-based and number-based soil particle size distributions （PSDs）. Our objectives were to characterize the scaling properties and the possible connections between volume-based and number-based PSDs by applying single and joint multifractal analysis. Twelve soil samples were taken from selected sites in Northwest China and their PSDs were analyzed using laser diffractometry. The results indicated that the volume-based PSDs of all 12 samples and the number-based PSDs of 4 samples had multifractal scalings for moment order -6 〈 q 〈： 6. Some empirical relationships were identified between the extreme probability values, maximum probability （Pmax）, minimum probability （Pmin）, and Pmax/Pmin, and the multifractal indices, the difference and the ratio of generalized dimensions at q = 0 and 1 （Do - D1 and D1/Do）, maximum and minimum singularity strength （αmax and OZmin） and their difference （αmax - αmin, spectrum width）, and asymmetric index （RD）. An increase in Pmax generally resulted in corresponding increases of Do - D1, αmax, αmax - αmin, and RD, which indicated that a large Pmax increased the multifractality of a distribution. Joint multifractal analysis showed that there was significant correlation between the scaling indices of volume-based and number-based PSDs. The multifractality indices indicated that for a given soil, the volume-based PSD was more homogeneous than the number-based PSD, and more likely to display monofractal rather than multifractal scaling.
文摘为了探索施用腐殖酸复合肥在高寒地区对葡萄品种‘夏黑’和‘无核白鸡心’果实品质的影响以及施肥后土壤理化指标的变化,在大棚栽培条件下,从葡萄开花前采用栽植沟内冲施3000倍液腐殖酸肥的方法,每30 d 1次,共4次,调查其对葡萄植株根系周边土壤主要指标及果实品质的影响。结果表明,‘夏黑’葡萄施用腐殖酸肥后较施肥前,其根系周边土壤的水解性氮含量减少5.7%,对照清水处理后较处理前减少13.5%,施肥处理较对照提升了7.8百分点;施用腐殖酸肥后较施肥前有效磷含量增加9.1%,对照清水处理后较处理前增加4.8%,施肥处理较对照提升了4.3百分点;施用腐殖酸肥后较施肥前速效钾含量增加3.1%,对照清水处理后较处理前增加2.6%,施肥处理较对照提升了0.5百分点。施用腐殖酸肥后较施肥前水溶性盐含量减少82.4%,对照清水处理后较处理前减少50.0%,施肥处理较对照相差32.4百分点,降盐效果明显;土壤pH也略有下降,施用腐殖酸肥后较施肥前从7.7降到7.4。施用腐殖酸复合肥后,‘夏黑’葡萄的粒重、穗重、可溶性固形物含量分别比对照增加13.09%、13.29%和13.11%,对提升葡萄果实品质有比较明显的积极作用。‘无核白鸡心’葡萄施用腐殖酸复合肥后较施肥前,根系周边土壤的有机质含量比对照提升了1.9个百分点,‘无核白鸡心’葡萄的粒重、穗重、可溶性固形物含量分别比对照增加15.20%、10.16%、1.70%,对提升果实品质也有明显的积极作用。
文摘Getting aware of one kind of soil surface attributs is very important. Assessment of important attributes of soil and vegetation can help us to be aware of rangeland potential and help us to determine its situation. The goal of this research is to determine some plant and soil indicators of hilly winter rangelands of Eastern and Southern slopes of Chaharbagh region in Golestan province. By considering plant cover and soil surface attributes, it used the SSCC （soil surface classification） method to assess soil surface attributes. The length and width of ecological patches were measured in the forms of lichen, lichen-Grass, forbs, shrub and bare soil inter patches with litter. Also in this research, it measured the 11 soil surface parameters. These parameters are belonging to three main soil attributes stability, infiltration and nutrient cycles. These three indicators were measured in east and west of Eastern and Southern slopes of this ecosystem and showed significance differences （p 〈 0.05） in shrub, forbs and lichen-grass. In southern and especially in west aspect, these indicators in shrub were more than Eastern. But, in lossy hill of Eastern, lichen-grass patch is more significant. The most important ecological indicators of east landscapes of this region are forbs and lichen-grass.
