首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到18条相似文献,搜索用时 113 毫秒
1.
The stability of aggregates in the surface soil is crucial to soil erosion and runoff generation. Thus, to understand the stability and the breakdown mechanisms of soil aggregates as well as the relationship between aggregate stability and selected soil chemical properties, such as different forms of Fe and A1 oxides, organic matter, CEC and clay content, the aggregates of slightly and severely eroded red soils derived from Quaternary red clay in subtropical China were analyzed using the routine wet sieving and the Le Bissonnais methods. The results indicated that the aggregates of the severely eroded soils were more stable than those of the slightly eroded soils. Different aggregate breakdown mechanisms resulted in different particle size distribution. The slaking from entrapped air in aggregates severely destroyed the soil aggregates,especially in the slightly eroded soils. Meanwhile, mechanical breakdown and microcracking had little effect on the aggregates compared to slaking. The fragments resulting from slaking were mainly microaggregates that increased in size with increasing clay content. The main fragment size of the slightly eroded soils was 1.0-0.2 mm, while for the severely eroded soils it was 5.0-2.0 mm and 1.0-0.5 mm. Overall, more than 20% of the fragments were smaller than 0.2 mm.In addition, aggregate stability was positively and often significantly correlated with Fed, Ald, Feo and clay content, but significantly and negatively correlated to SOC.  相似文献   

2.
湿润速率和粘粒含量对红壤沟间侵蚀的影响   总被引:4,自引:0,他引:4  
An aggregate stability test and a simulated rainfall test were conducted on four representative Ultisols from southeastern China. The soils selected, with clay contents ranging between 117 and 580 g kg-1 , were derived from shale and Quaternary red clay. The stability of aggregates (2–5 mm in diameter) obtained from the soil samples were determined by the Le Bissonnais method. For determination of infiltration, runoff, and erosion, the soil samples were packed in 30 cm × 60 cm trays, wetted at rates of 2, 10, and 60 mm h-1 , and then exposed to simulated rainfall at 60 mm h-1 for 1 h. The results indicated that both aggregate stability and slaking caused by fast wetting increased with increasing clay content. The effect of wetting rate (WR) on infiltration and seal formation varied with clay contents. In the soil with low clay content (sandy loam), the infiltration rate was affected slightly by WR due to low aggregate stability and slaking. In the soils with medium clay content (silt clay loam and clay), WR affected infiltration significantly due to the high aggregate slaking force. In the soil with high clay content, the effect of WR on infiltration was significant, but not as evident as in the soils with medium clay content, which may be related to high aggregate stability by wetting partially compensating for slaking force. The effect of WR on soil loss was similar to that of runoff, but more pronounced. The findings from this study indicated that the relationship between wetting rate and clay content should be considered when predicting interrill erosion in Ultisols.  相似文献   

3.
利用方式和土壤肥力对土壤团聚体和养分的影响   总被引:6,自引:0,他引:6  
The size distribution of water-stable aggregates and the variability of organic C, N and P contents over aggregate size fractions were studied for orchard, upland, paddy, and grassland soils with high, medium, and low fertility levels. The results showed that > 5 mm aggregates in the cultivated upland and paddy soils were 44.0% and 32.0%, respectively, less than those in the un-tilled orchard soil. Organic C and soil N in different size aggregate fractions in orchard soil with high fertility were significantly higher than those of other land uses. However, the contents of soil P in different size aggregates were significantly greater in the paddy soil as compared to the other land uses. Soil organic C, N and P contents were higher in larger aggregates than those in smaller ones. The amount of water-stable aggregates was positively correlated to their contribution to soil organic C, N and P. For orchard and grassland soils, the > 5 mm aggregates made the greatest contribution to soil nutrients, while for upland soil, the 0.25-0.053 mm aggregates contributed the most to soil nutrients. Therefore, the land use with minimum disturbance was beneficial for the formation of a better soil structure. The dominant soil aggregates in different land use types determined the distribution of soil nutrients. Utilization efficiency of soil P could be improved by converting other land uses to the paddy soil.  相似文献   

4.
铵、钾同时存在时, 土壤对铵的优先吸附   总被引:7,自引:0,他引:7  
The water stability of aggregates in various size classes separated from 18 samples of red soils under different managements, and the mechanisms responsible for the formation of water-stable soil aggregates were studied. The results showed that the water stability of soil aggregates declined with increasing size, especially for the low organic matter soils. Organic matter plays a key role in the formation of water-stable soil aggregates. The larger the soil aggregate size, the greater the impact of organic matter on the water stability of soil aggregates. Removal of organic matter markedly disintegrated the large water-stable aggregates (> 2.0 mm) and increased the small ones (< 0.25-0.5mm) to some extent, whereas removal of free iron(aluminium) oxides considerably destroyed aggregates of all sizes, especially the < 0.25-0.5 mm classes. The contents of organic matter in water-stable aggregates increased with aggregate sizes. It is concluded from this study that small water-stable aggregates (< 0.25-0.5 mm) were chiefly cemented by Fe and Al oxides whilst the large ones (> 2.0 mm) were mainly glued up by organic matter. Both free oxides and organic matter contribute to the formation and water stability of aggregates in red soils.  相似文献   

5.
Aggregation and structure play key roles in water-holding capacity and stability of soils.In this study,the incorporation of carbon(C) from switchgrass biochar into stable aggregate size fractions was assessed in an Aridisol(from Colorado,USA) dominated by 2:1 clays and an Alfisol(from Virginia,USA) containing weathered mixed 1:1 and 2:1 mineralogy,to evaluate the effect of biochar addition on soil characteristics.The biochar was applied at 4 levels,0,25,50,and 100 g kg~(-1),to the soils grown with wheat in a growth chamber experiment.The changes in soil strength and water-holding capacity using water release curves were measured.In the Colorado soil,the proportion of soil occurring in large aggregates decreased,with concomitant increases in small size fractions.No changes in aggregate size fractions occurred in the Virginia soil.In the Colorado soil,C content increased from 3.3 to 16.8 g kg~(-1),whereas in the53 μm fraction C content increased from 5.7 to 22.6 g kg~(-1) with 100 g kg~(-1)biochar addition.In the Virginia soil,C content within aggregate size fractions increased for each size fraction,except the2 000 μm fraction.The greatest increase(from 6.2 to 22.0 g kg~(-1)) occurred in the 53–250 μm fraction.The results indicated that C was incorporated into larger aggregates in the Virginia soil,but remained largely unassociated to soil particles in the Colorado soil.Biochar addition had no significant effect on water-holding capacity or strength measurements.Adding biochar to more weathered soils with high native soil organic content may result in greater stabilization of incorporated C and result in less loss because of erosion and transport,compared with the soils dominated by 2:1 clays and low native soil organic content.  相似文献   

6.
Biologically active soil organic carbon (BASOC) is an important fraction of soil organic carbon (SOC), but our understanding of the correlation between BASOC and soil aggregate stability is limited. At an ecological experimental station (28°04 -28°37 N, 116° 41 -117° 09 E) in Yujiang County, Jiangxi Province, China, we analyzed the dynamic relationship between soil aggregate stability and BASOC content over time in the red soil (Udic Ferrosols) fertilized with a nitrogen-phosphorus-potassium chemical fertilizer (NPK) without manure or with NPK plus livestock manure or green manure. The dynamics of BASOC was evaluated using CO2 effux, and soil aggregates were separated according to size using a wet-sieving technique. The soils fertilized with NPK plus livestock manure had a significantly higher content of BASOC and an improved aggregate stability compared to the soils fertilized with NPK plus green manure or NPK alone. The BASOC contents in all fertilized soils decreased over time. The contents of large aggregates (800-2000 μm) dramatically decreased over the first 7 d of incubation, but the contents of small aggregates (< 800 μm) either remained the same or increased, depending on the incubation time and specific aggregate sizes. The aggregate stability did not differ significantly at the beginning and end of incubation, but the lowest stability in all fertilized soils occurred in the middle of the incubation, which implied that the soils had a strong resilience for aggregate stability. The change in BASOC content was only correlated with aggregate stability during the first 27 d of incubation.  相似文献   

7.
黄土高原植被自然恢复中土壤团聚体特征   总被引:4,自引:0,他引:4  
Field investigations and laboratory analysis were conducted to study the characteristics of soil water-stable aggregates during vegetation rehabilitation in typical grassland soils of the hilly-gullied loess area. The relationship between water- stable aggregates and other soil properties was analyzed using canonical correlation analysis and principal component analysis. The results show that during the natural revegetation, the aggregates 〉 5 mm dominated and constituted between 50% and 80% of the total soil water-stable aggregates in most of the soil layers. The 2-5 mm aggregate class was the second main component. The mean value of water-stable aggregates 〉 5 mm within the 0-2 m soil profile under different plant communities decreased in the following order: Stipa grandis 〉 Stipa bungeana Trin. 〉 Artemisia sacrorum Ledeb. 〉 Thymus mongolicus Ronn. 〉 Hierochloe odorata (L.) Beauv. Clay, organic matter, and total N were the key factors that influenced the water stability of the aggregates. Total N and organic matter were the main factors that affected the water stability of the aggregates 〉 5 mm and 0.5-1 mm in size. The contents of Fe2O3, Al2O3, and physical clay (〈 0.01 mm) were the main factors which affected the water stability of the 1-2 and 0.25-0.5 mm aggregates.  相似文献   

8.
The Taihu Lake region in East China has become prone to soil acidification, which changes heavy metals such as copper(Cu) in soil into water-soluble species and increases the mobility and contamination risks of heavy metals in the biological environment. In this study, the kinetics of Cu2+sorption by the bulk soil and the aggregate size fractions of an acidic paddy soil collected from the Taihu Lake region, the effects of temperature on Cu2+sorption, and the p H changes of the solution were investigated by static sorption and magnetic stirring. The aggregate size fractions were prepared by low-energy ultrasonic dispersing and freeze-drying. The total sorption amounts of the bulk soil and the aggregate size fractions for Cu2+followed a descending order of clay > coarse sand > bulk soil > silt> sand, corresponding to those of organic matter content, free iron oxide content, free aluminum oxide content, and cation exchange capacity. The kinetic sorption curves of Cu2+by the bulk soil and the aggregates, which were divided into two stages(rapid and slow sequentially), were well fitted by the first-order equation, the diffusion equation, and the Elovich equation, showing significant correlations(P < 0.05). Specific and non-specific sorption dominated in the fast and slow stages, respectively, and the former was predominant throughout the sorption process. The specific sorption accelerated and the non-specific sorption decelerated with rising temperature. The p H of the solution decreased significantly during the specific sorption and remained unchanged or increased slightly during the non-specific sorption. When the specific sorption terminated, the p H of the solution was minimized nearly simultaneously.The sorption progress of Cu2+by the bulk soil significantly preceded that by the aggregates. Therefore, heavy metal contamination may be another factor reducing soil p H and metal sorption forms should be taken into consideration in studies of mitigating soil heavy metal pollution or determining environmental capacity of heavy metal in soil.  相似文献   

9.
LU Sheng-Gao 《土壤圈》2001,11(2):185-188
The role of organic matter in the formaiton and stability of soil aggregates in mulberry plantation in the Hang-Jia-Hu Plain,northern Zhejiang Province,was evaluated in this study,A positive correlation was found between water-stable aggregate contents and organic matter contents in the ulberry plantation soils,which supported the hypothesis that organic matter was the main eenting agent in formation of aggregates.A close correlation was also foud between statility ofaggregate ad organic matter contents.Regression analysis showed that total nitrogen content was also an idicator of water-stable aggregate content and stability.The aggregate size distribution indicated that the water-stable aggregats 1-0.25mm in diaeter with the decreast of aggregate sizes,and the aggregates 1-0.25mm in diameter had the maximum organic matter content.  相似文献   

10.
The quantification of phosphorus(P) in bulk soil and P distribution in different size fractions of water-stable aggregates(WSAs)are important for assessing potential P loss through runoff. We evaluated available and total P distribution within WSAs of a sitty clay to clay soil in a long-term fertility experiment of a rice-wheat cropping system in India. Surface soil samples were collected from seven plots amended with NPK fertilizers in combination with or without organic amendments, farmyard manure(FYM), green manure(GM), and paddy straw(PS). The plot with no NPK fertilizers or organic amendments was set as a control. The soil samples were separated by wet sieving into four soil aggregate size fractions: large macroaggregates( 2.0 mm), small macroaggregates(0.25–2.0 mm), fine microaggregates(0.05–0.25 mm), and a silt + clay-sized fraction( 0.05 mm). Structural indices were higher in the soil receiving organic amendments than in the soil receiving inorganic fertilizer alone. Organically amended soil had a higher proportion of stable macroaggregates than the control and the soil receiving inorganic fertilizer alone, which were rich in microaggregates. Total and available P contents within WSAs were inversely related to the aggregate size, irrespective of treatment. The distribution of available and total P in the soil aggregate size fraction was as follows: silt + clay-size fraction small macroaggregates fine microaggregates large macroaggregates. Within a size class, aggregate-associated available and total P contents in the organically amended soil were in the following order: FYM PS ≥ GM. The available P content of the microaggregates( 0.25 mm) was 8-to 10-times higher than that of the macroaggregates( 0.25 mm), and the total P content of the microaggregates was 4-to 5-times higher than that of the macroaggregates. Cultivation without organic amendments resulted in more microaggregates that could be checked by the application of organic amendments such as FYM and GM, which increased the proportion of water-stable macroaggregates by consolidating microaggregates into macroaggregates.  相似文献   

11.
鄂南第四纪粘土红壤团聚体的稳定性及其稳定机制初探   总被引:12,自引:1,他引:11  
用湿筛法和LeBissonnais法研究了鄂南第四纪红粘土母质发育的两种侵蚀程度的红壤团聚体的稳定性,并且分析了影响供试土壤团聚体稳定性的土壤性质。结果表明,轻度侵蚀的耕作土壤团聚体的稳定性较低,在水的作用下易崩解成较小粒径的水稳性团聚体;强度侵蚀的土壤表层团聚体的稳定性较高,崩解后产生较多的水稳性大团聚体。引起土壤团聚体破坏的主要作用机制是土壤团聚体中的闭蓄空气爆破引起的消散作用;研究区第四纪红壤团聚体的主要胶结物质是土壤中的粘粒、游离氧化铁铝和无定形铁。由于供试土壤中有机质含量很低,在本研究中,有机质含量与土壤团聚体稳定性之间没有显著正相关关系。  相似文献   

12.
Primary particle size distribution (PSD) of eroded sediment can be used to estimate potential nutrient losses from soil and pollution hazards to the environment. We studied eroded sediment PSDs from three saturated soils, packed in trays (20 × 40 × 4 cm), that had undergone either minimal aggregate slaking (MAS) or severe aggregate slaking (SAS) prior to a 60 mm simulated rainstorm (kinetic energy, 15.9 kJ m−3; droplet diameter, 2.97 mm) and collected runoff at regular intervals. The degree of aggregate slaking was controlled by the rate at which soils were wetted to saturation. The PSDs of eroded materials and of parent soils were determined using a laser particle size analyser. For each soil, PSD frequency curves of eroded sediments and parent soils were generally of a similar shape but most eroded sediments had larger clay contents than their parent soils. In the SAS treatment, cumulative clay enrichment in the eroded materials was inversely related to the parent soil clay content, these being 28.5, 26.6 and 22.8% richer in clay than their parent soils for the loam, sandy clay and clay, respectively. Generally, total clay loss was greater from soils with SAS than from those with MAS because of erosion rates; however, clay enrichment of sediments, compared with parent soil clay contents, was mostly greater in samples with MAS. Greater clay enrichment took place during the early seal development stage in the loam, but could not readily be associated with specific stages of seal development for the clay. In the sandy clay, the relation between seal development and clay enrichment in the eroded material depended on the initial degree of aggregate slaking. The observed large preferential loss of clay by erosion in cultivated soils re-emphasizes the need to employ erosion control measures.  相似文献   

13.
前期土壤含水率对红壤团聚体稳定性及溅蚀的影响   总被引:13,自引:6,他引:7  
为了探究前期含水率对南方红壤团聚体稳定性及溅蚀的影响,选取泥质页岩和第四纪红黏土发育的4个典型红壤为研究对象,就5个前期含水率(3%、5%、10%、15%、20%)条件下3~5 mm团聚体水稳定性特征及其与溅蚀的关系进行了初步的探讨。结果表明,消散作用是团聚体破碎最有效的机制,土壤前期含水率越大,团聚体破碎程度越小。随着前期含水率的升高,泥质页岩发育的2种红壤水稳性团聚体平均质量直径(MWDwa)显著增大;第四纪红黏土发育的2种红壤水稳性团聚体平均质量直径(MWDwa)先增大后减小,拐点出现在含水率为15%条件下。泥质页岩发育2种红壤溅蚀量随前期含水率的升高显著减小;第四纪红黏土发育2种红壤溅蚀量随前期含水率的升高呈现先减小后增大的趋势,在含水率为15%时达到最小。团聚体水稳性较高的土样,溅蚀粒径分布呈双峰曲线分布,主要分布1~0.5和0.05 mm范围内,且前期含水率越高,0.05 mm溅蚀颗粒含量越大;而团聚体水稳定性较差的土样,除前期含水率为20%外,溅蚀粒径分布呈单峰曲线分布,主要分布在0.25~1mm。该结果为红壤区农业水土工程及机侵蚀机理研究提供一定的参考,对完善坡面水蚀模型具有一定的参考价值。  相似文献   

14.
通过野外采样和室内分析相结合,以广东省赤红壤区花岗岩(G)、第四纪红土(Q)和砂页岩(S)母质发育的林地(FL)、水田(PF)和旱地(UL)土壤为研究对象,分析了土壤团聚体有机碳及其组分和不同形态铁氧化物含量,探究了其对土壤团聚体稳定性的影响及贡献。结果显示:(1)3种母质发育的3种利用方式土壤团聚体均以>0.25 mm为主,2~5 mm团聚体以花岗岩母质发育林地土壤最高(58.51%),0.25~2 mm团聚体以花岗岩(62.93%)和第四纪红土(59.21%)母质发育水田和旱地土壤最高;土壤团聚体平均重量直径(MWD)和几何平均直径(GMD)以砂页岩母质发育林地土壤最高;(2)3种母质发育林地土壤团聚体有机碳及其组分主要分布在2~5 mm粒径中,水田和旱地土壤团聚体有机碳及其组分主要分布在<0.053 mm粒径中;3种母质发育林地土壤团聚体铁氧化物含量主要分布在<0.053,0.25~2 mm粒径中,水田和旱地土壤团聚体铁氧化物含量主要分布在<0.053 mm粒径中。(3)相关分析和主成分分析表明,MWD、GMD与团聚体HAC、HAC/FAC、Fe fr和Fe co呈显著相关(P<0.05);不同母质和利用方式以砂页岩母质发育的林地土壤团聚体胶结能力最好。研究表明,不同母质和利用方式土壤团聚体HAC、HAC/FAC、Fe fr和Fe co含量分布差异显著,进而影响了土壤团聚体分布和稳定性,同时砂页岩母质发育的林地土壤团聚体结构较稳定。  相似文献   

15.
Aggregate breakdown due to rainfall action causes crusting and interrill erosion. Erodibility is seemingly determined by the capacity of surface aggregates to resist the effects of rainfall. In this paper, we evaluated the relevance of an aggregate stability measurement, which comprises three treatments, in order to characterize aggregate breakdown dynamics. Two cultivated soils were studied: a clay loam slightly sensitive to erosion and a more susceptible silt loam. We compared the size distributions of microaggregates produced by the three aggregate stability treatments with the results from a rainfall simulation. The behaviour of four initial aggregate size classes (< 3 mm, 3–5 mm, 5–10 mm and 10–20 mm) was also compared to study the influence of the initial aggregate size on the nature of resulting aggregates. The mean weight diameter was from 200 to 1400 µm for the silt loam and from 600 to 7000 µm for the clay loam. The two experiments – aggregate stability measurements and aggregate breakdown dynamics under rainfall – yielded similar results. Qualitative analysis showed that for both soils the sizes of fragments produced by breakdown with the aggregate stability tests and under rainfall were similar and seemed to be qualitatively independent of the size of initial aggregates. We first schematized the structural organization of aggregates in cultivated horizons with a simple hierarchical model at two levels: (i) < 250 µm microaggregates and (ii) > 250 µm macroaggregates made by the binding together of microaggregates. We then developed a model of aggregate breakdown dynamics under rainfall which gives, for various rainfall durations, the size distributions of resulting fragments on the basis of aggregate stability measurements. We obtained a correlation coefficient, r, of 0.87 for the silt loam and of 0.91 for the clay loam, showing that the experimental and predicted mass percentages were linearly related for each size fraction.  相似文献   

16.
降雨过程中红壤表土结构变化与侵蚀产沙关系   总被引:12,自引:1,他引:11  
通过人工模拟降雨和表土微形态观测,研究了发育于泥质页岩、第四纪红粘土和花岗岩3种母质的红壤在降雨侵蚀过程中表土土壤结构的变化及其对侵蚀的影响。结果表明:降雨过程中,泥质页岩红壤极易形成土壤结皮,增加径流,响应结皮的形成,径流速率和含沙量较高,且迅速达到最大值,随后径流稳定而含沙量持续下降。第四纪红粘土红壤团聚体稳定,较难形成结皮,且结皮易被破坏,导致侵蚀过程中产流产沙量较低,均随降雨时间的延长而呈缓慢上升趋势。花岗岩红壤基本上不能产生结皮,粗化现象严重,因此产流量和产沙量也较低;由于土壤团聚体稳定性差以及径流的选择性运移,泥质页岩红壤和花岗岩红壤侵蚀泥沙中细颗粒(<0.02mm)含量远高于土壤中该粒径颗粒。而第四纪红壤侵蚀泥沙中粗颗粒较多,以多级团聚体的团聚体为主。  相似文献   

17.
土粒表面电场对土壤团聚体破碎及溅蚀的影响   总被引:1,自引:1,他引:0  
团聚体是土壤结构的基本单元,其稳定性是评估土壤抗侵蚀能力的重要指标。土壤团聚体破碎是降雨溅蚀发生的关键一步。土粒表面电场对团聚体稳定性具有重要影响,必然也会深刻影响降雨溅蚀过程。该文以黄土母质发育的黄绵土和塿土为研究对象,采用不同浓度的电解质溶液定量调控土粒表面电场,研究不同电场强度对团聚体破碎及溅蚀的影响。结果发现:1)随电解质浓度的降低,土粒表面电位升高,表面电场增大,黄绵土和塿土团聚体平均重量直径减小,团聚体稳定性降低,降雨溅蚀量增大。2)电解质浓度小于10-2 mol/L,黄绵土和塿土表面电位绝对值分别高于202.0和231.6 mV,此时团聚体稳定性和溅蚀量变化不明显,表明表面电位202.0和231.6 mV分别是影响黄绵土和塿土团聚体稳定性及溅蚀的关键电位。3)随着土粒表面电场的减弱,团聚体破碎后释放的<0.15 mm微团聚体含量减小,>0.25 mm大团聚体含量增加,团聚体倾向于破碎为更大粒级的团聚体。4)电场作用下团聚体的破碎特征对降雨溅蚀具有重要的影响,溅蚀量与团聚体破碎释放的<0.15 mm微团聚体含量呈显著正相关,与>0.25 mm大团聚体含量呈显著负相关。上述结果表明,当降雨进入土壤后,对于干燥的土壤而言,土壤溶液电解质浓度被迅速稀释,土粒表面产生强大的电场,该电场通过影响团聚体破碎程度进而影响降雨溅蚀。该研究有助于加深对降雨溅蚀的科学认识,同时也为土壤团聚体稳定性及降雨溅蚀的人为调控提供了一定的理论依据。  相似文献   

18.
有机质影响溅蚀破坏土壤团聚体的主要作用机制   总被引:1,自引:0,他引:1       下载免费PDF全文
土壤有机质是团聚体的重要组成部分,其在团聚体形成过程中作用机制已有大量研究,但有机质在团聚体破坏过程中起何种作用尚未明晰,其对团聚体破坏过程中雨滴机械打击和消散作用贡献的影响也有待深入研究。为研究不同有机质含量对土壤团聚体的影响,选取5种不同退耕还林年限的土壤为研究对象,利用95%酒精和超纯水作为降雨液体,分别在4个高度下(0.5、1、1.5和2 m)对其进行溅蚀试验。结果表明:随有机质含量的增加,团聚体稳定性逐渐增强,土壤对雨滴机械打击和消散作用的敏感程度越来越弱,土壤抵抗侵蚀的能力越来越强;降雨前后大团聚体数量随着有机质含量的增加逐渐趋近相似,且酒精雨滴作用下的大团聚体含量明显大于超纯水作用下的大团聚体含量;在相同的降雨动能条件下,有机质含量增加使消散作用的贡献率呈现减小的趋势,且其对消散作用的影响在降雨动能较小时较为显著。研究结果对深入理解溅蚀过程中团聚体稳定性评价以及团聚体破坏因子具有重要作用。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号