Dissertation
Dissertation > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil and Water Conservation

A Study on the Relationship of between Soil Humus and Anti-erosion Ability of Soil Aggregate

Author NingLiDan
Tutor ShiHui
School Southwest China Normal
Course Physical Geography
Keywords Soil humus Humic acid Fulvic acid Soil aggregates Resistance to erosion
CLC S157
Type Master's thesis
Year 2005
Downloads 383
Quotes 3
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In the soil humus , the humus components directly contribute to the formation of soil fertility and aggregates . Soil aggregates is an important indicator of the identification of soil fertility , the size and content of the physical properties of soil , soil quality level of the main indicators of the strength of resistance to erosion . In order to find the composition of soil humus impact on soil erosion resistance , especially the study in order to find the process of soil erosion the humus mechanism at the same time , can also reduce soil erosion to provide effective theoretical basis . In this paper, the Wolong Nature Reserve in dark coniferous forest , mixed coniferous dark coniferous forest , bamboo forests , Quercus four vegetation types of the quantitative characteristics of the soil aggregates and humus characteristics analysis, and results show that : (1 ) from the soil profile , due to the cumulative effect of surface organisms , higher humus content of the soil surface , humus content decreased with increasing soil depth ; various components of the humus , humic acid content with soil depth and gradually become less and fulvic acid content increased gradually deepen the depth of the soil layer ; surface soil HA / FA value addition to Quercus soil is greater than 1 , and the second , three soil HA / FA value less than 1. (2 ) soil aggregates obey the lognormal distribution , a negative relationship between the geometric mean diameter and geometric standard deviation , mixed coniferous and Quercus soil, and has a larger diameter of the aggregates . The four vegetation , soil fractal dimension range between 2.40 to 2.78 , < 0.25mm aggregates content is higher, the greater the fractal dimension of soil aggregates ; 12 samples in the second layer of dark coniferous forest soil the bamboo understory soil layer of dark coniferous forest window fractal dimension , indicating that the worst of their structure . (3 ) The probability of preservation of soil aggregates in four vegetation conditions are basically 3 ~ 1mm, 1 ~ 0.5mm particle size class reunion save big chance , the possibility of the destruction of ; > 10mm, 0.5 ~ 0.25mm tablets

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