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Effects of Tillage and Organic Materials Application on Soil Carbon Pool and Soil Aggregate Stabilization

Author: WangShengTao
Tutor: ZhangBaoGui
School: China Agricultural University
Course: Soil
Keywords: Soil aggregates Variable ten soil carbon pool Hot water soluble soil carbon Soil carbon management index Path Analysis
CLC: S158
Type: Master's thesis
Year: 2005
Downloads: 578
Quote: 4
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Abstract


Different land use and soil management practices on soil organic carbon and soil aggregates affected differently. This study analyzes the original forest in Xishuangbanna, Yunnan and Guangdong Yingde shed tea, the tea to 30 years (frequent deep plowing, manure was applied) and the nearby grassland, 30 tea growing areas (small shallow plowing, manure was applied ) and near the bamboo floor surface and deep soil samples were sieved with a wet sieve method of each class of water-stable soil aggregates, soil aggregates were measured and calculated the geometric mean diameter, levels of quality aggregates percentage of soil organic carbon, total soil organic carbon stocks and their upper and lower level ratio and the total sample were measured microbial biomass carbon, hot water soluble carbon, total organic carbon and basal respiration and other indicators, quantitative analysis of these soils Property of soil aggregate stability contribution. The main results are as follows: 1, large diameter class (10-2mm) soil aggregates and the corresponding mass percentage of organic carbon levels and soil carbon storage volume between libraries there was a significant positive correlation. 2, the water-soluble carbon soil heat labile soil carbon pool as a major part of the microbial biomass and activity, mineralization of soil organic carbon, total organic carbon content of the soil was significantly correlated (n = 56, p lt; 0.001); 3, soil carbon management index (CMI) better reflects the way in different management levels of soil organic carbon dynamic changes. 4, through path analysis results soluble carbon soil thermal stability of soil aggregates is a key substance; constantly transformed by microorganisms in soil organic carbon, hot water soluble soil carbon pool is the main supplementary source; soil organic carbon is mainly through conversion for the hot water soluble carbon approach to the stability of soil aggregates contribute. Pink clay content of soil and soil pH on the stability of aggregates is negligible. 5, the upper levels of tillage on soil water-stable soil aggregates distribution and soil organic carbon storage have a greater impact, especially level is greater than 2mm in diameter large proportion of aggregates and organic part of changes in carbon stocks bigger. High soil aggregates geometric mean diameter represents the upper and lower layers of soil disturbed than smaller, but with roots in grassland soils on the distribution level. The results showed that soil carbon and hot water soluble carbon management index (CMI) and the geometric mean diameter of soil aggregates compared to the upper and lower levels of human disturbance sensitive to changes, can better reflect the condition of soil nutrient and soil physical properties, it can be used as good indicators of soil quality assessment.

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil fertility (soil fertility )
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