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为了研究草本植物生长发育对土壤团聚体稳定性的影响,利用盆栽试验和Le Bissonnais法中的慢速湿润法研究了不同植被生长发育对土壤团聚体平均重量直径(MWD)的影响。试验设计包括4种盆栽方式处理(冰草、高羊茅、紫花苜蓿和空白对照),设计的试验天数分别为90 d、130 d、220 d和250 d。研究结果表明,三种草被的地上生物量和地下生物量皆随植被生长时间的增加而显著增加。在250 d的盆栽试验条件下,空白对照的土壤团聚体MWD基本无变化,而冰草和紫花苜蓿处理下的MWD在250 d生长期呈显著的增加趋势,高羊茅处理的MWD与空白对照处理相同。相关分析表明,草被生长时间、地上生物量、地下生物量和土壤有机质与团聚体MWD均为正相关,而除冰草的生长时间和地下生物量与土壤团聚体MWD呈显著相关外,其他各因素与MWD相关性均没达到显著水平,同时说明在本试验条件下,草被生长时间和植被种类是影响土壤团聚体稳定性的重要因素。
In order to study the effect of the growth and development of herbs on the stability of soil aggregates, the effects of different vegetation growth on the average weight diameter (MWD) of soil aggregates were studied by pot experiments and slow wetting method in Le Bissonnais method. The experiment design included four kinds of potted treatments (Agropyron, Tall Fescue, Alfalfa and blank control), and the design test days were 90 d, 130 d, 220 d and 250 d, respectively. The results showed that the aboveground biomass and underground biomass of three grasslands increased significantly with the growth of vegetation. Under 250 days of pot experiment, the MWD of the soil aggregates in the blank control basically remained unchanged, while the MWD of the grass and alfalfa treatments showed a significant increase in the 250-day growth period. The MWD of the tall fescue was significantly lower than that of the blank control The same treatment. Correlation analysis showed that grass growth time, aboveground biomass, belowground biomass and soil organic matter were positively correlated with aggregate MWD, while growth time and underground biomass of soil were significantly correlated with soil aggregate MWD The correlation between each factor and MWD did not reach a significant level. At the same time, under the conditions of this experiment, the growth time of grass and vegetation types were the important factors affecting the stability of soil aggregates.