[目的]研究浙东典型森林公园地区土壤中的生物群落和有机质的变化，为改善该地区的土壤结构和提高土壤有机质含量奠定基础。[方法]在浙东典型天童国家森林公园选择林地、果园、蔬菜地和荒地这4种土地利用方式，通过湿筛法测定中间团聚体(0。25～2 mm)、微团聚体(0。053～0。25 mm)、大团聚体(＞2 mm)和粉黏粒(＜0。053 mm)有机碳含量和微生物量碳、氮含量，揭示浙东典型森林公园地区土壤有机碳库的形成格局和调控。[结果]①不同土地利用方式下各个粒级的团聚体有机碳和微生物量碳、氮的分配规律相似，均表现为:中间团聚体＞微团聚体＞大团聚体＞粉黏粒;不同土地利用方式下0-10 cm 土壤平均重量直径(MWD)和几何平均直径(GMD)均高于10-20 cm 土层，0-10和10-20 cm 土壤MWD和GMD大致表现为:林地＞荒地＞果园＞蔬菜地，其中林地和荒地差异不显著(p＞0。05)，果园和蔬菜地差异不显著(p＞0。05)，由此说明不同土地利用方式对土壤团聚体稳定性的影响主要在表层土壤。②不同土地利用方式下土壤各粒径有机碳含量趋势一致，基本表现为:大团聚体＞微团聚体＞中间团聚体＞粉黏粒，且0-10 cm 土层土壤各粒径有机碳含量均高于10-20 cm 土层，0-10和10-20 cm 土壤有机碳含量大致表现为:林地＞荒地＞果园＞蔬菜地，其中林地和荒地显著高于果园和蔬菜地(p＜0。05)，果园和蔬菜地差异不显著(p＞0。05)。③不同土地利用方式土壤各粒径微生物量碳和氮变化趋势一致，基本表现为:大团聚体＞微团聚体＞中间团聚体＞粉黏粒，且0-10 cm 土层土壤微生物量碳和氮含量均高于10-20 cm 土层，0-10和10-20 cm 土壤微生物量碳和氮含量大致表现为:林地＞荒地＞果园＞蔬菜地，其中林地和荒地显著高于果园和蔬菜地(p＜0。05)，果园和蔬菜地差异不显著(p＞0。05)。[结论]林地和荒地土壤团聚体有机碳、微生物量碳和氮高于果园和蔬菜地，由此表明林地和荒地更有利于土壤有机碳的累积，土壤固碳潜力更大。
Effects of Different Land-use Patterns on Soil Aggregate Stability and Contents of Carbon and Nitrogen
[Objective]The changes of soil biomes and organic matter in typical forest park areas of Eastern Zhejiang Province were studied to lay a foundation for improving soil structure and increasing soil organic matter content in this area.[Methods]Detecting aggregate(0.25-2 mm),micro aggregate(0.053-0.25 mm),big aggregate(＞2 mm),and powder clay(＜0.053 mm)in the content of organic carbon,microbial biomass carbon and nitrogen content,the influence of soil aggregate stability,and microbes using wet sieving method under different land utilization way of forest land,orchard,vegetable land,and waste land to provide a scientific basis for formation pattern and regulation of soil organic carbon pool.[Results]① The results showed that the distribution trend of the components of the aggregates of different soil particle sizes was consistent under different land-use patterns.The mean weight diameter(MWDS)and geometric mean diameter(GMD)of 0-10 cm soil under different land use ways were higher than those of the 10-20 cm soil layer.The MWDS and GMD of both types of soil were roughly characterized by forest land＞wasteland＞orchard＞vegetable land;forest land and wasteland showed no significant difference(p＞0.05),and neither did orchards and vegetable land(p＞0.05);this demonstrates the influence of different ways of land use on soil aggregate stability,mainly in the surface soil.② For soils under different land-use patterns,each grain size trend of organic carbon content is consistent,and the basic performance is big aggregate＞micro aggregate＞middle aggregate＞powder and clay;for the 0-10 cm soil layer,each particle's size distribution of organic carbon content was higher than that of 10-20 cm soil layer,and the organic carbon content of forest land＞wasteland＞orchard＞vegetable land for the 0-10 cm and 10-20 cm soil is significantly higher than that of forest land and wasteland orchards and vegetable land(p＜0.05),whereas orchards and vegetable land show no significant difference(p＞0.05).③ Soils under different land-use patterns of each particle size of microbial biomass carbon and nitrogen variation trend are consistent,and the basic performance is big aggregate＞micro aggregate＞middle aggregate＞powder and clay;for the 0-10 cm soil layer,the soil's microbial biomass carbon and nitrogen content were higher than those of the 10-20 cm soil layer,and the microbial biomass carbon and nitrogen content of 0-10 cm and 10-20 cm soil is generally characterized by forest land＞wasteland＞orchard＞vegetable land,significantly higher than that of forest land and wasteland orchards and vegetable land(p＜0.05),whereas orchards and vegetable land show no significant difference(p＞0.05).[Conclusion]Overall,the organic carbon,microbial biomass carbon,and nitrogen of the forest land and wasteland aggregate were higher than those of the orchard and vegetable land;thus,forest land and wasteland were more conducive to the accumulation of soil organic carbon and could promote soil carbon sequestration.
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