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在全国杉木中心产区选择不同栽植代数 ( 1、2、3代 )、不同发育阶段 ( 5、10、15、2 0a)及不同立地 ( 14、16、18地位指数 )的杉木人工林 ,进行不同栽植代数杉木人工林土壤肥力的比较研究。结果表明 :连栽导致了杉木林地土壤肥力的明显下降 ,随栽植代数增加 ,不同发育阶段杉木林林地水稳性团聚体、非毛管孔隙、毛管孔隙、田间持水量、毛管持水量、最大持水量及土壤各项养分含量均呈下降趋势 ,而土壤结构体破坏率和容重却呈增加趋势 ,林地肥力朝不利方向发展
Cunninghamia lanceolata plantations with different generations (1st, 2nd, 3rd generation), different developmental stages (5,10,15,2 0a) and different sites (14,16,18 position index) Comparison of Soil Fertility of Different Cunninghamia lanceolata Plantations. The results showed that continuous planting resulted in a significant decrease of soil fertility in Cunninghamia lanceolata forest. With the increase of planting alluvial number, water stable aggregates, non-capillary pores, capillary porosity, field water holding capacity, capillary holding capacity, maximum water holding capacity And soil nutrient content showed a downward trend, while the soil structure destruction rate and bulk density but showed an upward trend, fertility of forest toward unfavorable direction