子午岭林区典型植被下土壤结构及稳定性指标分析  

Analysis of Soil Structure and Its Stability Indexes Under Typical Vegetation in Ziwuling Forest Area

作　　者：梁向锋[1] 赵世伟[1] 华娟[1] 张扬[1] 

机构地区：[1]中国科学院水利部水土保持研究所

出　　处：《水土保持通报》2008年第3期12-16,22,共6页Bulletin of Soil and Water Conservation

基　　金：国家“十一五”科技支撑计划课题(2006BCA01A07;2006BAD09B08)

摘　　要：运用分形理论,研究了子午岭林区5种天然次生植被(以6 a天然恢复弃耕地为对照)下土壤结构特征,分析了土壤水稳性团聚体分维、孔隙分维、平均重量直径等3个指标在描述土壤结构稳定性方面的差异。研究表明,相对于弃耕地,各个植被群落均能明显改善土壤结构,降低土壤水稳性团聚体分形维数,提高孔隙分形维数,增强土壤结构的稳定性。土壤水稳性团聚体分维、孔隙分维与>0.25 mm水稳性团聚体含量、土壤有机碳、容重的相关系数均达到了极显著水平,均能作为评价土壤结构稳定性的指标;而团聚体平均重量直径与土壤有机碳含量、容重相关性不显著,只与>5 mm团聚体含量和>0.25 mm团聚体含量有极显著正相关关系,因此,仅可作为大团聚体含量的评价指标。Based on the fractal area were studied on contrast theory, soil fractal features of five types of vegetation in the Ziwuling forest to the 6-year abandoned farmland. Results show that the aggregate fractal dimension, the pore fractal dimension, and the mean weight diameter of aggregates can indicate soil structure stability. The aggregate fractal dimension and pore fractal dimension are highly correlated to the content of 〉 0.25 mm aggregates, the content of soil organic carbon, and soil bulk density. So they can be used as the indexes to evaluate soil structure stability. The mean weight diameter does not have significant correlations with the content of soil organic carbon and soil bulk density and however, it has significantly positive correlations with the content of 〉 0.25 mm aggregate and the content of 〉 5 mm aggregates. The mean weight diameter can only be used as the index to evaluate the content of large soil aggregates. As contrasted to the abandoned farmland, soil structure is improved under other four types of vegetation.

关 键 词：土壤结构 稳定性指标分析 子午岭林区 

分 类 号：S152.4[农业科学—土壤学]