青海省东部山区旱作农田土壤团聚体特征研究

比较了青海省东部山区垂直梯度分布的三种旱作农田土壤(黑钙土、栗钙土、灰钙土),在0~60 cm土层的不同粒级土壤风干团聚体和水稳性团聚体含量间的差异,并结合其它土壤质量指标(有机质、粘粒)对不同土壤结构和抗侵蚀能力进行了综合评价。结果表明,>0.25mm风干团聚体、>0.25mm水稳性团聚体含量和土壤有机质含量与土壤类型间有密切关系。均表现为黑钙土>栗钙土>灰钙土。黑钙土和栗钙土的土壤有机质含量与>0.25mm水稳性团聚体间存在显著正相关关系(P<0.05),灰钙土则无明显相关性;三种土壤粘粒含量与>0.25mm风干团聚体和0.25mm水稳性团聚体含量间无明显相关性。各项指标综合比较,三种土壤抗侵蚀能力大小为:黑钙土>栗钙土>灰钙土。

Characteristics of Aggregates of Arid Soil in Eastern Mountain Area of Qinghai

The differences of soil air-dried aggregates,waterstable aggregates and some soil quality indicators(soil organic matter,clay) among three arid soil(chernozems,castanozems,sierozem) in 0-60 cm soil depth in Qinghai province were compared in this paper.The result showed that the content of >0.25mm air-dried aggregates,>0.25mm water-stable aggregates,clay and SOM was related to the soil type closely.The content of clay and SOM appeared to be positively correlated with that of >0.25 mm air-dried aggregates and water-stable aggregates,and furthermore,clay content was negatively correlated with the rate of aggregates destruction.According to the results of above all,the ability of anti-erosion in the soil was found to be of the order: chernozems >castanozems>sierozem.