【摘要】 对秦岭南坡土壤肥力状况、空间分异规律及其与海拔的关系进行研究。结果表明,秦岭南坡土壤肥力指标在整个土壤剖面空间分异范围分别为:土壤pH值5·97~6·89,有机质含量6·6~50·1g·kg-1,土壤全N含量0·5~3·8g·kg-1,碱解N含量33·6~257·3mg·kg-1,速效P含量0·81~5·8mg·kg-1,速效K含量38·9~262·4mg·kg-1,粘粒含量11·3%~18·1%,阳离子代换量68·5~310·2mmol·kg;其空间分异程度以速效P、有机质和土壤全N含量较大,土壤粘粒含量和土壤pH值较小;随着土层的加深,土壤pH值、有机质、速效P、土壤粘粒含量和阳离子代换量空间分异程度减小,而土壤全N、碱解N和速效K含量空间分异程度增大。土壤速效K、速效P含量和阳离子代换量水平空间分异程度受海拔的影响较大,而土壤pH值和粘粒含量水平空间分异程度受海拔影响较小。随着海拔的升高,土壤pH值降低,有机质和速效P、K含量增大,土壤肥力空间分异程度减小,这可能与随着海拔升高人为干扰强度降低及林分类型趋向单一有关。更多还原

【Abstract】 Studied the soil fertility on south slope in Qinling Mountains,the spatial distribution and variation pattern and its relation with altitude. The results showed that the spatial distribution range of soil fertility in Qinling forest area on south slope was soil pH volue 5.97～6.89,organic matter 6.6～50.1 g·kg~-1, total N 0.5～3.8 g·kg~-1 ,available N 33.6～257.3 mg·kg~-1,available P 0.81～5.8 mg·kg~-1,available K 38.9～262.4 mg·kg~-1,clay particle content 11.3%～18.1%,capacity of exchangeable base 68.5～310.2 mmol·kg~-1 respectively; The spatial variation degree of available P, organic matter, and total N was big,whereas clay particle content and active acid pH value was small;the spatial variation degree of soil pH value, organic matter, available P, clay particle content, and capacity of exchangeable base decreased with the deep of soil,whereas soil total N、available N, and available K increased. The horizontal spatial variation degree of soil available K、available P and capacity of exchangeable base influenced much more by altitude,whereas soil pH value and clay particle content influenced less. The soil pH value decreased with the altitude, whereas organic matter and available P、K increased;The soil fertility spatial variation decreased as the altitude went up, which may have something to do with mankind disturbance strength lowering and forest type inclining to sameness.更多还原