芨芨草草丛肥岛特征

论文通过对祁连山区芨芨草草丛肥岛特征研究,结果表明:①芨芨草草丛肥岛冠幅下土壤养分高于空地。②土壤有机质、 全氮、 全磷、 速效氮、 速效磷、 速效钾、 速效锌、 速效锰和速效铁含量从草丛中心到距草丛边缘100 cm变化的整体规律是先减小后增加;但距草丛边缘100 cm含量低于草丛中心。③土壤全钾含量、 pH值和速效铜含量从草丛中心到距草丛边缘100 cm变化规律为:全钾含量在各土层变化各异;pH值变化0~10 cm和10~20 cm土层升高,20~30 cm土层则降低;速效铜含量0~10 cm和10~20 cm土层持续下降,20~30 cm土层先减小后增加,并在距草丛边缘40 cm含量最低。总体而言,芨芨草草丛肥岛的各种土壤养分变化规律不是完全一致的。

Characteristics of Achnatherum splendens Tussock Fertile Island

The Achnatherum splendens tussock fertile island was studied in Qilian Mountains. The results showed that: 1) The soil nutrient in the crown width of Achnatherum splendens tussock was more than that in the tussock gap. 2) A common variation pattern was found that the some soil nutrient contents, including organic matter, total nitrogen, total phosphorus, available nitrogen, available phosphorus, available potassium, available zinc, available manganese and available iron, decreased firstly and then increased along with the distance from the centre of tussock to the edge of tussock. 3) Other soil indices showed their own variation pattern: Total potassium content varied in different soil layers; pH value increased within 0-10 cm and 10-20 cm layers, and decreased within 20-30cm layer. Available copper content continuously decreased within 0-10 cm and 10-20 cm layers, and firstly decreased and then increased in 20-30 cm. Generally, the variation pattern of soil nutrient in Achnatherum splendens tussock varied in terms of different nutrients or properties.