家畜生态学报2017，Vol.38Issue(3)：61-66,6.
不同放牧强度下祁连山东段草地生态系统氮磷计量特征
Metrological Characteristics of Nitrogen and Phosphorus in Grassland Ecosystem under Different Grazing Intensity in East of Qilian Mountain
摘要
Abstract
The study on stoichiometric characteristic and balance of nitrogen and phosphorus were conducted in east of Qilian mountain on the Qinghai-Tibet plateau to explore technology on the livestock management and evaluation of alpine grassland health.The grazing intensity was set according to watering place distance,ie,the relatively heavy grazing intensity (300 meters),moderate grazing intensity (1000 meters) and light grazing intensity(2000 meters).The result showed that:it was significantly lower for the species diversity and grassland biomassinheavy grazing than light grazing and moderate grazing (P＜ 0.05).The total soil phosphorus content for heavy grazing was greater than the light grazing and moderate grazing in the soil layer of 0～10 cm and 10～20 cm (P＜0.05),but moderate grazing was greater than light grazing and heavy grazing in the soil layer of 20～30 cm (P＜0.01);the total soil nitrogen content for heavy grazing was greater than the other two in the soil layer of 0～10 cm and 10～20 cm (P＜0.01),moderate grazing was greater than others in the soil layer of 20～30 cm (P=0.016).With the increase of grazing intensity,the total grass phosphorus decreased linearly (P＜0.001) and the N/P increased linearly (P＜0.001),but the total grass nitrogen was not in response to grazing intensity (P＞0.05).In addition,the retention of nitrogen in lactation yak is 27.95g/d,but the phosphorus is-1.95 g/d.In a word,it plays an important role to maintaining the grassland sustainable utilization and livestock health growth by reasonable grazing and maintaining the soil nitrogen and phosphorus balance.关键词
高寒草甸/放牧强度/化学计量/氮磷平衡Key words
Alpine meadows/grazing intensity/chemometry/nitrogen and phosphorus balance分类
农业科技引用本文复制引用
石福于,王毅,付晓悦,侯明杰,王虎成..不同放牧强度下祁连山东段草地生态系统氮磷计量特征[J].家畜生态学报,2017,38(3):61-66,6.基金项目
国家级大学生创新创业训练计划(201510730101) （201510730101）
农业部公益性行业专项(201203041) （201203041）
