摘要
在羊草草原上模拟了枯枝落叶的积累,测定了它对地表温度、土壤水份和土壤pH值三个主要生态因子的影响。结果表明,枯枝落叶可以使地表温度在5～9月份平均下降5～6℃,土壤含水量增加1.5倍,pH值从11下降到7.2。在综合考虑枯枝落叶对这三个生态因子的影响后,根据优化理论,提出了枯枝落叶最佳积累量模型,在羊草草原上的最佳积累量为每平方米570克。
The accumulation of litter was simulated in Leymus chinensis grassland. The influences of litter on surface temperature, soil water and soil pH were measured. Experimental results showed that litter can make surface temperature fall 5～6℃ in the period from May to Sept, soil water increase 1.5 times and the pH drop down from 11 to 7.2. Aecording to theory of optimization, the mathematic model for determining the optimal amount of litter was put forward on the basis of giving sythetic consideration to the three ecological factors. The optimal amount of litter determined by the model is about 570g/m^2 in Leymus chinensis grassland.
出处
《中国草地》
CSCD
1989年第6期17-20,共4页
Grassland of China
