摘要
本文研究了内蒙古白音锡勒牧场地区天然割草场割草对生物量、植物含N量及对土壤水分、营养元素含量的影响。研究结果表明,在割草的影响下,群落地上生物量和密度逐年波动式地下降,优良牧草的比例减少,杂类草增加。群落的地下生物量也下降。一些生态因子如土壤水分和营养物质的含量也受到割草的影响。根据对单位面积上的储N量变化分析,提出最适割草时期(8月中旬)和合理的轮割制度(割一年休一年)。
A reasonable mowing system of the natural mowing steppe in Baiyinxile farm was studied. The results showed that according to N-elcment reserves per unit area, the optimum mowing period was in the middle August, and the rational rotation mowing system consisted of a year moving and the next year stopping. Under the influence of mowing, the above-ground bio-mass and density of the community decreased in a way of fluctuation year b year. The number of the fine forage grasses decreased while the forbs were being increased. The under-ground biomass of the community declined, too.Some ecological factors such as soil water content and soil nutritious substance were also influenced by mowing.
出处
《生态学报》
CAS
CSCD
北大核心
1991年第3期242-249,共8页
Acta Ecologica Sinica
基金
国家自然科学基金
关键词
合理轮割制度
天然草场
割草时期
optimum mowing Period, rational rotation mowing system, N-element reserves per unit area.
