不同禁牧时间对典型草原净初级生产力的影响  

Effects of Different Non-grazing Periods on the Net Primary Productivities of the Typical Steppes

作　　者：许晴[1] 王英舜[2] 许中旗[3] 李文华[4] 

机构地区：[1]河北农业大学动物科技学院,河北保定071000 [2]内蒙古锡林浩特国家气候观象台,内蒙古锡林浩特026000 [3]河北农业大学林学院,河北保定071000 [4]中国科学院地理科学与自然资源研究所,北京100101

出　　处：《中国草地学报》2011年第6期30-34,共5页Chinese Journal of Grassland

基　　金：国家自然科学基金重点项目(30230090)

摘　　要：为了研究禁牧对典型草原生产能力的影响,对在不同时间采取禁牧措施的典型草原的生物量和净初级生产力进行了研究。结果表明,禁牧有利于生物量的提高,而且禁牧时间越长,生物量越高,禁牧17年、7年、2年以及放牧草原的生物量分别为3771.69g/m2、3248.33g/m2、2711.06g/m2和2348.50g/m2。草原生态系统地下生物量明显高于地上。3种禁牧草原的净初级力普遍高于放牧草原,分别为后者的1.23(禁牧2年)、1.20(禁牧7年)和1.08倍(禁牧17年),但是净初级生产力并不随禁牧时间的增加而增加。典型草原物质价值由高到低的顺序为:禁牧17年(1011.68元/hm2.a)>禁牧7年(600.32元/hm2.a)>禁牧2年(521.52元/hm2.a)>放牧草原(301.28元/hm2.a)。以上结果表明,禁牧对典型草原的净初级生产力及生物量有明显影响,采取禁牧措施有利于典型草原生产能力的恢复。In order to understand the effects of non-grazing on productivities of typical steppes, the hiomass and NPP（net primary productivities） of typical steppes with different non-grazing periods were stud- ied. The results showed that non-grazing led to higher biomass, and the longer the period of non-grazing was, the higher the biomass was. The biomass was 3771. 69g/mz after non-grazing for 17 years, 3248.33g/m2 after non-grazing for 7 years, 2711.06g/mz after non-grazing for 2 years, 2348.50g/m2 for grazing. For the typical steppe,the underground biomass was higher than aboveground. The NPP of three types of non-grazing steppes were higher than the grazing one, and the formers were 1.23 times, 1.20 times, 1.08 times as much as the latter respectively. The production valuation was ranked in descending order as follows： non-grazing for 17 yrs （1011. 68yuan/hm2·a） non-grazing for 7 yrs （600.32yuan/hm2 · a）〉 non-grazing for 2 yrs （521.52yuan/hm2· a）grazing（301.28yuan/hm2· a）. It is concluded that non-grazing affects the NPP and biomass of steppes remarkably, and non-grazing can lead to the restoration of production ability of steppes.

关 键 词：典型草原 禁牧 生物量 净初级生产力 

分 类 号：S812.8[农业科学—草业科学]