草牧场防护林对草地地上生产力和地下生物量的影响  

Effect of Pastureland Shelterbelt on Aboveground Productivity and Underground Biomass

作　　者：李永华[1,2] 杨文斌[1,2,3] 卢琦[1,2] 王利兵[1] 王学全[1,2] 

机构地区：[1]中国林业科学研究院林业研究所／国家林业局林木培育重点实验室,北京100091 [2]中国防治荒漠化研究与发展中心,北京100091 [3]内蒙古林业科学研究院,内蒙古呼和浩特010010

出　　处：《中国草地学报》2008年第5期85-89,共5页Chinese Journal of Grassland

基　　金：国家科技支撑计划项目(No.2005BA517A07/No.2006BAD26B01)

摘　　要：通过对内蒙古四子王旗20世纪70年代营造的人工白榆草牧场防护林及其林下和周边草地的研究表明,草地优势种羊草和克氏针茅的地上生产力组成比例,背风面一侧(62.4±5.7%)>林内(36.1%)>迎风面一侧(28.0±7.4%)。地上生产力平均值(林内生产力为林木与草地生产力之和),林内(3873kg/hm2)>背风面一侧(1769±177kg/hm2)>迎风面一侧(1588±47kg/hm2)。回归分析表明,背风面一侧群落的地上生产力随离开防护林距离的增加而增加(R2=0.97,P<0.001);而迎风面一侧群落地上生产力与离开防护林的距离没有呈现明显的规律性。对地下生物量的研究表明,草地地下生物量主要分布在距离地表10cm土层中(约86%),随离开防护林距离的增加根系垂直分布有向地表聚集的倾向。The effect of pastureland shelterbelt on aboveground productivity and underground biomass in Siziwang county, Inner Mongolia was studied. The results indicated that the average ratios of the domi- nant grass species above--ground productivity （Stipa krylovii and Leymus chinensis in 13 grassland plots） to total grassland above-- ground productivity decreased orderly in leeward （62. 4 ± 5.7%）, under forest （36. 1%） and windward （28. 0q-7.4%）. The order of average aboveground productivity for windward, cultivated forest land and leeward grasslands was： forest productivity （3873 kg/hm^2, including under forest grassland and forest productivity）〉 leeward grasslands （1769± 177 kg/hm2 ）〉 windward grasslands （1588±47 kg/hm^2）. With increasing distance from cultivated forest to the plots, the aboveground productivity of leeward grasslands increased with increasing the distance （R^2 =0. 97,p〈0. 001）, however, the aboveground productivity of windward grasslands didn＇t show obvious relationship with the distance. The underground biomass was mostly distributed in the 10cm in depth from the earth＇s surface （about 86%）. With increasing distance from cultivated forest to plots, the roots of grass tend to the soil surface.

关 键 词：四子王旗 草牧场防护林 地上生产力 地下生物量 

分 类 号：S812[农业科学—草业科学]