不同植物群落对土壤主要营养指标的影响  

The effect of plant communities on main soil nutrition

作　　者：王国生 温洪 高占琪 刘彦江 景和平 冯建山 陆飒 张洁 

机构地区：[1]甘肃省草原技术推广总站,甘肃兰州730030 [2]定西安定区种草站,甘肃定西743000

出　　处：《草业科学》2009年第11期93-96,共4页Pratacultural Science

基　　金：世界银行/全球环境基金项目(052456CHA)

摘　　要：定点取样测定黄土高原丘陵沟壑区（定西安定区）天然草原和种植红豆草Onobrychis viciae folia、小麦Triticum aestivum、马铃薯Solanum tuberosum土壤的几项主要营养指标。结果表明：在0～20cm土层中，天然草地土壤含水量最高，较红豆草、小麦和马铃薯土壤含水量高5．6％～21．8％。差异显著或极显著；种植2年红豆草的草地土壤全氮含量达到1367mg／kg．高于其他植物群落的土壤相关指标．且建植2年红豆草土壤指标高于当年建植的红豆草．差异显著；不同植物群落有效磷含量差异不显著；各类型土壤在4月、6月和8月的有机质和有效磷含量呈现不同的变化趋势，土壤pH值变化平稳。Soil nulrition of a natural grassland and three field cropped sainfoin, wheat and potato was assayed in the hills and dongas area of Loess Plateau in Anding District, Dingxi City. The results showed that soil water content in the natural grassland in the 0-20 cm soil layer increased by 5.6%- 21.8% than that of the crop lands （P〈0.05 or P〈0.01）, Total nitrogen content in the two years sainfoin soil was up to 1 367 mg/kg,which was higher than the 1--years sainfoin soil, and other soil （P〈0.05）. Effective phosphor content varied in different soil but difference did not significant. Organic matter and phosphor in each soil varied with the same trend from April to June and August, however, pH changed very little.

关 键 词：黄土高原 植物群落 土壤养分 

分 类 号：S812.2[农业科学—草业科学]