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呼伦贝尔典型退化草原土壤理化与微生物性状

林璐1,2,乌云娜2**,田村宪司3,霍光伟1,2,雒文涛4,5,吕建洲1   

  1. (1辽宁师范大学生命科学学院, 辽宁大连116029; 2大连民族学院环境与资源学院, 辽宁大连116605; 3筑波大学大学院生命环境科学研究科, 日本茨城3058572; 4中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室, 辽宁沈阳 110164; 5中国科学院大学, 北京100049)
  • 出版日期:2013-12-18 发布日期:2013-12-18

Variation of soil physicochemical and microbial properties in degraded steppes in Hulunbeir of China.

LIN Lu1,2, WU Yun-na2, KENJI Tamura3, HUO Guang-wei1,2, LUO Wen-tao4,5, LU Jian-zhou1   

  1. (1College of Life Science, Liaoning Normal University, Dalian 116029, Liaoning, China; 2College of Environmental and Resource Sciences, Dalian Nationalities University, Dalian 116605, Liaoning, China; 3Graduate School of Life and Environmental Sciences, University of Tsukuba 3058572, Japan; 4State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; 5University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-12-18 Published:2013-12-18

摘要:

以内蒙古克鲁伦河流域呼伦贝尔典型草原为对象,设置了轻度、中度和重度退化3种类型样地,研究不同程度退化草原的物种组成、地上生物量、土壤理化性状、土壤微生物数量和酶活性,以及微生物生物量的变化.结果表明: 中度退化样地的群落物种丰富度最大,轻度退化样地的地上生物量显著高于重度退化样地.退化样地的土壤水分、养分(有机质、全氮),微生物量碳、氮,以及微生物数量和酶活性显著下降,土壤容重显著增加.退化样地的土壤微生物生物量碳、氮在128~185和5.6~13.6 g·kg-1,土壤脱氢酶和脲酶活性均与土壤容重呈显著负相关,与土壤全氮、有机质、微生物数量以及微生物生物量碳、氮呈显著正相关,地上生物量与土壤细菌和真菌数量呈不同程度的正相关.
 

Abstract: To investigate the influence of degradation on grassland, we sampled soil and plants at three sites respectively under light, moderate and severe degradation in Hulunbeir Grassland in northern China and analyzed the differences and relationships among soil physicochemical characters, enzyme activity, soil microorganism quantity and aboveground biomass. The results showed that species richness of the moderately degraded site was highest while the aboveground biomass at the lightly degraded site was significantly higher than at the severely degraded site. Soil moisture content, nutrients (organic matter and total nitrogen) concentrations, soil microorganism quantity and enzyme activity were all decreased significantly in the degraded sites, whereas both the soil hardness and bulk density showed an opposite trend. The soil microbial biomass carbon and nitrogen contents ranged from 128 to 185 g·kg-1 and from 5.6 to 13.6 g·kg-1, respectively. The soil dehydrogenase and urease activities negatively correlated with soil bulk density but positively correlated with total nitrogen, organic matter, microbial biomass carbon and nitrogen. The aboveground biomass showed significantly positive correlation with the number of soil bacteria and fungi.