放牧梯度上草原植被-土壤系统碳截存特征  

Carbon Sequestration Features of Grassland Vegetation-Soil System under Different Grazing Intensities

作　　者：张雪[1] 乌云娜[1] 林璐[1,2] 赵晨羽[1] 王雪婷[1] 白佳忆 

机构地区：[1]大连民族学院环境与资源学院,辽宁大连116600 [2]辽宁师范大学生命科学学院,辽宁大连116029

出　　处：《中国沙漠》2013年第6期1789-1795,共7页Journal of Desert Research

基　　金：国家自然科学基金项目(31170402);国家重大基础研究发展计划项目(2009CB421308);中央高校基本科研业务费专项(DC120101141);国家级大学生创新创业训练计划项目(G2012006)资助

摘　　要：放牧强度影响草原植被的固碳能力。本文以呼伦贝尔克鲁伦河流域的半干旱典型草原作为研究区域,开展不同放牧压力下异质性植被-土壤系统中碳截存的特征研究。研究发现:不同放牧梯度下,土壤有机质、地上生物量、地下生物量和土壤微生物生物量碳彼此之间呈一定的相关性。随着放牧强度的加剧及土层深度的加深,土壤碳截存量呈减少趋势。其中,土壤有机质的变化趋势与土壤碳截存量趋势相同;而土壤无机碳含量呈现逐渐增大的特征。过度放牧破坏了土壤的理化性质及土壤质量,加速了土壤有机质的损失。草原群落的根冠比也随着放牧强度的增大而增加。以土壤微生物生物量碳作为土壤固碳能力的指标,不同放牧强度下的草原群落土壤固碳能力为轻牧区>中牧区>重牧区。Grazing intensity influences carbon sequestration ability of grassland community. A research on carbon solid deposit characteristics of heterogeneous vegetation and soil system in different grazing intensi ties was conducted in the Hulunbeir grassland, Inner Mongolia. The results show that under grazing gradi ents, there was certain correlation among soil organic carbon matter, the ground biomass, underground bio mass and soil microbial biomass carbon. With the increasing grazing stress and soil depth, carbon sequestra tion and soil organic matter reduced but soil inorganic carbon content gradually increased. In addition, the rootshoot ratio gradually increased. Affected by overgrazing, soil physical and chemical properties and soil quality became poor, thus these accelerated the loss of the soil organic matter. With the soil microbial bio mass carbon as index of soil carbon sequestration degree, carbon sequestration capacity decreased with in crease in grazing intensity.

关 键 词：放牧梯度 地上生物量 地下生物量 土壤有机质 微生物生物量碳 

分 类 号：S812.2[农业科学—草业科学]