文摘
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选取自2002年围封禁牧和持续冬季适度放牧两种处理下的高寒矮嵩草(Kobresia humilis)草地为研究对象,分别对其土壤呼吸速率、根系生物量、土壤含水量、土壤容重、土壤有机碳和全氮含量进行了比较分析。结果表明,持续冬季放牧条件下的土壤呼吸速率、根系生物量和土壤容重均高于围封禁牧的高寒草地,而土壤含水量、有机碳和全氮含量均显著低于围封草地。适度的放牧活动有利于地下生物量的积累,促进生物量向地下的转移,可以加速氮的矿化和土壤有机碳的分解,增加土壤的活性;适当的围封措施则可以保持土壤养分,避免土壤有机质流失。 |
其他语种文摘
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Soil properties under two conditions(fenced without grazing since 2002 and continuously grazed in the winter) were compared in the alpine meadow on Qinghai-Tibet Plateau.Under the two conditions,soil respiration rate,root biomass,soil water content,bulk densities,soil organic carbon and total nitrogen contents were compared and analyzed.The results showed that the soil respiration rate,bulk density and root biomass at the winter-grazed meadow were higher than those at the fenced meadow;while the soil water content,organic carbon and total nitrogen contents at the winter-grazed meadow were lower than those at the fenced meadow.Moderate grazing in the alpine meadow could increase the activities of soil microbes and accelerate mineralization and decomposition of soil nitrogen and organic carbon.However,appropriate exclusion of grazing can maintain soil nutrients and avoid loss of soil organic matter. |
来源
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草业科学
,2012,29(3):341-345 【扩展库】
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关键词
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围封
;
放牧
;
土壤呼吸速率
;
土壤有机碳
;
高寒草地
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地址
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1.
中国科学院西北高原生物研究所, 中国科学院高原生物适应与进化重点实验室, 青海, 西宁, 810008
2.
中国科学院西北高原生物研究所, 青海, 西宁, 810008
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1001-0629 |
学科
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农业基础科学;畜牧、动物医学、狩猎、蚕、蜂 |
基金
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中国科学院战略性先导科技专项
;
中国科学院知识创新工程项目
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文献收藏号
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CSCD:4497185
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