放牧强度对小针茅草原枯落物分解的影响

发布时间：2018-03-15 22:17

本文选题：小针茅草原　切入点：枯落物　出处：《干旱区资源与环境》2017年07期 　论文类型：期刊论文

【摘要】：文中依托内蒙古苏尼特右旗中国农业科学院荒漠草原试验示范基地的放牧控制试验平台,研究了不同放牧强度下小针茅草原枯落物的残留率、分解速率和质量损失率的动态变化,并探讨了分解速率与水热因子的关系。研究结果表明:1)经过一个生长季的分解,放牧不同程度地加速了枯落物的分解。中度放牧小区群落枯落物的分解速率最高,为1.225×10~(-3)g·d~(-1),比对照区高35.28%。2)随着分解时间的延长,不同放牧强度下小针茅群落枯落物的质量累积损失率呈增加的趋势。3)枯落物分解的质量损失量在不同的季节其增加的快慢有差异,在分解的5~7月,枯落物月质量损失量迅速增加,8月份以后枯落物月质量损失量开始降低。不同放牧强度下枯落物质量损失量大小依次为:MGEGHGLGCK。说明适度放牧有利于枯落物的分解。4)7月份枯落物的分解速率最快,其次为8月份,7、8月份水热条件较好,有利于土壤微生物的生长和繁殖,对枯落物的分解具有促进作用。
[Abstract]:Based on the grazing control test platform of the desert steppe test base of the Chinese Academy of Agricultural Sciences in Sunita Youqi of Inner Mongolia, this paper studied the residual rate of the litter in the grass under different grazing intensities. The dynamic changes of decomposition rate and mass loss rate are discussed, and the relationship between decomposition rate and hydrothermal factor is discussed. The decomposition rate of litter in moderate grazing plot was the highest, which was 1.225 脳 10 ~ (-3) g 路d ~ (-1) ~ (-1), which was 35.28.2% higher than that in control area) with the prolongation of decomposition time. Under different grazing intensity, the mass loss rate of litter in Stipa pueracea community showed an increasing trend. 3) the rate of mass loss of litter decomposition was different in different seasons, from 5 to July. The monthly weight loss of litter began to decrease after August. Under different grazing intensity, the weight loss of litter began to decrease in order of 10% MGEGHGLGCK. It shows that moderate grazing is favorable to decomposition of litter.) July. The decomposition rate of litter is the fastest. Secondly, the water and heat conditions were better in August and August, which was favorable to the growth and reproduction of soil microbes and promoted the decomposition of litter.
【作者单位】：内蒙古农业大学生态环境学院;中国农业科学院草原研究所;
【基金】：国家重点基础研究发展计划(973计划)项目(2014CB138805) 内蒙古自然科学基金(2014BS0331) 国家科技支撑计划课题(2012BAD13B07)资助
【分类号】：S812

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