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草地学报  2015 

短花针茅荒漠草原不同载畜率的土壤呼吸与植物地下生物量的关系

DOI: 10.11733/j.issn.1007-0435.2015.03.008, PP. 483-488

Keywords: 土壤呼吸,植物地下累积生物量,根系净生长量,载畜率

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Abstract:

本文运用开路式土壤碳通量测量系统-LI-8100在短花针茅(StipabrevifloraGriseb)荒漠草原测定4组不同载畜率的土壤呼吸速率动态,并用土钻法测定了植物地下累积生物量,埋根袋法测定了根系净生长量。目的是比较不同载畜率对土壤呼吸、植物地下累积生物量和根系净生长量的影响,并探讨生长季土壤呼吸、8月份土壤呼吸对植物地下累积生物量、根系净生长量的响应。结果表明随着载畜率增加,植物地下累积生物量减少,根系生长减缓,但对土壤呼吸无显著影响;生长季土壤呼吸与植物地下累积生物量呈线性正相关,8月份土壤呼吸值随根系净生长量增大而增大。土壤呼吸受植物地下生物量影响显著,生长季初期,新根刚开始生长,土壤呼吸大部分来自老根,到了生长旺季,新根生物量增多,土壤呼吸速率加快,新根主导了土壤呼吸。

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