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OALib Journal期刊
ISSN: 2333-9721
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气候变化对净生态系统生产力的影响
DOI: 10.11821/xb200403005, PP. 357-365
Keywords: 土壤异养呼吸,净初级生产量,净生态系统生产力,气候变化,中国
Abstract:
基于生态系统碳平衡方程以及净第一性生产力(NPP)和气候资料反演了1km分辨率的中国土壤异养呼吸系数(aij),结果表明aij总体上是东南和东北地区高,西北地区低；和NPP相比,东南沿海和华南的大部分地区的aij值并不大,而在东北北部和东部有大面积的aij高值区。这表明当气候适宜时,这些地区的土壤异养呼吸将具有较大的增长潜力。在假定气温平均升高1.5oC,降水平均增加5%的情景下,对中国净生态系统生产力(NEP)的研究表明生态系统与大气的碳通量都有所增加,其中NPP平均增加了6.2%,土壤异养呼吸平均增加了5.5％,不同生态系统的NEP存在很大的差异,其中最稳定最有潜力的自然生态系统的碳汇是北方落叶针叶林；对人工植被而言,最多最稳定的碳汇是一年一熟作物；而双季稻连作喜温作物和单(双)季稻连作喜凉作物生态系统起着较稳定的碳源作用。
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