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凋落物去除和添加处理对典型草原生态系统碳通量的影响
Authors
张素彦
张艳杰
+4 more
王扬
白永飞
蒋红志
鲁顺保
Publication date
1 January 2018
Publisher
Abstract
为揭示凋落物去除和添加处理对草原生态系统碳通量的影响,2013和2014年连续两年在成熟群落围封样地进行凋落物去除实验、在退化群落放牧样地进行凋落物添加实验,并运用静态箱法探讨碳通量变化规律并分析其主要影响因子。结果表明:两种群落的净生态系统CO_2交换(NEE)有明显的季节性变化。对成熟群落而言,去除50%凋落物显著增加了NEE,去除100%凋落物显著降低了NEE,而对生态系统总初级生产力(GEP)和生态系统呼吸(ER)均无显著影响;对退化群落而言,凋落物添加显著增加了GEP和NEE,而对ER无显著影响。两种群落的GEP与10 cm土壤温度显著正相关,但NEE和GEP的变化规律与土壤温度相反,与10 cm土壤湿度相同。由此可见,凋落物去除和添加处理对生态系统碳通量的影响主要是改变土壤湿度和地上生物量,而不是改变土壤温度。该研究为合理利用凋落物改善草地生态系统管理和促进草地恢复提供了理论依据
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of Botany,Chinese Academy Of Sciences
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Last time updated on 09/06/2022