围封和放牧对科尔沁沙质草地净生态系统碳交换量的影响

doi:10.7522/j.issn.1000-694X.2014.00183

摘要/Abstract

摘要： 利用箱式法对科尔沁地区围封和放牧条件下的沙质草地净生态系统碳交换量(NEE)进行研究,以探讨围封、放牧对NEE的影响。结果显示:(1)围封17年样地的NEE显著小于围封22年样地的,围封22年样地的显著小于放牧样地的(P<0.01)。(2)在植物生长季内,围封样地总体表现出碳汇功能,放牧样地表现出碳源功能。(3)从碳净固定的量来看,围封17年沙质草地的净碳固定能力强于围封22年的;而围封22年比围封17年的沙质草地的在净碳固定方面持续的时间较长。(4)不同环境因子对不同处理NEE的影响程度不尽相同,其线性组合最大可解释NEE的变异依次为围封22年(39.5%)>围封17年(32.1%)>放牧(21.2%)。

关键词: 沙质草地, 净生态系统碳交换量, 箱式法, 围封, 放牧

Abstract: Carbon exchange capacity in soil-vegetation-atmosphere system and its response to land use change is one of the key issues concerning global climate change research. Net Ecosystem Exchange (NEE) is a key feature of the ecosystem carbon exchange. In this study, the carbon flux under enclosed and grazing sandy grassland was studied by chamber-based gas measurement system to reveal the influence of land use change on NEE; thereafter we analyzed the relationships between NEE and environmental factors in Horqin sandy grassland. The results showed that: (1) NEE in 17-year enclosed grassland was significantly lower than that in 22-year enclosed; and NEE in 22-year enclosed grassland was relatively lower (P<0.01) than that in grazing grassland. This implied that carbon sequestration capacity would be boosted with enclosure of sandy grassland. (2) During the growing season, enclosed grasslands showed as carbon sinks, while grazing grassland indicated as a carbon source. (3) Providing only considering the carbon sequestration in sandy grassland, long-term enclosure should not recommended since carbon sequestration capacity in 17-year enclosed grassland was higher than that in 22-year enclosed grassland, although carbon sequestration in 22-year enclosed grassland lasted relatively longer during growing season. (4) The relationships between environmental factors and NEE in different grasslands were not straightforward, linear combination of environmental factors were able to respectively explain the variations of NEE by 39.5% in 22-year enclosed grassland, 32.1% in 17-year enclosed grassland, and 21.2% in grazing grassland. This exerted important significance for the effective management and scientific utilization of sandy grassland resources in the context of climate change.

Key words: sandy grassland, net ecosystem exchange, chamber method, enclosure, grazing

中图分类号:

Q948.15

孙殿超, 李玉霖, 赵学勇, 罗亚勇, 毕京东. 围封和放牧对科尔沁沙质草地净生态系统碳交换量的影响[J]. 中国沙漠, 2016, 36(1): 93-102.

Sun Dianchao, Li Yulin, Zhao Xueyong, Luo Yayong, Bi jingdong. Effects of Grazing and Enclosure on net Ecosystem Carbon Exchange in the Horqin Sandy Grassland[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 93-102.

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