摘要
全球气候变暖势必给全球的环境带来各方面的影响,在生态系统的功能,特别是初级生产力和碳储量,对全球气候变化的响应决定着陆地生态系统作为净的碳汇(Sink)或碳源(Source)而对全球碳循环变化起着减缓或加速作用。本研究在控制实验条件下,对内蒙古短花针茅荒漠草原在人为增温和增温+施氮处理下生态系统气体交换变化规律及其主要影响因素进行了研究,旨在揭示了短花针茅荒漠草原在增温条件下生态系统气体交换的基本特征,为阐明全球气候变化条件下短花针茅荒漠草原生态系统气体交换与碳循环及碳管理提供基础数据。
研究结果表明:
1、增温影响了短花针茅荒漠草原土壤水分运动形式、速度和降水入渗量,从而加速了整个生态系统水分的循环速度。
2、不论在自然和增温条件下,短花针茅荒漠草原生态系统在整个植物生长季里都表现为对碳的吸收,成为碳汇。
3、施氮肥对短花针茅荒漠草原生态系统气体交换影响不显著;增温和施氮互作效应对短花针茅荒漠草原碳的循环影响显著。
Global warming and changing precipitation regime could have a profound impact on all aspects of golbal environment. In ecosystem functions, especially primary production and carbon reserves response to the global climate change, it is decision to land ecosystem as a net carbon sink or carbon source and changes in the global carbon cycle plays a role in speeding up or slowing. .Given changes in the Earth’s surface temperature and precipitation regime could profoundly impact terrestrial carbon cycling and sequestration, with consequent feedbacks to global climatic change. This study in the control of experimental conditions in the Stipa Breviflora Griseb. desert steppe in Inner Mongolia. ,With warming and warming + N , study of ecosystem gas exchange and its main factors and the basic characteristics factors, as set out under the conditions of global climate change Stipa breviflora desert grassland ecosystem gas exchange and carbon cycle and carbon management to provide the basic data.
The results showed:
1. Warming affected the soil water movement、speed and volume of rainfall infiltration of the Stipa Breviflora Griseb. desert steppe, thus speeding up the whole ecosystem of the water cycle speed.
2、Whatever no warming or under warming, in the entire performance of the Stipa Breviflora Griseb. desert steppe ecosystem, in the growing season plants absorb carbon, which means it’s carbon sinks.
3、Nitrogen application on the Stipa Breviflora Griseb. desert dteppe ecosystem gas exchange did not has significant effect;Warming and nitrogen interaction effects of the Stipa Breviflora Griseb. desert steppe carbon cycles significantly.
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