黑龙江省百年自然植被氧气生产量比较研究

The Century Dynamics Comparison of Oxygen Production of The Natural Vegetation in Heilongjiang Province

随着对气候变化研究的深入,大气中氧气含量变化也应引起关注。以黑龙江省1900和2009年自然植被分布为基础,运用C-FIX模型及ArcGIS空间分析,依据碳氧平衡方法,比较1900年和2009年黑龙江省区域氧气生产量。结果表明:①黑龙江省百年来自然植被生产的氧气量呈减少趋势,减少37.8%。②百年来黑龙江省自然植被氧气生产量空间分布西南部及三江平原西部降低明显。③百年来黑龙江省各行政区及县域氧气生产量均为减少趋势,平均减少50%。减少最多的是哈尔滨市,以西部及西南部最显著。④人类活动导致自然植被面积减少是导致氧气生产量减少的主要因素。

With the development of climate change research, the oxygen concentration in the atmosphere has attracted more and more attentions. This study attempts to estimate and compare regional oxygen production using the ratio of the net ecosystem productivity and oxygen mass according to the principles of the plant photosynthesis and respiration. The total amount and spatial distribution of the century dynamics of the vegetation oxygen production in Heilongjiang Province are estimated by employing the C-FIX model and spatial analysis function in ArcGIS based on the vegetation spatial distribution of Heilongjiang Province, in 1900 and 2009. The results show that： 1） the total amount of the vegetation oxygen production of Heilongjiang Province in 1900 is 338.05 million tons. The total amount of the vegetation oxygen production in 2009 is 210.23 million tons. The vegetation oxygen production decreased about 37.8% with the vegetation deductions in the past one hundred years. 2） The spatial distribution trend of the oxygen production in Heilongjiang Province, 1900 and 2009 are pretty similar. However, they have significant spatial distribution variability. The western and southwestern part of Heilongjiang Province shifted from high oxygen production region in 1900 to low oxygen production region in 2009. The oxygen production in the eastern part, the Sanjiang Plain, has also decreased significantly. 3） The oxygen production trends to decrease at county level in Heilongjiang Province, and the average decrease rate are over 50%. In contrast, Yichun, Heihe and Tahe show increasing trend, but not significantly, and the average decrease rate is less than 5%. The most significantly decreased cities are Harbin, Shuangcheng, Suihua, Suibin, Lanxi, Baiquan, Hulan, and Yi＇ an, and the average decrease rate is over 90%. 4） The results of control experiments show that, the century vegetation deduction caused about 162.10 million tons decrease of the oxygen production. The oxygen production increased about 34.28 million tons due to the climate change. The amount of the oxygen production decreased by vegetation change is about 4.728 times of the oxygen pro- duction increment caused by climate change. In summary, the vegetation deduction is the main reason for the regional oxygen production decrement.