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论文结合草地生物量调查资料、对应时段NDVI数据,分析了1982—2003年不同时期我国草地生物量空间格局变化特征及其与气候变化的关系。结果表明:20世纪80年代初期到末期,全国大部分地区草地生物量增加或基本持平;80年代末期到90年代初,大面积范围内草地生物量降低,热性草丛、温性草甸草原、山地草甸、低地草甸下降幅度分别为10.86%、4.96%、4.86%、3.49%;90年代末期后,北方大部分地区草地生物量上升到80年代的水平,南方草地生物量略有上升;1982—2003年草原区平均气温上升0.6~1.5℃,降雨量减少23.3%,草地生物量变化与降水量变化有弱相关关系(相关系数0.29),与气温变化无关。
Based on the data of grassland biomass survey and corresponding NDVI data of different time periods, this paper analyzes the characteristics of spatial variability of grassland biomass and their relationship with climate change in different periods from 1982 to 2003. The results showed that grassland biomass increased or remained basically the same in most parts of the country from the early 1980s to the end of the 1980s. In the late 1980s and early 1990s, the biomass of grassland decreased in a large area, while that in the hot grass, temperate meadow, In the mountainous meadow and lowland meadow, the decreasing rates were10.86%, 4.96%, 4.86% and3.49% respectively. After the late 1990s, the grassland biomass of most parts of northern China rose to the level of the 1980s, and the biomass of the southern grassland increased slightly. The average temperature in grassland increased by 0.6 ~ 1.5 ℃ from 1982 to 2003, and the rainfall decreased by 23.3%. There was a weak correlation between the change of grassland biomass and precipitation (correlation coefficient 0.29), which had nothing to do with the change of temperature.