摘要
依据宁夏中部干旱带同心县、盐池县等10个代表性气象台站36年(1975-2010年)逐旬气温、降水资料,基于Miami模型和Thornthwaite Memorial模型对宁夏中部干旱带1975-2006年间草地生产潜力作估算,并分析其变化规律,旨在为改良草地、植被恢复提供理论依据。结果表明:宁夏中部干旱带气候具有向"暖干化"变化的趋势,草地气候生产潜力年际变化范围为2668.56～7499.53kg.hm-2·a-1,气候生产潜力较大。当最高温度每升高或降低1℃,草地气候生产潜力增加或降低58.68kg.hm-2·a-1;年降水量每增加或降低1mm,草地气候生产潜力增加或降低18.64kg.hm-2·a-1。宁夏中部干旱带各区域年降水量与气候生产潜力相关系数为0.984～0.997,成极显著线性相关,而年均气温与气候生产潜力无显著相关性。在进行天然草地补种植物时,应考虑该地的自然承受力,即天然草地气候生产潜力。
The annual potential productivity of grassland in the middle arid zone of Ningxia during 1975 to 2006 was estimated according to the ten-day period temperature and precipitation of these years（1975-2010） recorded by 10 meteorological observatories using Miami model and Thornthwaite Memorial model.The objects were to analyze the change regulation of the potential climatic productivity and provide a theoretical basis for improving grassland and increasing vegetation.Results showed that the climate in the middle arid zone of Ningxia had a change tendency toward ＂warm dry＂.The inter-annual variation range of the grassland potential climatic productivity was 2668.56~7499.53 kg·hm-2·a-1 and the potentiality was large.The grassland potential climatic productivity increased or decreased 58.68 kg·hm-2·a-1 with the maximum temperature increasing or decreasing 1℃.The grassland potential climatic productivity increased or decreased 18.64 kg·hm-2·a-1 with the annual precipitation increasing or decreasing 1 mm.The annual precipitation and potential climatic productivity in the middle arid zone of Ningxia had an extremely significant linear correlation and the correlation coefficient was 0.984~0.997,whereas the average annual temperature and potential climatic productivity did not have a significant correlation.Therefore,the natural tolerance,namely potential climatic productivity of the natural grassland of the area,should be considered when planting.
出处
《草地学报》
CAS
CSCD
北大核心
2013年第2期236-242,共7页
Acta Agrestia Sinica
基金
全球环境基金项目(NX-GEF-200901)资助
