内蒙古天然草地生产潜力及其限制性研究

研究构建了"光、温、水、土与草地利用"草地生产潜力5级订正模型,利用ArcGIS软件,以1 km×1 km栅格为单元,根据1980—2001年间气象观测资料,定量计算了对内蒙古6种天然草原的光合、光温、气候、土地和自然生产潜力,揭示了各级生产潜力的空间分布格局,并找出了天然草地生产力形成的主要限制因子。结果表明:从光合、光温、气候、土地到自然生产潜力,各种草地类型的生产潜力逐级降低;内蒙古草原生产潜力的分布范围在454~12323 kg/hm²;空间分布趋势是由东南向西北递减;不同地域、不同草地类型生产潜力的主导限制因子不同。

A Study of Rangeland Productive Potential and Limiting Factors in Inner Mongolia Autonomous Region

The rangeland productive potential research is advantageous to the reasonable use of rangeland resources.It gives full play to the rangeland productive potential and maximizes the output of grassland.There are some research models about it,such as climate productivity model,process model,and light energy use efficiency model.Against the six types of rangeland in Inner Mongolia Autonomous Region,established models were revised gradually according to solar radiation,air temperature,air humidity,soil fertility,and utilization status of rangeland resources,based on the meteorological data during 1980-2001 years,and the potential productivity range of rangeland resources in Inner Mongolia Autonomous Region was calculated using ArcGIS software at 1km x 1km grid level per ten days.The spatial distribution pattern of productive potential at each level was revealed.The main limiting factors of rangeland productive potential were found.The results show that the potential productivity of various rangeland types gradually decreased and the range of rangeland productive potential in the Inner Mongolia Autonomous Region was from 454 kg·hm^-2 to 12323 kg·hm^-2.The spatial distribution trend declined from the southeast to northwest of the Inner Mongolia Autonomous Region.The limiting factors of productive potential were different from different regions and different types of rangeland.