高寒草原对气候生产力模型的适用性分析

本研究利用中国科学院巴音布鲁克草原生态研究站1984-1990年、2004-2008年2个时间序列植物营养生长期的气候指标及净第一性生产力(NPP)实测值,结合北京模型、综合植被模型和林慧龙等建立的模型模拟研究区的NPP;根据3个模型NPP的模拟值与实测值对其进行了一元线性回归与相关分析,并基于NPP的模拟值探讨了研究区草地载畜量。结果表明,北京模型(R=0.857**)、综合植被模型(R=0.894**)和林慧龙建立的模型(R=0.894**)的NPP模拟值与实测值相关性及一元线性回归方程拟合较好,同时从线性回归的拟合度也揭示了降水是研究区NPP的主要限制因子,而温度对NPP的影响程度相对较小。在年均气温增加2和4℃,年降水量增加20%时,草地理论载畜量分别由目前的0.94个羊单位/hm2增加到1.49和1.62个羊单位/hm2。

Analysis of adaptation of a climate productivity model on alpine grassland

The Bayanbulak ecological station has records of the representative plant vegetative stages between 1984-1990 and 2004-2008 periods. Based on the climate index and net primary productivity (NPP) of the station this paper analyzes the NPP by the Beijing Model, the integrated vegetation model, and the Linghuilong building model. The modeling and measured values were fitted by linear regression and the carrying capacity of Bayanbulak grassland was estimated. 1) the modeling values calculated from the Beijing model(R=0.857~(**)), integrated vegetation model (R=0.894~(**)), and Linghuilong building model(R=0.894~(**)) all fit well with the observational values; 2) precipitation rather than temperature is the determinant factor influencing the NPP of Bayanbulak grassland; 3) as the annual temperature increases 2 and 4℃ and precipitation increases 20%, the carrying capacity will increase from 0.94 sheep units per hectare (Beijing model) to 1.94 sheep units per hectare (integrated vegetation model) and 1.62 sheep units per hectare (Linghuilong building model).