两种生产力模型在内蒙古的应用分析

Application and Analysis on Two Kinds of Productivity Models in Inner Monglia

两种生产力模型在内蒙古地区应用结果表明:①近10 a内蒙古地区生产力下降明显,尤其在呼伦贝尔市西部、通辽市和赤峰市部分地区。②植物气候生产力与净第一性生产力模型在寒冷区和干旱区的主要影响因子是低温和干旱,主要限制因子地区差异明显。结合下垫面植被状况来看两种生产力模型在内蒙古东北部应用效果较差,西部区无明显差异。③同期30 a内蒙古温度呈显著增加趋势,降水下降趋势属正常气候波动。④近30 a植物气候生产力与净第一性生产力平均偏高1.58 t·hm^(-2)·a^(-1),前者年际波动较大,稳定性不如净第一性生产力。综合来看,两种生产力模型主要考虑了年平均温度和降水,对雨热同期的内蒙古东北地区评估性较差,如果生产力模型采用地区生长季气象条件代替年度平均,就能更好体现地区植被实际生产潜力,这也是当前生产力评估模型进一步改进的关键所在。

The paper studied application and analysis on the two kinds of productivity models in Inner Mongolia, and the results showed that productivity in Inner Mongolia decline significantly in past 10 years, especially in the west of Hulunbeier City, parts of Tongliao City and Chifeng City. The main influence factors of two kinds of models in cold area and arid areas were the low temperature and drought, respectively. Considering the condition of underlying surface vegetation, the two kinds of productivity models were applied in the northeast of Inner Mongolia and the results were not satisfactory, the western area was insignificant difference. Nearly 30-year correlation analysis showed that the temperature presented an increase trend significantly, and precipitation was a normal climate fluctuation. Climate productivity was higher than net primary productivity 1.58 t·hm^-2 ·a^-1 in past 30 years. The climate productivity annually fluctuated obviously,and Net Primary Productivity was relatively stable. Two main productivity models all took into account the annual average temperature and precipitation,but the models showed lower productivity estimation on the rain-heat cover the same period of Inner Mongolia northeast area.If the productivity model used regional growth season weather conditions instead of annual average value, it could be better reflecting the actual potential production of regional vegetation, which was also the key factor to further improve the current productivity evaluation model.