JOURNAL OF NATURAL RESOURCES ›› 2019, Vol. 34 ›› Issue (5): 921-933.doi: 10.31497/zrzyxb.20190502

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Evaluation of land resources carrying capacity of Tibetan counties based on dietary nutritional demand

Wei WANG1,2(), Hui-min YAN2,3(), Yan-zhao YANG2,3, Wen-peng DU2,3   

  1. 1. College of Earth Science and Resources, Chang'an University, Xi'an 710054, China
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-12-01 Revised:2019-03-31 Online:2019-05-28 Published:2019-05-28

Abstract:

"Food nutrition safety" is an important component of "food safety". At present, the evaluation index of "grain" as the carrying capacity of land resources can only reflect part of the carrying capacity, and the assessment from the perspective of dietary nutrition is more in line with the actual land resource carrying status. Based on the dynamic balance between supply and demand, this paper selects calorie and protein as key parameters to construct the land resource carrying capacity (LCC) calculation and land resource carrying index (LCCI) evaluation model, and the land resource carrying capacity of Tibet Autonomous Region at county level in 2015. Quantitative evaluation of the land resources carrying status provides a scientific basis for the realization of the balance of calorie and protein supply and demand in Tibet, and lays the foundation for the study of the changes, mechanisms and countermeasures of the nutritional needs of residents in the region. The results show that: (1) The land resource carrying capacity of Tibet is generally surplus. The land resources of the "Yarlung Zangbo River and its two tributaries" basin in the southeastern part of Tibet have high carrying capacity, while those in the counties of Naqu and Ali in the northwest of the study area have low carrying capacity. (2) According to the evaluation results of land carrying capacity based on the actual consumption of calorie and protein, in farming counties, semi-farming and semi-pastoral counties, and pastoral counties, the carrying capacity of protein indicators is 8.83%, 22.51% and 67.78% more than that of calorie indicators, respectively, and there are 13 pastoral counties and farming and pastoral areas with calorie overloaded and without protein overloaded. The reason is that the animal food calorie supply ratio is high in the pastoral counties and the farming and pastoral counties, and the food protein supply capacity is stronger than the calorie supply capacity. (3) According to the per capita calorie and protein intake standards recommended by residents' dietary pagodas, the carrying capacity of land resources based on calorie and protein demand in farming counties, semi-farming and semi-pastoral counties and pastoral counties is higher than the actual nutrient intake of residents, or carrying 35.22% and 12.5% more of the population, respectively. The assessment results reflect the differences in the carrying capacity and carrying status of each county under the actual consumption and dietary standard scenarios and between different nutritional indicators. It is possible for us to seek to improve the regional human food balance and the dietary nutrition level of residents by adjusting population structure and dietary structure.

Key words: Tibet, dietary nutrition demand, food supply, food consumption, land carrying capacity