陇东耕地净第一性生产力与生态服务价值分析

Analysis of Net Primary Productivity and Ecological Service Value in Cultivated Lands of Longdong Region,Gansu,China

通过定量分析耕地净第一性生产力与生态服务功能价值,为陇东生态脆弱区耕地生态系统的健康发展提供科学决策依据。利用农田县域统计资料,运用生态系统服务功能评估的相关理论、方法和GIS等工具对陇东地区耕地净第一性生产力和生态服务价值进行评价。结果表明,耕地净第一性生产力在平均值5.04t.hm-2.a-1上下波动;单位面积的生态服务价值在平均值9.25万元.hm-2.a-1上下波动。陇东耕地生产力低下,生态服务功能不高。耕地净第一性生产力是生态服务价值的决定因素,因此,通过提高耕地净第一性生产力来提高生态服务功能价值,对区域耕地的健康发展有重要作用。

Quantitative assessment and analysis of net primary productivity（NPP） and ecological service value（ESV） is helpful for healthy development of the ecologically vulnerable cultivated lands in Longdong,Gansu.NPP and ESV in Longdong region were assessed by using theories and methods related to ecological system service assessment and GIS.Results showed that the average value of NPP was about 5.04 t·hm-2·a-1 in study region,and the ESV per unit area was about 9.25×104 yuan·hm-2·a-1,so the NPP and ESV were low in Longdong region.NPP is a key factor determining ecological service value in farming system,so NPP must be improved to increase the ESV,which will play an important role in keeping the healthy development of cultivated land.