摘要
【目的】科学、准确地量化农田生态系统的涵养水源服务,有助于其更好地发挥调节水源、稳定水源供应的作用,以缓解水源短缺的危机.【方法】在3S技术支持下,采用土壤蓄水法估算了关中-天水经济区农田生态系统水源涵养量,并采用影子工程法、成本估算法等计算了其涵养水源的价值量.【结果和结论】关中-天水经济区农田生态系统涵养水源量及其价值在1980—2010年的30年间呈先减少后增加的总体变化趋势,其中,1980—2005年农田生态系统涵养水源总量从32.219亿m3·年-1减少至19.691亿m3·年-1,涵养水源总价值从21.587亿元·年-1减少至13.193亿元·年-1,年均减少1.56%;2005—2010年生态系统总涵养水源数量从19.691亿m3·年-1增加到31.638亿m3·年-1,总涵养水源价值从13.193亿元·年-1增加到32.219亿元·年-1,年均增长为7.42%.由于退耕还林还草政策的正向引导,在耕地面积日益减少的情况下,农田生态系统的涵养水源量及涵养水源价值量依然呈增长趋势,并具有一定的时空变化:在时间上表现为先减少后增加;在空间上表现为东南平原高,西北山地、丘陵低的变化趋势.
[Objective]It is important to quantify the water conservation services of the farmland ecosystem scientifically and accurately , which is helpful to play roles of regulating water and stabling the water sup-ply, alleviating the water scarcity crisis .[Method]Under 3S, the quantity of water conservation in the farmland ecosystem in Guanzhong-Tianshui economic zone was estimated by the method of soil water stor-age , and the value with Shadow Engineering and Cost Accounting Methods .[Result and conclusion]Dur-ing the 30 years from 1980 to 2010 , the change tendency of the quantity and value of water conservation in the farmland ecosystem in Guanzhong-Tianshui economic zone had been decreasing at the beginning and then increaseing .From 1980 to 2005, the water conservation quantity decreased from 3.221 9 ×10^9 m3 · year -1 to 1.969 1 ×10^9 m3 · year -1 , and water conservation values decreased from 2.158 7 ×10^9 yuan· year -1 to 1.319 3×10^9 yuan· year -1 , with an average annual decrement of 1.56%;while from 2005 to 2010, the water conservation quantity increased from 1.969 1 ×10^9 t· year -1 to 3.163 8 ×10^9 t· year -1 , and water conservation values increased from 1.319 3 ×10^9 yuan· year -1 to 3.221 9 ×10^9＆amp;nbsp;yuan· year -1 , with an average annual increment of 7.42%.Under the positive guidance of returning farmland to forest/grass land policy , even if the farmland area was reducing gradually , there was an in-creasing trend of the quantity and value of water conservation in the farmland ecosystem in Guanzhong -Tian-shui economic zone .And there was a certain temporal and spatial variation：It decreased at the beginning and then increased in the time;while in the space , it was high in in the southeast plains and low in the northwest mountainous areas .
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2014年第3期52-57,共6页
Journal of South China Agricultural University
基金
国家自然科学基金(41001388
41371020)
陕西省自然科学基础研究计划(2012JM5011)
关键词
关中-天水经济区
农田生态系统
涵养水源量
涵养水源价值
时空变化
Guanzhong-Tianshui economic zone
farmland ecosystem
water conservation quantity
water conservation value
temporal and spatial variation
