陕北地区土地利用变化对生态服务功能价值的影响

发布时间：2019-08-06 21:16

【摘要】：以陕北地区榆林、延安2市作为研究区域,利用土地利用变化数据,对陕北地区用地类型的变化进行分析,并使用合适的生物量因子,修正生态服务功能价值当量表,使当量表更符合陕北地区的实际情况,结合已有研究得到的二级用地类型当量因子比例关系,细化生态系统服务功能当量因子表,以便更准确的估算陕北地区生态系统服务功能价值。结果表明:1985—2013年间,主要用地类型变化为耕地、林地和草地,耕地面积减少2 811 km2,减少率达到9.98%,林地和草地面积分别增加1 392和2 417 km2,增幅分别达到12.85%和7.10%;其中,2000—2013年面积急剧变化,林地和草地面积的增加量分别是1985—2000年的7倍和2倍,退耕还林(草)效果明显;生态系统服务功能价值大量增加,林地和草地的生态系统服务功能价值增量分别为25.2亿和13.9亿元,2000—2013年的增量是1985—2000年增量的3倍。生态服务功能价值的变化与全面推行退耕还林(草)的时间相对应,表明退耕还林(草)政策,对陕北地区生态系统服务功能价值有积极的影响。
[Abstract]:Taking Yulin and Yan'an cities in northern Shaanxi as research areas, this paper analyzes the change of land use types in northern Shaanxi by using land use change data, and modifies the scale of ecological service functional value by using appropriate biomass factors to make the scale more in line with the actual situation in northern Shaanxi, and refines the table of functional equivalent factors of ecosystem services in combination with the proportion relationship of equivalent factors of secondary land types obtained in the previous studies. In order to estimate the value of ecosystem service function more accurately in northern Shaanxi. The results showed that during 1985 / 2013, the main land use types were cultivated land, forest land and grassland. The decrease rate of cultivated land area by 2811 km2, was 9.98%, and the area of forest land and grassland increased by 1.392 and 2.417 km2, respectively, by 12.85% and 7.10%, respectively. Among them, the area of forest land and grassland changed sharply from 2000 to 2013, and the increase of forest land and grassland area was 7 times and 2 times of that of 1985-2000, respectively, and the effect of returning farmland to forest (grass) was obvious, and the value of ecosystem service function of forest land and grassland was 2.52 billion yuan and 1.39 billion yuan, respectively, and the increment of forest land and grassland was 3 times of that of 1985-2000. The change of the functional value of ecological service corresponds to the time of carrying out the conversion of cropland to forest (grass) in an all-round way, which indicates that the policy of returning cropland to forest (grass) has a positive impact on the functional value of ecosystem service in northern Shaanxi.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室培育基地;黄土高原土壤侵蚀与旱地农业国家重点实验室;黄河水利科学研究院;
【基金】：国家重点研发计划“黄河流域水沙变化趋势集合评估”(2016YFC0402407);国家重点研发计划“沟道工程对流域水沙变化影响及其贡献率”(2016YFC0402404) 国家自然科学基金青年项目“基于藤Copula的黄河宁蒙河段冰凌概率预报模型研究”(51509203) 中央级公益性科研院所基本科研业务费专项资金项目“基于WHAT-IF模型的黄河流域典型灌区节水改造实施效果评估”(HKY-JBYW-2017-23) 水利部公益性行业科研专项经费“生产建设项目水土保持生态效应监测与评价技术研究”(201501045)
【分类号】：F301.2;X171

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