FENG Jianmin,GUO Lingxia,LI Xiaohua.Temporal and Spatial Variations of Land Uses and Their Influences on Ecosystem Service Function Values in Hanzhong City[J].Research of Soil and Water Conservation,2020,27(01):275-282.
汉中市土地利用时空变化及其对生态系统服务价值的影响
- Title:
- Temporal and Spatial Variations of Land Uses and Their Influences on Ecosystem Service Function Values in Hanzhong City
- 文章编号:
- 1005-3409(2020)01-0275-08
- Keywords:
- land use change; ecosystem service value; Hanzhong City
- 分类号:
- F301.24; X24
- 文献标志码:
- A
- 摘要:
- 汉中市地处气候南北分界线的秦岭—巴山两大山系之间,是国家级重点生态功能区,同时也是“南水北调”中线引水工程的主要水源保护地。对汉中市土地利用变化及其生态服务功能价值影响的研究可为水源保护以及环境质量的改善提供重要理论依据和决策支持。利用遥感和GIS技术分析了汉中市1990—2015年的土地利用变化特征及其对区域生态服务价值的影响。结果表明:1990—2015年汉中市林地和建设用地面积呈增加,而草地、耕地、水域和未利用地则呈减少的趋势。2010年以来土地利用变化速率明显加快,地类之间的转化更为频繁,人类活动对土地利用的影响明显加强。土地转移主要发生在略阳县、勉县、宁强县、西乡县和镇巴县。1990—2015年汉中市土地利用的年总生态服务价值持续增加,特别是林地的生态服务价值增加幅度较大。林地面积增加使得1990—2015年汉中市的原材料生产、气候调节、气体调节、生物多样性保护土壤形成与保护和提供娱乐文化生态功能占年总价值的比值增加。林地、耕地和水域是汉中市生态服务的主要贡献者,也是生态服务价值变化的敏感因子。
- Abstract:
- Hanzhong City is located between the Qinling and Bashan Mountains where the climate presents the north-south transition feature, and is an important national key ecological function zone and water conservation site for south-to-north water diversion central line project. A study of land use changes and their influences on ecosystem service-function values of the study area can provide important theories for effective decision-making regarding water resource protection and environmental quality improvement. GIS and RS technology were used to analyze land-use changes that occurred within the Hanzhong City from 1990 to 2015, and ecosystem service-function values of the lands were estimated. The results showed that forest and building lands increased, whereas grasslands, farmlands, water areas and unused areas decreased during the study period. Based on dynamic degree of land use, land use change rates have accelerated significantly since 2010. Furthermore, land use types converted more frequently, and land-use changes were more greatly affected by human activities in 2010—2015 than in 1990—2010. Land conversion mainly occurred in Lueyang, Mian, Ningqiang, Xixiang, and Zhenba Counties. The annual value of total ecosystem service functions of the lands continued to increase during the period 1990—2015. Service function values of grasslands, water areas, farmlands and unused areas decreased, whereas that of forestland significantly increased during the period 1990—2015. Due to increase of forestland, percentages of values of raw material production, air conditioning, climate regulation, biodiversity conservation, soil formation and protection and entertainment culture increased during the study period. Forestlands, grasslands, and farmlands were not only the main contributors but also sensitive factors to ecosystem service function values of the lands within Hanzhong City from 1990 to 2015.
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备注/Memo
收稿日期:2019-01-21 修回日期:2019-03-12
资助项目:国家自然科学基金(41661042,41261040);陕西省普通高等学校优势学科专项资金建设项目(0602)
第一作者:封建民(1972—),男,陕西省凤翔县人,博士,教授,主要从事环境遥感与土地利用研究。E-mail:feng_jianmin@aliyun.com