渭河源区坡耕地时空变化及其土壤保持效应
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S157.1

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甘肃省自然科学基金项目“渭河源区生态系统服务权衡与协同关系研究”(20JR10RA443);甘肃省软科学专项(20CX9ZA026);甘肃省生态环境厅重点项目(2020zfcg02072)


Spatiotemporal Changes of Sloping Farmland and Their Soil Conservation Effect at Source Area of Weihe River
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    [目的] 分析渭河源区不同等级坡耕地的时空变化,揭示不同坡耕地类型的土壤保持效应,探讨退耕还林还草工程对渭河源区坡耕地及土壤保持的影响,为完善不同坡耕地资源合理规划利用提供科学依据。[方法] 利用1990,2000,2010和2020年4期渭河源区土地利用和地形数据,通过叠加分析、耕地动态度、土地利用转移矩阵和中国土壤流失方程等方法进行分析。[结果] ①1990—2020年耕地呈先缓慢增加后急剧减少再缓慢减少的趋势,面积净减少321.03 km2,其中陡坡耕地和缓坡耕地是耕地变化主要类型。②近30 a来,耕地的时空变化主要表现为1990—2000年耕地少量转入,主要分布在漳县和岷县;随着退耕还林还草工程的实施,有279.80 km2的坡耕地转变为林草地,其中耕地转换为草地主要分布在通渭和陇西县,而耕地转换为林地主要分布在陇西和岷县。③1990—2000年渭河源区林草地开垦导致土壤保持量减少5.52×104 t,而2000—2020年退耕还林还草导致土壤保持量增加2.21×106 t,其中大于15°的坡耕地的转变对土壤保持量变化影响更大。[结论] 渭河源区退耕还林还草工程成效显著,其中2000—2010年陡坡耕地的退耕面积最大,陡坡耕地退耕地土壤保持总体效应最大,但峭坡耕地退耕地单位效应最大。峭坡耕地仍有较大退耕空间,依旧是新一轮退耕任务的主要目标。

    Abstract:

    [Objective] The spatiotemporal changes of different grades of sloping farmland, the soil conservation effects of different sloping farmland types, and the impact of returning farmland to forest or grassland on sloping farmland and soil conservation at the source area of Weihe River were studied in order to provide a scientific basis for the rational planning and utilization of different sloping farmland resources. [Methods] Land use and topographic data at the source area of Weihe River from 1990 to 2020 were analyzed by superposition analysis, farmland dynamic attitude, land use transfer matrix, and the Chinese soil loss equation. [Results] ① During 1990 to 2020, the area of cultivated land increased slowly, then decreased sharply, and then decreased slowly, with a net decrease of 321.03 km2. Steep slope cultivated land and gentle slope cultivated land were the main types of cultivated land change. ② The temporal and spatial changes of cultivated land were mainly characterized by a small increase in cultivated land from 1990 to 2000, mainly located in Zhangxian County and Minxian County. With the implementation of the grain for green project (GGP), 279.80 km2 of sloping land were transformed into forest and grassland, in which the conversion of cultivated land to grassland was mainly located in Tongwei and Longxi counties, while the conversion of cultivated land to forest land was mainly located in Longxi and Minxian counties. ③ The reclamation of forest and grassland at the source area of Weihe River from 1990 to 2000 reduced soil conservation by 5.52×104 t, while returning farmland to forest and grassland increased soil conservation by 2.21×106 t from 2000 to 2020. The transformation of sloping land with greater than 15° slope could affect changes in soil conservation. [Conclusion] The implementation of GGP has achieved remarkable results at the source area of Weihe River. The area of farmland conversion on steep slopes was the largest from 2000 to 2010. The soil conservation effect on steep slopes was the largest on abandoned land. Steeply sloping farmland will be the main target during the new round of returning farmland.

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孙旭伟,姜泳波,王乃亮,王亚晖,赵鸿雁.渭河源区坡耕地时空变化及其土壤保持效应[J].水土保持通报,2023,43(4):405-412

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  • 收稿日期:2022-08-22
  • 最后修改日期:2022-11-19
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  • 在线发布日期: 2023-09-27
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