College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China.
Regional and Urban-Rural Planning Research Center, Fuzhou University, Fuzhou 350116, China.
Ying Yong Sheng Tai Xue Bao. 2023 Jan;34(1):169-177. doi: 10.13287/j.1001-9332.202301.021.
Habitat quality assessment provides an effective interface for exploring the mechanisms linking land use change and biodiversity. We used InVEST model to assess the spatial and temporal variations of habitat quality in the Pearl River source area from 2000 to 2020, and to examine the impacts of land use change on habitat quality. The results showed that during the study period, construction land had the largest change, with an area increase of 321.48 km, and the area of grassland decreased most significantly. Habitat quality in the Pearl River source area was generally at a high level, with a small downward trend. The low value areas were concentrated in the town centers and main agricultural production areas, while habitat quality was high in the mountainous areas in the south and north region. The cold spots of habitat quality change had the most significant aggregation effect in the Quzhan Basin along the Nanpan River. The number of hot spots was small and scattered. Among the various types of nature reserves, habitat quality of Jiache Nature Reserve in Huize County was the lowest, and that of Zhujiangyuan Nature Reserve had a slight decreasing trend, mainly due to the transformation of grassland to cropland. The contribution of habitat quality degradation driven by land function change was 5.6 times as that of improvement. The encroachment of urban and rural construction space into grassland ecological space and agricultural production space was the dominant factor driving the reduction of habitat quality in the Pearl River source area. The contribution of construction land expansion decreased from 69.9% (2000-2010) to 46.7% (2010-2020). The expansion of construction land was the main cause for the degradation of habitat quality. The degradation threat from arable land expansion overtook the traffic network construction as the secondary threat source from 2010 to 2020. It was necessary to increase control of nature reserves in the Pearl River source area and to implement land use regulation strictly to guarantee no net loss and integrity of the ecosystem.
生境质量评估为探索土地利用变化与生物多样性之间的联系机制提供了有效的接口。本研究利用 InVEST 模型评估了 2000-2020 年期间珠江源区生境质量的时空变化，并探讨了土地利用变化对生境质量的影响。结果表明，在研究期间，建设用地变化最大，面积增加了 321.48km2，而草地面积减少最为显著。珠江源区生境质量总体处于较高水平，呈小幅度下降趋势。低值区集中在城镇中心和主要农业生产区，而南部和北部山区生境质量较高。生境质量变化的冷点在南盘江干流沿岸的曲江盆地具有最显著的聚集效应。热点数量较少且分散。在各种类型的自然保护区中，会泽县驾车自然保护区的生境质量最低，珠江源自然保护区呈略微下降趋势，主要是由于草地向耕地的转化。土地功能变化导致的生境质量退化的贡献是改善的 5.6 倍。城乡建设空间侵占草地生态空间和农业生产空间是导致珠江源区生境质量下降的主导因素。建设用地扩张的贡献从 2000-2010 年的 69.9%下降到 2010-2020 年的 46.7%。建设用地扩张是生境质量退化的主要原因。从 2010 年到 2020 年，耕地扩张对生境质量的退化威胁超过了交通网络建设，成为第二大威胁源。有必要加强对珠江源区自然保护区的管控，严格实施土地利用调控，确保生态系统不出现净损失和完整性遭到破坏。
