ZHANG Yu,WANG Tianwei,CAI Chongfa,et al.Characteristics of Arable Land Fragmentation and the Socioeconomic Drivers in the Arid Area[J].Research of Soil and Water Conservation,2016,23(04):179-184.
干旱区耕地景观格局碎化特征及社会经济驱动因素分析
- Title:
- Characteristics of Arable Land Fragmentation and the Socioeconomic Drivers in the Arid Area
- Keywords:
- arable land; landscape pattern index; socioeconomic factors; partial least squares (PLS) regression models
- 分类号:
- F301.21
- 摘要:
- 为探讨干旱区耕地碎化特征与驱动机制，基于特克斯县1990年、1998年、2000年、2003年、2006年、2011年的遥感影像，利用遥感与GIS技术，分析了研究区20 a来耕地景观格局变化特征。并运用偏最小二乘回归模型探讨了耕地景观格局指数变化的驱动因素。结果表明：1990—2011年，研究区斑块碎化程度在逐步增大，斑块密度呈现增加的趋势；平均最近邻体距离与面积加权平均分维数在2000年前后均呈现出先减小后增大的特点，且两者的变化率在1998—2000年和2006—2011年均为正值，在其他阶段则均为负值，而斑块密度变化率的趋势则与之相反。回归模型结果显示，影响耕地碎化的主要因素包括总人口、农业机械总动力、粮食作物产量、油料作物产量等，但在三个模型中，各影响因子作用力大小存在一定差异。人口的增长与城镇化水平的提高，使大量耕地改造为建设用地，从而导致了耕地的碎化。而农业机械化水平的提高促进了耕地的集约化，在一定程度上减小了耕地斑块的孤立程度。
- Abstract:
- In order to investigate the fragmentation and driving mechanism of arable land in the arid areas, the arable land patterns of Tekes County were analyzed based on the images in 1990, 1998, 2000, 2003, 2006 and 2011, using remote sensing and GIS. The driving forces of the change of arable land patterns were identified using the partial least squares regression models. The results showed that the arable land fragmentation was increasing during the study period with the increase of patch density (PD), and both the area-weighted mean patch fractal dimension (AWMPFD) and euclidian mean nearest neighbor distance (MNN) increased and then decreased before and after 2000. The change rates of MNN and AWMPFD were negative during the period from 1998 to 2000 and the period from 2006 to 2011, and positive during the other periods, while PD had the opposite change trend. The results of the regression models indicated that the main driving factors of arable land fragmentation included the total population, the total power of agricultural machinery, grain crop yields, oil-bearing crop yields, while the effects of the variables were different in the three models. Large amount of arable land was replaced by construction land due to the population growth and the rapid urbanization, resulting in the arable land fragmentation. The improvement of agricultural mechanization promoted the intensive use of arable land, which reduced the isolation of arable land patches to some extent.
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备注/Memo
收稿日期:2015-08-17;改回日期:2015-09-06。
基金项目:国家科技基础性工作专项（2014FY110200A16）；中央高校基本科研业务费专项资金资助项目（2662015JC007）
作者简介:张瑜(1988-),女,湖北钟祥人,博士研究生,研究方向为遥感与地理信息系统应用。E-mail:zhangy3172@163.com
通讯作者:王天巍(1977-),男,湖北荆州人,博士,副教授,研究方向为土地覆盖变化、土壤侵蚀机理、遥感与地理信息系统应用。E-mail:wangtianwei@webmail.hzau.edu.cn