基于样地法的喀斯特山区县域耕地质量等别变化监测评价——以重庆市秀山县为例

Monitoring and Evaluation on Level Changes of Cultivated Land Quality in Karst Mountain Counties Based on Sample Plot Method——A Case Study at Xiushan County of Chongqing City

[目的]对喀斯特山区县——重庆市秀山县耕地质量等别变化进行监测评价,为该区耕地保护工作提供科学依据。[方法]采用样地法开展监测评价。[结果]首先通过对秀山县自然条件及社会经济现状进行分析,对该县耕地质量监测因素区域划分及叠加分析后,构建了10等旱地沉陷等40个秀山县2014年度耕地等别渐变类型区。在此基础上,利用样地法获取各等别渐变类型区监测指标。根据获得的监测因素值,按照"农用地质量分等规程"计算得到2014年耕地利用等指数。[结论]通过测算,秀山县2014年度各等别渐变类型区耕地平均等别表现稳定。耕地质量不同等别之间变化较小、各等别渐变类型区平均等别表现稳定和各等别之间面积增减较小3个方面。

[Objective] The monitoring and evaluation of the changes for cultivated land quality at Xiushan karst mountain county was carried out to provide a scientific basis for the protection of cultivated land. [Methods] Monitoring and evaluation were carried out by plot sampling method. [Results] Through the analyses of natural conditions and social economic status of Xiushan County, and the analyses of regional compartment and superimposition, the cultivated land was classified as 10 types according to the occurrences of drought and subsidence. Upon which, 40 transitional regions of the cultivated land in Xiushan County was marked up. The monitoring indexes of each gradation type area were obtained by plot sampling method. According to the published ＂agricultural land quality classification procedures＂, the calculated values of the monitored factors could designated the indices of the arable land use in 2014. [Conclusion] The average cultivated land of different gradational areas in Xiushan County was stable in 2014, including the quality difference among different gradational cultivated land, the average grade along transitional regions and the acreage changing into other gradational types.