Discussion on the Unified Survey and Evaluation of Cultivated Land Quality at County Scale for China’s 3rd National Land Survey: A Case Study of Wen County, Henan Province

Abstract

Under the task requirements of China’s 3rd national land survey on the grade determination of cultivated land, research on a reasonable and unified survey and evaluation system of cultivated land quality (CLQ) is of great importance. From the three dimensions of agricultural climate, production potential, and health status components of cultivated land, six factors are selected in this study to construct a set of simple, practicable, and operable county-level CLQ survey and evaluation system. These factors are climate conditions of cultivated land, soil characteristics, tillage conditions, the attributes of cultivated land type, environmental conditions, and biological activity. The developed survey and evaluation system meets the demands of national engineering for the inclusion and coordination of multiple departments based on the current evaluation system and evaluation methodology of all relevant land administrative departments. Wen County, Henan Province is used for field verification and evaluation. Results demonstrate that the average quality index of cultivated land in Wen County is 2196.33, ranging from 660.70 to 2802.96 with the largest area of the first-class and second-class land accounting for 20.98% and 52.61% of the county’s cultivated land, respectively; the third-class and fourth-class land, 12.63% and 13.78%. The obvious regional differentiation characteristics are presented along the boundary of Qingfengling with the quality of northern cultivated land higher than that in the south. The comparison with the results of the national utilization gradation in 2018 infers that they are in accordance with the distribution of CLQ, which bears a significant positive correlation trend with the measured grain output of the field. The constructed evaluation system serves as a rewarding attempt of a unified survey and evaluation of CLQ at the county scale to reflect the production capacity of local crops, realize the sharing of data platforms, save manpower and capital investment, improve the practical connection of supervision and management of cultivated land protection in different departments, and meet the requirements of current cultivated land protection and management.

Impacts of Farming Layer Constructions on Cultivated Land Quality under the Cultivated Land Balance Policy

“…Evaluations of agricultural production capacity, cultivated land potential, sustainability, grading, etc., are commonly used to assess CLQ [55][56][57]. Although different evaluation factors affect the quality of cultivated land at the same time, it does not mean that the CLQ index is acquired by their simple addition because some factors have a limiting effect [44].…”

Identifying Urban Wetlands through Remote Sensing Scene Classification Using Deep Learning: A Case Study of Shenzhen, China

“…In this study, the classification system referenced is the latest classification system of China's 3rd National Land Survey [42], which is extensively different from the previous classification system of the national wetland survey; the new system is regarded as a necessary for future wetland surveys and monitoring. On this basis, we conducted a field survey of urban wetlands in Shenzhen in September 2021 and photographed and recorded the type, location, vegetation, and other attributes of 18 typical locations (Figure 2b).…”

The Differentiation in Cultivated Land Quality between Modern Agricultural Areas and Traditional Agricultural Areas: Evidence from Northeast China

“…CLQ is then the primary attribute of cultivated land that reflects its comprehensive function [60]. Although many scholars have discussed CLQ from different perspectives, there is still no consensus regarding its concept [31,36,53,61]. Generally, CLQ has been defined as the ability to meet agricultural production's sustainable output and quality safety [35,62].…”