| Zhejiang Province is currently under the process of high-speed development of new patterns of urbanization and industrialization, which leads to significant contradiction between land supply and demand, and conflict between requisition and compensation of arable lands. Since low-slope hilly land is being considered to be an important source of reserved land resource, its comprehensive development and utilization would play an important role in strengthening the optimal allocation of land resources, relieving supply-demand contradiction of land, and balancing requisition with compensation of arable land.This article takes Ruian city in Zhejiang Province as an example, and obtains various attributes of low-slope hilly land including elevation, gradient, types of usage, vegetation coverage, soil type and geographic conditions by employing GIS technique, which, as a result, enables us to extract the information about exploitable low-slope hilly resources. By setting up an agricultural land suitability evaluation model and a constructional land suitability evaluation model, we would assess the appropriate usage of low-slope hilly resources. The evaluation results along with the government of Ruian’s actual comprehensive development and utilization plan of low-slope hilly resources provide Ruian government with guidance on utilizing low-slope hilly resource in a scientific way. The main results are shown as follow:(1) Evaluation results: The total area of low-slope hilly land in Ruian is22566.29ha, among which8545.30ha are exploitable. The results of agricultural land suitability evaluation show that804.49ha,1277.32ha,4196.01ha, and2267.48ha are good for arable land, arable&garden land, garden&forest land, and forest land, respectively. According to the result of constructional land suitability evaluation,1579.66ha are suitable as constructional developing land, among which543.62ha are very suitable, and1036.04ha are moderately suitable. And6965.64ha of low-slope hilly land are not suitable for constructional developing. By the year of2020, we suggest that Ruian government develop2081.81ha of exploitable low-slope hilly land resources for arable land, among which804.49ha should be developed in the short run and1277.32ha in the medium/long run. The advice for constructional developing land is1579.66ha including short-term development of543.62ha and the medium/long-term development of1036.04ha. In addition, there are forty-six key blocks for arable land development with a total area of688.09ha, and seven key blocks for constructional development with a area of481.68ha in total. This research plan would serve as an effective guidance for Ruian governement on comprehensive development and utilization of low-slope hilly resources in the next few years.(2) Evaluation the research methods: This study employs GIS technique and other various materials in order to extract the information about the range of low-slope hilly resources, and then constructs a database in which the gradient, elevation, land usage, soil type, location, vegetation coverage and other attributes of each block is available. Then we build suitability evaluation models by selecting various factors that related to the suitability of low-slope hilly resources. Next according to the evaluation results, we are able to propose the plan of developing low-slope hilly resources. This research achieves the goal of evaluating low-slope hilly resources at the county level and it has characteristics of evaluating in a macro and fast way. After field investigation, results of this study are confirmed to be feasible and practical. Therefore, this research method could serve as a guidance on evaluating low-slope hilly resource development at either city or province level in the future. |
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