An Index System for Evaluation of Land Quality and Its Feasibility for Agri-E nvironment in Water Net Plain Area
Notice bibliographique
Résumé
The study on land resources in China and abroad since the 1970s ha s evolved into an important and comprehensive field of applied research in earth s ciences. This field encompasses the study of land quality evaluation, land types , land assessment, land productivity potential, land capacity to carry populatio n, land use and land cover, land planning, and land information system, etc. Dur ing the 1990s, a key focus of study has been the changes in land cover. More rec ently, in an attempt to better understand the changes in land quality, an intern ational collaborative project has been initiated to develop land quality index s ystems. Participating agencies include the World Bank, United Nations Food and A griculture Organization, United Nations Environment Program, United Nations Deve lopment Program, and the Ministry of Agriculture and Agri-Food of Canada. China has large population and relatively limited land, especially cultivated land. H owever, with the rapid development of industrialization and urbanization, the sc arcity of land resources and eco-environmental degradation resulted from unreas onable use of land have become more and more obvious in recent years. As a devel oping country, it's important to realize industrialization, urbanization and mod ernization in order to promote economic construction, improve people's living co nditions and keep the steps of developed countries. On other hand, for the susta inable development of economy and society, we should pay attention to the benefi ts of economy and environment nowadays, and deal well with the relations between the present and the future. Therefore, study on land quality evaluation in orde r to protect high quality cultivated land resources and allocate land resources optimally is significant both theoretically and practically. Under analysis of l and evaluation literatures home and abroad, and with an eye to features of the w ater net plain area, a new scientific kind of land quality evaluation index syst em for agricultural environment was built in this paper. 17 indexes including wa ter table height, Huanghai altitude and water net density and their formula were brought forward and established by balancing the weight of each index with an a id of the Expert-Analytical Hiberarchy Process. With support of the GIS technol ogy, evaluation units were decided by land resource types, and the classic evalu ation model named exponential sum was also adopted. The method was applied on Danghu Town of Pinghu City of Zhejiang Province of China and showed that is scie ntific, accurate and simple to operate. In addition, indexes of the index system , which are easy to gain, measure and compare, emphasize particularly on steady characteristic of geography and agrology correspondingly. So that it should be p opularized and utilized expediently and can provide scientific support for optim al allocation and rational utilization of land resources.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,004 | 0,006 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,012 | 0,012 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,003 | 0,003 |
| Science ouverte | 0,001 | 0,002 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,007 | 0,002 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».