A study on the spatial difference of farmland nitrogen nutrient budget in the Bohai Rim region, China

Auteur(s) et Affiliation(s)

GUO, L.

Inst. of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing, Chine

YANG, R.

Inst. of Geographic Sciences and Natural Resources Research, Beijing, Chine

WANG, D.

Inst. of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences (CAAS), Beijing, Chine

Description :
The AA. made use of the farmland nitrogen balance model to assess the spatial difference of farmland nitrogen nutrient budget in the Bohai Rim region in 2008 with the assistance of GIS. Their results indicated that: 1) Farmland in this region has a nitrogen surplus totaling 5.0822 million tons, or an average of 288.54 kg/ha. 2) In the Bohai Rim region, farmland nitrogen input and farmland nitrogen budget both show a spatial differentiation. Major grain-producing areas have a higher nitrogen input than that of the grazing-farming areas. Chemical fertilizer is the predominant source of nitrogen input to farmland. Therefore, this study provides scientific evidences for rationalizing the use of chemical fertilizer and managing agricultural operation on the regional scale and is also valuable for improving the economic and ecological efficiency of fertilizer use at the regional scale.

Type de document :
Article de périodique

Source :
Journal of geographical sciences. Acta geographica sinica, issn : 1009-637X, 2012, vol. 22, n°. 4, p. 761-768, nombre de pages : 8, Références bibliographiques : 19 ref.

Date :
2012

Editeur :
Pays édition : Chine

Langue :
Anglais