珠三角主菜区土壤交换性钙、镁的丰缺指标及分布特征  

Enrichment-Deficient Index and Distribution of Soil Exchangeable Calcium and Magnesium in the Major Vegetable Production Areas of Pearl River Delta

作　　者：张白鸽[1] 陈琼贤[1] 曹健[1] 赫新洲[1] 杨秋[1] 高惠楠[1] 李强[2] 

机构地区：[1]广东省农业科学院蔬菜研究所,广东广州510640 [2]华南农业大学农学院,广东广州510642

出　　处：《华南农业大学学报》2011年第2期25-29,共5页Journal of South China Agricultural University

基　　金：广东省现代农业产业技术体系(粤农[2009]380号);广东省科技计划项目(2008B021000045;2009B020202003;2008A020100025)

摘　　要：在珠三角主菜区氮、磷、钾营养状况调查的基础上,从宏观上评价了珠三角主菜区交换性钙、镁分布情况,为有效提高钙镁肥增产效果奠定基础,同时也为珠三角主菜区＂中量元素营养＂及＂土壤中量元素＂管理提供依据.在珠三角主菜区,以菜心为供试蔬菜得出的土壤交换性钙丰缺指标如下：小于0.077 cmo·lkg-1为极度缺钙,0.78-3.78 cmo·lkg-1为缺钙,3.79-4.23 cmo·lkg-1为中度缺钙.土壤交换性镁丰缺指标如下：小于0.42 cmo·lkg-1为极度缺镁,0.43-1.44 cmo·lkg-1为缺镁,1.45-2.00 cmo·lkg-1为中度缺镁.调查表明,珠三角主菜区土壤普遍缺钙、镁,极度缺钙和缺钙菜田占到38%左右,极度缺镁和缺镁菜田占到88%左右,中度缺钙菜田在珠三角各个区域分布比例接近,均在20%左右.A macro scale survey was performed to investigate the content of exchangeable Ca and Mg,following with N,P,K nutrients,as well as its spatial distribution in the main vegetable production areas of the Pearl River Delta,which was a base for increasing fertilizer application efficiency and vegetable yield as well as for scientific strategy to manage mesne elements.In general,the sufficiency-deficient index of exchangeable Ca was less than 0.77,0.78-3.78 and 3.79-4.23 cmol·kg-1 for extreme Ca-deficient,Ca-deficient and medium Ca-deficient level respectively,the enrichment-deficient index of exchangeable Mg was less than 0.42,0.43-1.44 and 1.45-2.00 cmol·kg-1 for extreme Mg-deficient,Mg-deficient and medium-Mg deficient fertility,correspondingly.The investigation demonstrated that most of the vegetable growth areas in Pearl River Delta were in shortage of Ca and Mg nutrients.There was around 30% vegetable fields were in Ca deficiency,88% in Mg deficiency.Medium Ca-fertility vegetable fields took up approximately 20% of each area of the Pearl River Delta.

关 键 词：珠三角 主菜区 钙、镁分布 丰缺指标 

分 类 号：S151.9[农业科学—土壤学]